MV-S102867-00
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88PG8x7 Family Field Programmable SwitcherMHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Advance Datasheet, Patent Pending
Doc. MV-S102867-00, Rev. October 2007
88PG8x7 MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Document Status
Advance Information Preliminary Information Final Information Revision Code: Advance This document contains design specifications initial product development. Specifications change without notice. Contact Marvell Field Application Engineers more information. This document contains preliminary data, revision this document will published later date. Specifications change without notice. Contact Marvell Field Application Engineers more information. This document contains specifications product that final release. Specifications change without notice. Contact Marvell Field Application Engineers more information. Rev. Technical Publication: 0.31
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
VERVIEW
88PG8x7 family intelligent digital synchronous Step-Down (Buck) switching regulators with on-chip Low-Drop-Out (LDO) regulator controllers housed QFN-16 package. Internally self-compensated, these step-down regulators require external compensation work with low-ESR output capacitors simplify design, minimize board space, reduce amount external components. switching frequency step-down regulator MHz, allowing profile surface mount inductors value capacitors. stepdown regulator includes programmable output voltage provide user ability easily output voltage with external resistors, logic control, serial data interface. output voltage range 0.72V 3.63V. regulator controller with external P-Channel MOSFET forms dropout regulator capable driving output current. output voltage regulator fixed. "Ordering Information" section more details. Other features 88PG8x7 family include soft start auto power MOSFET detection regulator controller, internal current limit step-down regulator, undervoltage lockout, thermal shutdown, over voltage protection, Power-On Reset (POR) signal.
0.047 100k ILIM FDC642P
EATURES
Tiny QFN-16 package Switching frequency quiescent current (typ.) Stable with ceramic output capacitors external compensation required Over efficiency Peak switch current limit 4.5A Input voltage range: 2.75V 5.5V Serial Logic Programmability VoltageTechnology provides output voltage selections provide flexibility Programmable output voltage range: 0.72V 3.63V P-Channel regulator controller with programmable current limit Lead-free Packages Built-in undervoltage lockout Over voltage protection Thermal shutdown protection Output voltage margining capability
PPLICATION
10uF/6.3V SGND 1.3uH 22uF/6.3V
Portable computing Disk drive power supplies 3.3V Express
Vout2 3.3V/400mA (See Figure
SHDN VSET PSET
88PG847B
Vout1 0.8V/3A
22uF/6.3V
PVIN
SVIN
PGND
22uF/6.3V
22uF/6.3V
0.1uF
Figure Typical High Efficiency 0.8V/3A Step-Down Regulator
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Doc. MV-S102867-00, Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Table Contents
SECTION
SIGNAL DESCRIPTION
Configuration Type Definitions Description
SECTION
ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings Recommended Operating Conditions Electrical Characteristics.14 Switching Step-down Regulator Regulator Controller
SECTION
3.1.1
FUNCTIONAL DESCRIPTION
Digital Soft Start.
Regulation Start-up.18 Output Voltage Setting.21
3.2.1 3.2.2 3.2.3 Serial Programmability Logic Programmability Output Voltage AnyVoltageTechnology
Programmable Current Limit Regulator Controller
3.3.1 Maximum Output Current.
Undervoltage Lockout (UVLO) Over Voltage Protection (OVP).28 Power-On Reset (POR).29 Thermal Shutdown Adaptive Transient Response Using Ceramic Input Capacitors
3.10 Sequential Power 3.11 Disable Function.34
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SECTION
FUNCTIONAL CHARACTERISTICS
Start-up Waveforms Short-Circuit Waveforms. Switching Waveforms. Load Transient Waveforms
4.4.1 4.4.2 Step-Down Regulator Regulator
Output Voltage Transient Waveforms.
4.5.1 Step-Down Regulator
Line Transient Waveforms
SECTION
5.1.1
TYPICAL CHARACTERISTICS
Efficiency Graphs scale
Efficiency Graphs Load Regulation Dropout Voltage (ON) Resistance. Case Inductor Temperature P-Channel MOSFET (FDS642P) Thermal Characteristics Input Voltage Graphs.
5.7.1 5.7.2 Step-Down Regulator Regulator
Temperature Graphs.
5.8.1 5.8.2 Step-Down Regulator Regulator
SECTION
6.1.1
APPLICATIONS INFORMATION
Board Layout Examples 88PG8x7
Board Layout Considerations Guidelines 88PG8x7 Bill materials 88PG8x7
SECTION
MECHANICAL DRAWING
88PG8x7 Mechanical Drawing Dimensions. Typical Layout Dimensions
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
7.3.1
Recommended Solder Layout.
SECTION
ORDERING INFORMATION
Ordering Part Numbers Package Markings Sample Ordering Part Number Package Marking
8.3.1 Sample Package Marking Locations
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List Tables
Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Product Selector Table Type Definitions Description Default Value Data Field Voltage Percentage Output Voltage Setting Voltage Programming Table Resistors Voltage Programming Table Resistors Output Voltage Option Steps.25 P-Channel MOSFET Selection.26 88PG847 88PG837 88PG827 88PG817 88PG807 Option Ceramic Capacitor Cross Reference.64 88PG8x7 Ordering Part Numbers
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
List Figures
Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Typical High Efficiency 0.8V/3A Step-Down Regulator 88PG8x7 Family QFN-16 Package View 88PG8x7 Block Diagram. Output Voltage Window Soft Startup Soft Startup Inductor Current Steps Startup First Switching Cycle. Serial Programmability. Startup Sequence Soft Startup Maximum Output Current FDS642P P-Channel MOSFET. UVLO Waveforms Power-On Reset Waveforms Adaptive Transient Response Inrush with Ceramic Inrush with Ceramic Start-Up Waveforms 88PG847 devices Power Sequence 88PG8x7 devices. 88PG847B device without Output Startup Using Shutdown Turn Using Shutdown Startup Sequence Soft Startup UVLO Thresholds. Step-Down Short-Circuit Response Short-Circuit Response Switching Waveforms mode Switching Waveforms mode Switching Waveforms Mode Switching Waveforms Mode-Zoom. Output Ripple Voltage Fast Load Rise Time Slow Load Rise Time Fast Load Fall Time Slow Load Fall Time Load Transient Response Double-Pulsed Load Response Load Transient Response Double-Pulsed Load Response
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Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure
Load Transient Response VOUT 1.0V 1.2V with Load VOUT 1.0V 1.5V with Load VOUT 1.0V 1.2V with ILOAD VOUT 1.0V 1.2V with ILOAD VOUT 1.2V 1.0V with ILOAD VOUT 1.5V 1.0V with ILOAD Line Transient Line Transient Simplified Schematic 88PG8x7 Board Schematic Silk-Screen, Traces, Vias Copper (Not scale). Bottom Silk Screen, Bottom Trace, Vias, Bottom Copper (Not scale) Sample Part Number 88PG847 Package Marking Location
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Table provides information about other devices from same product family.
Table
Product Selector Table Peak 4.5A 3.0A 2.5A 1.5A 0.75A Loading 3.0A 2.0A 1.6A 1.0A 0.5A
Part 88PG847x 88PG837x 88PG827x 88PG817x 88PG807x
devices listed Table have same input output voltage range step-down regulator.
Section Signal Description
Configuration
Figure 88PG8x7 Family QFN-16 Package View
PSET VSET SGND
ILIM
SHDN
SVIN
PGND
PVIN
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Signal Description
Type Definitions
Type Definitions
Table
Type Definitions
Input only Output only Supply Connected Ground
Description
Table provides descriptions 88PG8x7. Table
Description
ILIM
Current-Limit Sense Regulator built-in offset (typical) between SVIN ILIM conjunction with sense resistor used current-limit threshold regulator controller. Connecting this SVIN disables internal current limit circuitry. When controller used, must left floating, must connected GND, connect ILIM VIN. This will reduce supply current. Regulator Controller Driver Connect gate external P-channel MOSFET. external P-Channel MOSFET needs have threshold -2.5V -1.8V input capacitance (Ciss) less than 1000 When controller used, must left floating, must connected GND, connect ILIM VIN. This will reduce supply current. Switching Regulator Feedback Senses output voltage switching regulator. Connect Ground This must connected ground. Switch Node Internal power MOSFET drain. This must connect external inductor. Power Ground power ground must connect negative terminal input output capacitors.
PGND
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Table
Description (Continued)
PVIN
Power Input Voltage Internal power MOSFET source. Connect decoupling capacitors between PVIN PGND position close possible Signal Input Voltage input voltage 2.75V 5.5V internal circuitry. Connect decoupling capacitor between SVIN SGND position close possible Power-On Reset Power-On Reset open drain output indicate status output voltage. output goes high after output voltage within specified tolerance. Shutdown Logic high 2.0V) disables switching step-down regulator regulator controller. shutdown, switch node step-down regulator high impedance. Logic 0.8V) enables step-down switching regulator regulator controller. high signal least disable both regulators. Serial Data Input: input data into this used program output voltage (see section 3.2). This must connected ground used. Signal ground: This must connect power ground. Voltage This used selecting output voltage level, when connected SGND SVIN conjunction with PSET connection SGND SVIN. Connect external resistor ground output voltage step-down switching regulator. "Electrical Characteristics" table resistor values Output Voltage Setting section. total capacitance across this SGND should equal less. resistors with tolerance better. Percent This used selecting output voltage level when connected SGND SVIN conjunction with VSET connection SGND SVIN. Connect external resistor ground output voltage step-down switching regulator. "Electrical Characteristics" table resistor values Output Voltage Setting section. resistor value with tolerance better. Regulator Controller Feedback Sense output voltage regulator. Connect drain P-channel MOSFET. When controller used, must left floating, must connected GND, connect ILIM SVIN. This will reduce supply current.
SVIN
SHDN
SGND VSET
PSET
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Electrical Specifications
Absolute Maximum Ratings
Section Electrical Specifications
Absolute Maximum Ratings1
Signal Input Voltage SGND PGND Power Input Voltage SGND PGND Switch Voltage SGND PGND Switching Regulator Feedback Voltage SGND PGND Voltage SGND PGND Percentage Voltage SGND=PGND Current Limit Voltage SGND=PGND Regulator Controller Driver Voltage SGND=PGND Regulator Controller Feedback Voltage SGND=PGND Shutdown Voltage SGND PGND Voltage SGND PGND Voltage SGND PGND Operating Temperature Range2 Maximum Junction Temperature Storage Temperature Range Rating3 Symbol SVIN PVIN VSFB VVSET VPSET VILIM VLDR VLFB VSHDN VPOR VSDI TJMAX TSTOR Range -0.3 -0.3 -0.3 (SVIN +0.3) -0.3 (SVIN +0.3) -0.3 (SVIN +0.3) -0.3 (SVIN +0.3) -0.3 (SVIN +0.3) -0.3 (SVIN +0.3) -0.3 (SVIN +0.3) -0.3 (SVIN +0.3) -0.3 (SVIN +0.3) -0.3 (SVIN +0.3)
Exceeding absolute maximum rating damage device Specifications over operating temperature ranges assured design, characterization correlation with statistical process controls Devices sensitive. Handling precautions recommended. Human body model, series with
Recommended Operating Conditions1
Signal Input Voltage Power Input Voltage Package Thermal Resistance2 Symbol SVIN PVIN
This device guaranteed function outside specified operating range Test 4-layer (JESD51-7) vias (JESD51-5) board
Range 2.75 2.75
°C/W °C/W
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Electrical Characteristics
following applies unless otherwise noted: SVIN PVIN VVSET VPSET 5.0V, VOUT 1.5V, VSHDN SGND PGND, (BUCK) COUT (BUCK) (Ceramic), PFET= FDC642P, COUT (LDO) (Ceramic), Bold values indicate
Signal Input Voltage Range Power Input Voltage Range Total Quiescent Current
SVIN PVIN
SVIN PVIN
2.75 2.75
load, with load, Without LDO, VLIM PVIN, VLDR Float, VLFB
Shutdown Supply Current Undervoltage Lockout
ISVIN VUVLO
VSHDN SVIN 5.0V High threshold, SVIN increasing threshold, SVIN decreasing
2.65 2.55
2.70 2.60
Over-voltage Protection
VOVP
High threshold, SVIN increasing threshold, SVIN decreasing
Shutdown Threshold Voltage
VSHDN
Enable regulators Disable regulators
Shutdown Input Current
ISHDN
VSHDN 5.0V VSHDN
Over-temperature Thermal Shutdown
TOTS
increasing (Disable regulators) decreasing (Enable regulators)
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Electrical Specifications
Switching Step-down Regulator
Switching Step-down Regulator
following applies unless otherwise noted: SVIN PVIN VVSET VPSET 5.0V, VOUT 1.5V, VSHDN SGND PGND, COUT (Ceramic), Bold values indicate
Output Voltage
RVSET 11K, mode VVSET SGND, VPSET SGND, mode RVSET 18.7K, mode VVSET SGND, VPSET SVIN, mode RVSET 31.6K, mode VVSET SVIN, VPSET SGND, mode RVSET 53.6K, mode VVSET SVIN, VPSET SVIN, mode RVSET 97.6K, mode RVSET 165K, mode RVSET 280K, mode RVSET 475K, mode
-7.5 -2.5 0.10 0.10
Percentage
RPSET RPSET 18.7K RPSET 31.6K RPSET 53.6K RPSET 97.6K RPSET 165K RPSET 280K RPSET 475K
Output Voltage Line Regulation Output Voltage Load Regulation
VLNREG
SVIN PVIN 3.0V 5.0V VOUT 1.5V ILOAD IOUT(MAX)/4 SVIN PVIN 5.0V VOUT 1.5V ILOAD IOUT(MAX)/4 IOUT(MAX) mode
VLDREG
Switching Frequency
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Doc. MV-S102867-00 Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Switching Step-down Regulator (Continued)
following applies unless otherwise noted: SVIN PVIN VVSET VPSET 5.0V, VOUT 1.5V, VSHDN SGND PGND, COUT (Ceramic), Bold values indicate
Minimum Peak Switch Current Limit
ILIM
88PG847 88PG837 88PG827 88PG817 88PG807
0.75
Output Current
IOUT
88PG847 88PG837 88PG827 88PG817 88PG807
VOUT* VOUT130
Switch Leakage Current
ILSW
SVIN PVIN VSHDN 5.0V SVIN PVIN VSHDN 5.0V
Power-On Reset Threshold Voltage
VPORTH
VOUT 1.35V VOUT 1.32V
Power-On Reset Output Voltage Power-On Reset Leakage Current Power-On Reset Delay
VPORL IPOR tRESET
ISINK VSHDN SGND PGND VSHDN 5.0V
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Electrical Specifications
Regulator Controller
Regulator Controller
following applies unless otherwise noted: SVIN PVIN 5.0V, VSHDN SGND PGND, PFET= FDC642P, COUT (LDO) Bold values indicate
88PG8X7B Output Voltage 88PG8X7E Output Voltage Output Voltage
VOUT VOUT
ILOAD ILOAD Room Temp, ILOAD Over Temp, ILOAD
Line Regulation
VLNREG
SVIN PVIN 3.5V 5.0V, VOUT 3.3V, ILOAD SVIN PVIN 5.0V, VOUT 3.3V, ILOAD SVIN-VILIM
Load Regulation
VLDREG
Current-Limit Threshold
VILTH
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Section Functional Description
Figure 88PG8x7 Block Diagram
2.75V 5.5V
SVIN
INTERNAL CIRCUITRY POWER SUPPLY
PVIN
UVLO OSCILLATOR CURRENT LIMIT Enable
ILIM
Controller
SHDN
Vout2
ANALOGDIGITAL CONVERTER Serial Data Interface CONTROL
PGND
Vout
BAND-GAP VOLTAGE REFERENCE
THERMAL SHUTDOWN 150°C FAULT UNDERVOLTAGE LOCKOUT RESISTOR NETWORK PGood UVLO RESISTOR SENSING CIRCUITRY 25us/40ms
VPOR
Enable
SGND
VSET
PSET
Regulation Start-up
step-down switching regulator uses Pulse Width Modulation (PWM) Pulse Frequency Modulation (PFM) modes regulate output voltage using digital control. mode operation depends level output current output voltage. steady states, step-down switching regulator monitors current flowing through inductor determine regulator handling heavy light load applications. heavy load applications, step-down regulator operates mode minimize ripple current optimum efficiency minimize ripple output voltage. step-down regulator operates Discontinuous Conduction Mode (DCM) limit switching actions optimum efficiency light load applications. this mode, average output voltage slightly higher than average output voltage heavy transient load applications.
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Functional Description
Regulation Start-up
Figure Output Voltage Window
Typical
Mode Mode Mode
3.1.1 Digital Soft Start
During start-up, 88PG8x7 provides soft start function. Soft start reduces surge currents from input voltage provides well-controlled output voltage rise characteristics. Figure shows that rise time 88PG8x7 increases from 0.8V output 3.3V output with load. Higher load current larger output capacitance will increase rise time. load current increased (1.1 ohms) Figure 3.3V output rise time nearly doubles with this load. 88PG8x7 internal switch current limit that operates cycle-by-cycle basis limits peak switch current. During soft start, current limit threshold begins approximately peak current limit threshold ramps 100% steps step (see Figure During switch first cycle, highside switch stays until switch current reaches first current limit threshold (see Figure which takes less than Then, high-side switch turns fixed off-time. output voltage still then current limit threshold increases next level. seen from Figure only current step required output reach 0.8V current steps 3.3V. During soft start, 88PG8x7 feeds relatively constant current output capacitor first steps. average switch current during this period approximately more then steps required, then switch current limit (ILIM) will need increase. output voltage rise time dependent value output capacitor, output voltage, load current (IOUT), internal switch current limit circuitry calculated using following equation.
Rise Time 3.3V -2.0A
72.6S
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Figure Soft Startup
(0.8V, 1.2V, 1.8V, 2.5V, 3.3V)
VOUT VBUCK mV/DIV
Figure Soft Startup
1V/DIV
IOUT
1A/DIV
s/DIV ILOAD COUT VOUT 3.3V ILOAD
s/DIV
Figure Inductor Current Steps Startup
Figure First Switching Cycle
VBUCK
1V/DIV
VOUT
2V/DIV
mV/DIV
IIND IIND 2A/DIV
1A/DIV
s/DIV ILOAD Heavy Load
ns/DIV
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Functional Description
Output Voltage Setting
Output Voltage Setting
3.2.1 Serial Programmability
output voltage step-down switching regulator also program using 18-bit serial data into pin.
Figure Serial Programmability
WRITE MODE
Start Chip Select Registor Address DATA FIELD Stop
Pulse
pulse Pulse pulse
Pulse
pulse pulse Pulse pulse
Pulse
period pulse VHIGH 2.4V VLow 0.8V
pulse write operation: Each write sequence needs pulses complete. During non-write operation, input needs VLOW (<0.8V). between successive write operations, input needs VLOW (<0.8V) minimum
VHIGH
VLOW
pulse, high 0.75 period 0.25 s+/-50 pulse Write sequence least Write sequence
VLOW
VHIGH
pulse, high 0.25 period 0.75 s+/-150
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
first bits (MSB-bits) data field used select output voltage where second bits (LSB-bits) data field used trim output voltage (percent output voltage). default value data field follows: Table Default Value Data Field Data Field Description Bits Default Value Voltage
Percent
power output voltage according VPSET VVSET. output voltage then field programmed setting "1". output voltage percent selected according Table
Table
Voltage Percentage Data Field
Data Field
Perce
-10% -7.5% -5.0% -2.5% +2.5% +5.0% +7.5% +10%
Bits
Value
combinations VSET (Table used with combinations PSET (Table provide maximum flexibility output voltage selection (Table
3.2.2 Logic Programmability
output voltage step-down switching regulator programmed connecting VSET PSET pins SGND and/or SVIN. This very useful standard output voltages. This method will eliminate external resistor output voltage. Table VSET
SGND SGND SVIN SVIN SGND
Output Voltage Setting PSET
SGND SVIN SGND SVIN RPSET<
0.8V 1.0V 1.2V 1.5V Hi-Z
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Functional Description
Output Voltage Setting
3.2.3 Output Voltage AnyVoltageTechnology
output voltage step-down switching regulator programmed using Table Table select resistor values VSET PSET pin. VSET sets output voltage PSET trims voltage percentage value. example, program 2.25V output, resistor selected VSET pin, resistor selected PSET pin. resistor sets output voltage 2.5V resistor trims voltage -10%. Using VSET resistor's value greater than less than 7.68 disables step-down switching regulator sets high impedance. VSET resistor's value outside tolerance, output either higher lower than voltage. Using resistor values greater than less than 7.68 PSET does affect voltage. When PSET used, must connected ground. Like VSET resistor, percent value either higher lower PSET resistor's value outside tolerance.
Table
Voltage Programming Table Resistors PSET -10.0% -7.5%
0.740 0.925 1.110 1.388 1.665 2.313 2.775 3.053
-5.0%
0.760 0.950 1.140 1.425 1.710 2.375 2.850 3.135
-2.5%
0.780 0.975 1.170 1.463 1.755 2.438 2.925 3.218
0.800 1.000 1.200 1.500 1.800 2.500 3.000 3.300
7.6k
0.820 1.025 1.230 1.538 1.845 2.563 3.075 3.383
0.840 1.050 1.260 1.575 1.890 2.625 3.150 3.465
7.5%
0.860 1.075 1.290 1.613 1.935 2.688 3.225 3.548
0.880 1.100 1.320 1.650 1.980 2.750 3.300 3.630
VSET
0.720 0.900 1.080 1.350 1.620 2.250 2.700 2.970
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Table
Voltage Programming Table Resistors PSET -10.0% -7.5%
0.740 0.925 1.110 1.388 1.665 2.313 2.775 3.053
-5.0%
0.760 0.950 1.140 1.425 1.710 2.375 2.850 3.135
-2.5%
0.780 0.975 1.170 1.463 1.755 2.438 2.925 3.218
0.800 1.000 1.200 1.500 1.800 2.500 3.000 3.300
2.5%
0.820 1.025 1.230 1.538 1.845 2.563 3.075 3.383
5.0%
0.840 1.050 1.260 1.575 1.890 2.625 3.150 3.465
7.5%
0.860 1.075 1.290 1.613 1.935 2.688 3.225 3.548
0.880 1.100 1.320 1.650 1.980 2.750 3.300 3.630
VSET
0.720 0.900 1.080 1.350 1.620 2.250 2.700 2.970
VSET PSET resistors read once during start-up before output voltage turned After output voltage turned output voltage change different values using serial programming interface. Otherwise configure output different voltage, power recycle 88PG8x7 turn back using shutdown pin. Figure shows startup waveforms 88PG8x7. Once input voltage (VIN) above under voltage lockout (UVLO) upper threshold (UTH), VSET PSET become active. Current first sourced PSET then VSET pin, exponentially increasing steps. After each step there blanking time before VSET voltage compared internal 1.2V reference. VSET voltage below internal reference voltage, current source proceeds next step. Once VSET voltage above internal reference voltage sequence stops output voltage (VOUT) allowed turn Figure shows VSET waveform VSET 2.5V PSET output. 88PG8x7 keeps track many steps required determine appropriate output voltage. Table provides number steps necessary each output voltage option. Using VSET resistor requires current source step times, PSET resistor 31.6 requires steps.
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Functional Description
Output Voltage Setting
Figure Startup Sequence
Figure Soft Startup
VOUT VVSET VPSET
2V/DIV VVSET 1V/DIV 500mV/DIV
1V/DIV
VPSET
500mV/DIV
1V/DIV
ms/DIV
s/DIV
Table
Output Voltage Option Steps VOUT
VSET
97.6 53.6 31.6 18.7
PSET
+7.5 +5.0 +2.5 -2.5 -5.0 -7.5
PSET
97.6 53.6 31.6 18.7
88PG8x7 provides innovative technique output voltage. During start-up reads value external resistors, which located outside regulator's feedback loop program output voltage. placing output voltage programming resistor outside regulator's feedback loop, tolerance does affect accuracy output voltage. Normally, adjustable regulators resistors output voltage. However, these resistors located inside feedback loop, introducing much initial accuracy error output voltage, resulting overall initial accuracy Whereas, 88PG8x7 initial accuracy eight output voltages. VSET PSET pins sensitive excessive leakage currents stray capacitance. output voltage potentially programmed lower output voltage there contamination, which introduces excessive leakage current VSET PSET pin, especially 3.3V output +10%. parasitic resistance these nodes must greater than stray capacitance must less than otherwise, 3.3V output potentially
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Programmable Current Limit Regulator Controller
sense resistor placed between SVIN ILIM program current limit regulator controller. following equation used determine value sense resistor.
50mV Typical SENSE
When regulator controller current limit, internal current-limit circuitry turns regulator controller holds regulator controller state (typical hold time). After hold-time expired, regulator controller enabled. current-limit circuitry continues disable enable regulator until current limit removed. regulator P-channel MOSFET selected from following list based required threshold voltage either -2.5V -1.8V gate capacitance less than 1000
Table Pack
P-Channel MOSFET Selection Vish child FDC642P FDC634P FDN340P FDN302P Si4433DY FDS9431A FDJ127P FDP4020P Si3443DV FDG330P Si2333DS Si5473DC Si1039X Si1012R/X
Super SOT-6 Super SOT-3 micro SO-8 SC75-6 FLMP TO-263AB (D2-Pack) TSOP-6 SC70-6 SOT-23 1206-8 Chip SC-89 (6-lead) SC75A/SC-89 (3-lead)
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Functional Description
Undervoltage Lockout (UVLO)
3.3.1 Maximum Output Current
FDS642P design provide continuous output current. However, tiny Super SOT-6 package dissipate 0.7W. input output voltage close, then full achieved, Figure input voltage increases, dissipates more power, limiting maximum output current. output current decrease order keep power dissipation under 0.7W limit.
Figure Maximum Output Current FDS642P P-Channel MOSFET
Maximum Output Current Input Voltage
Input Voltage 3.3V 88PG8x7B 2.5V 88PG8x7E
Undervoltage Lockout (UVLO)
start-up, 88PG8x7 incorporates undervoltage-lockout circuitry enable step-down switching regulator controller when input voltage above 2.65V (typical). After 88PG8x7 enabled input voltage lowered, highest value minimum input voltage both regulators remain enabled 2.55V (typical).
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Load Current
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Over Voltage Protection (OVP)
88PG8x7 incorporates over voltage protection circuitry disable step-down switching regulator controller when input voltage above 5.7V (typical). step-down switching regulator controller enabled when input voltage below 5.6V (typical).
Figure UVLO Waveforms
VOVP_HTH VOVP-LTH
VUVLO-HTH VUVLO-LTH
BUCK Output Enable BUCK Output Disable Output Enable Output Disable Undefined Undefined
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Functional Description
Power-On Reset (POR)
Power-On Reset (POR)
Power-On Reset (POR) active-high, open-drain output pin. This output held when output voltage step-down regulator below threshold. When output voltage above threshold, Power-On Reset goes high later. Setting output voltage greater than 1.35V, threshold voltage 0.9% VOUT (typical). Setting output voltage less than 1.32V, threshold voltage VOUT (typical). built-in (tDELAY) delay incorporated prevent nuisance tripping.
Figure Power-On Reset Waveforms
POOD_TH
DELAY
DELAY
PORH
PORL
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Thermal Shutdown
When junction temperature 88PG8x7 exceeds (typical), thermal shutdown circuitry disables step-down regulator. step-down switching regulator enabled when junction temperature decreased (typical).
Adaptive Transient Response
88PG8x7 device's Smart Technology allows step-down switching regulator quickly respond multiple step loads maintain stability over wide range applications. Figure shows example second step-load applied while output voltage step-down switching regulator increased inductive kick from first step-load. Condition: 5.0V, RSVIN CSVIN CPVIN COUT VOUT 1.2V, ILOAD
Figure Adaptive Transient Response
VOUT
100mV/DIV
ILOAD
2A/DIV
s/DIV
worst case overshoot (VSOAR) during full-load light-load transient stored inductor energy (Figure calculated
SOAR
LOAD
Although VSOAR cannot eliminated, amplitude controlled based COUT capacitor value. appropriate COUT value easily calculated acceptable VSOAR level each specific application.
LOAD SOAR
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Functional Description
Using Ceramic Input Capacitors
Using Ceramic Input Capacitors
Ceramic capacitors' ESR, small case size high ripple current ratings make them ideal switching regulator applications. However, Tantalum electrolytic capacitors must placed parallel with ceramic capacitors "Hot-Plug" application such when using AC-DC wall adaptor. wall adaptor "Hot-Plugged" into input supply, high transient current runs through adaptor's long wires produce ringing input (VIN) 88PG8x7, Figure During this period, 88PG8x7 still "OFF" current used charge input capacitor. worst, these voltage spikes high twice input voltage. dampen ringing, small Tantalum capacitor with range must added, shown Figure
Figure Inrush with Ceramic
Figure Inrush with Ceramic
2V/DIV
2V/DIV
5A/DIV
5A/DIV
s/DIV
s/DIV
Ceramic input capacitor must replaced with other type capacitor choose only dielectric. These have best voltage temperature characteristics. type capacitor placed parallel with input capacitor long Ceramic input capacitor placed next Tantalum input capacitor used, must rated switching regulator applications operating voltage derated 50%.
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
3.10 Sequential Power
Figure shows detailed start-up sequence waveforms 88PG847 devices cascaded together shown Figure When input voltage above under-voltage-lockout upper threshold (UVLO UTH) 2.65V, output (VOUT1) starts slow ramp finishes about Roughly, after input voltage above UVLO 2.5V (VOUT2) output ramps power-on-reset (POR) signal goes high after VOUT1 VOUT2 outputs regulating. signal enables 1.5V output (VOUT3) ramps later.
Figure Start-Up Waveforms 88PG847 devices
VOUT1
2V/DIV
2V/DIV VOUT2 1V/DIV VOUT3 1V/DIV
ms/DIV
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Functional Description
Sequential Power
Figure Power Sequence 88PG8x7 devices
0.047 100k 165k ILIM 10uF/6.3V SGND SVIN PGND 1.3uH 22uF/6.3V FDC642P
Vout1 3.3V
SHDN VSET PSET
88PG847B
Vout2 2.5V/3A
22uF/6.3V
PVIN
22uF/6.3V
22uF/6.3V
0.1uF
100k
100k
ILIM
SGND 1.3uH 22uF/6.3V
SHDN VSET PSET
88PG847B
Vout3 1.5V/3A
2N7002 53.6k
22uF/6.3V
PVIN
SVIN
PGND
22uF/6.3V
22uF/6.3V
0.1uF
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
3.11 Disable Function
function disabled connecting ILIM SVIN pin, ground. Also, left floating, Figure Disabling function will lower no-load supply current from
Figure 88PG847B device without Output
100k
ILIM
SGND 1.3uH 22uF/6.3V
SHDN VSET PSET
88PG847B
Vout1 0.8V/3A
22uF/6.3V
PVIN
SVIN
PGND
22uF/6.3V
22uF/6.3V
0.1uF
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Functional Characteristics
Start-up Waveforms
Section Functional Characteristics
following applies unless otherwise noted: 25°C, RSVIN CSVIN CPVIN COUT PFET FDC642P, COUT (LDO)
(BUCK)
Start-up Waveforms
NOTE: When input voltage rises above UVLO's upper threshold, then there delay typ) before stepdown regulator's output voltage turns
Figure Startup Using Shutdown
Figure Turn Using Shutdown
VSHDN
2V/DIV VSHDN VLDO 2V/DIV
2V/DIV
VLDO VBUCK
2V/DIV VBUCK 1V/DIV 1V/DIV
ms/DIV 5.0V VLDO= 3.3V VBUCK= 1.2V ILOAD Load tDLY~ 5.0V VLDO= 3.3V VBUCK= 1.2V
ms/DIV ILOAD Load
Figure Startup Sequence
Figure Soft Startup
5V/DIV VLDO VBUCK VPOR 2V/DIV VLDO VBUCK VPOR 5V/DIV
2V/DIV
1V/DIV 5V/DIV
1V/DIV 5V/DIV
ms/DIV 5.0V VLDO= 3.3V VBUCK= 1.2V ILOAD Load 5.0V VLDO= 3.3V
ms/DIV VBUCK= 1.2V ILOAD Load
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MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Figure UVLO Thresholds
2V/DIV
VLDO VBUCK
2V/DIV
1V/DIV
ms/DIV 6.0V VLDO= 3.3V VBUCK= 1.0V ILOAD(BUCK) ILOAD(BUCK) VUVLO(HTH) 2.65V VUVLO(LTH)= 2.55V VOVP(HTH) 5.8V VOVP(LTH) 5.7V
Short-Circuit Waveforms
Figure Step-Down Short-Circuit Response Figure Short-Circuit Response
5V/DIV Switch turns VBUCK Peak-Current Limit IIND 5A/DIV Peak-Current Limit Short-Circuit mV/DIV Current Limit Turns 1A/DIV VLDO Short-Circuit 1V/DIV
s/DIV
ms/DIV
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Functional Characteristics
Switching Waveforms
Switching Waveforms
NOTE: repeatability measuring output ripple (VBUCK (P-P)) BUCK regulator, standard test procedure limits scope bandwidth uses coax cable with very short leads terminated into coax leads must routed away from switching node much possible.
Figure Switching Waveforms mode
5V/DIV IIND 2A/DIV VBUCK mV/DIV mV/DIV VBUCK IIND
Figure Switching Waveforms mode
5V/DIV
2A/DIV
mV/DIV
mV/DIV
ns/DIV 5.0V VBUCK= 1.2V IOUT 3.0A VOUT(P-P) (Note) VIN(P-P) IIND(P-P) 1.05A IIND(PK) 3.4A Freq 5.0V VBUCK= 1.2V IOUT 3.0A
ns/DIV VIN(P-P) IIND(P-P) 1.05A IIND(PK) 3.4A Freq
VOUT(P-P) (Note)
Figure Switching Waveforms Mode
Figure Switching Waveforms
Mode-Zoom
5V/DIV
5V/DIV
VBUCK IIND
mV/DIV
VBUCK
mV/DIV
1A/DIV
IIND
1A/DIV
s/DIV 5.0V VBUCK= 1.2V IOUT VOUT(P-P) (Note) IIND(PK) Freq 5.0V VBUCK= 1.2V IOUT
ns/DIV
Ringing Freq
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Figure Output Ripple Voltage
VBUCK
mV/DIV
ms/DIV 5.0V VBUCK= 1.2V IOUT 3.0A VOUT(P-P) (Note)
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Functional Characteristics
Load Transient Waveforms
Load Transient Waveforms
4.4.1 Step-Down Regulator
Figure Fast Load Rise Time Figure Slow Load Rise Time
VBUCK IIND ILOAD 2A/DIV IIND 2A/DIV IIND ILOAD 5V/DIV VBUCK mV/DIV IIND
5V/DIV
mV/DIV
2A/DIV 2A/DIV
s/DIV 5.0V VBUCK= 1.2V IOUT COUT tRISE 5.0V VBUCK= 1.2V IOUT
s/DIV COUT tRISE
Figure Fast Load Fall Time
Figure Slow Load Fall Time
VBUCK ILOAD IIND
5V/DIV mV/DIV VBUCK IIND 2A/DIV ILOAD 2A/DIV IIND 2A/DIV IIND mV/DIV 5V/DIV
2A/DIV
s/DIV 5.0V VBUCK= 1.2V IOUT COUT tFALL 5.0V VBUCK= 1.2V IOUT
s/DIV COUT tFALL
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MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Figure Load Transient Response
Figure Double-Pulsed Load Response
VBUCK
mV/DIV VBUCK mV/DIV
ILOAD
2A/DIV
ILOAD
2A/DIV
s/DIV 5.0V VBUCK= 1.2V COUT ILOAD tRISE tFALL 5.0V VBUCK= 1.2V
s/DIV ILOAD tRISE tFALL
COUT
Figure Load Transient Response
Figure Double-Pulsed Load Response
VBUCK
mV/DIV VBUCK mV/DIV
ILOAD
2A/DIV ILOAD 2A/DIV
s/DIV 5.0V VBUCK= 1.2V COUT ILOAD tRISE tFALL 5.0V VBUCK= 1.2V
s/DIV ILOAD tRISE tFALL
COUT
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Functional Characteristics
Load Transient Waveforms
4.4.2 Regulator
Figure Load Transient Response
VLDO
mV/DIV
ILOAD
mA/DIV
s/DIV 5.0V VLDO= 3.3V COUT ILOAD
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Output Voltage Transient Waveforms
following graphs show effect changing step-down regulator's output voltage using serial interface. Depending change step-size output voltage, output load, output capacitance, power-on reset de-asserts when changes output voltage occur beyond (typical) delay.
4.5.1 Step-Down Regulator
Figure VOUT 1.0V 1.2V with Load Figure VOUT 1.0V 1.5V with Load
VBUCK
mV/DIV
VBUCK
mV/DIV
VPOR
5V/DIV VPOR 5V/DIV 5V/DIV 5V/DIV
s/DIV 5.0V COUT= 1000 5.0V
s/DIV
COUT= +1000
Figure VOUT 1.0V 1.2V with ILOAD
Figure VOUT 1.0V 1.2V with ILOAD
VBUCK VBUCK VPOR mV/DIV
mV/DIV
5V/DIV
VPOR
5V/DIV
5V/DIV
5V/DIV
s/DIV 5.0V COUT= 1000 5.0V
s/DIV
COUT= +1000
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Functional Characteristics
Line Transient Waveforms
Figure VOUT 1.2V 1.0V with ILOAD
Figure VOUT 1.5V 1.0V with ILOAD
VBUCK VBUCK mV/DIV VPOR VPOR 5V/DIV 5V/DIV
mV/DIV
5V/DIV
5V/DIV
s/DIV
s/DIV
5.0V COUT= 22)+1000
5.0V COUT= 22)+1000
Line Transient Waveforms
Figure Line Transient Figure Line Transient
3.2V
3.6V
1V/DIV 4.1V 4.5V
1V/DIV
VBUCK
mV/DIV mV/DIV VBUCK
ms/DIV 3.6V CIN= VBUCK 1.2V ILOAD 4.5V CIN=
ms/DIV VBUCK 1.2V ILOAD
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Section Typical Characteristics
Efficiency Graphs
Efficiency Output Current 5.0V Efficiency
Efficiency 1.8V 1.5V 1.2V 1.0V 0.8V Output Current Efficiency Output Current 3.3V
Output Current 3.3V 3.0V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V
5.1.1 Efficiency Graphs scale
Efficiency Output Current 3.3V Efficiency 1.8V 0.01 1.5V 1.2V 1.0V 0.8V
Efficiency Output Current 5.0V Efficiency 0.01 3.3V 3.0V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V Output Current
Output Current
Load Regulation
Output Voltage Output Current Vout 1.5V 1.60
Output Voltage
1.55
1.50 3.3V 5.0V 1.40 Output Current
1.45
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Typical Characteristics
Dropout Voltage
Dropout Voltage
Step-Down Regulator Dropout Load Current 3.2, Vout 3.3V Buck Dropout Load Current(A)
Dropout(V) Regulator Dropout Load Current 3.3V, Vout 3.3V
85°C 25°C -40°C
0.15 0.05
85°C 25°C -40°C
Load Current(A)
(ON) Resistance
Resistance Temperature 0.095
Bottom Resistance Temperature
0.031
Resistance
Resistance
0.085
0.027
3.0V 4.0V 5.0V
0.075
0.023
0.065
0.055 Temperature (°C)
3.0V 4.0V 5.0V
0.019
0.015 Temperature
Resistance Input Voltage 0.095
Bottom Resistance Input Voltage
0.026
25°C 0.075
Resistance
Resistance
0.085
0.024
25°C
0.022
0.065
0.020
0.055 Input Voltage(V)
0.018 Input Voltage(V)
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Case Inductor Temperature
following data taken using square inch copper Actual results depend upon size proximity other heat emitting components.
Input Current Output Current 25°C 3.00 3.3V 3.0V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V
3.00 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V
Input Current Output Current 3.3V, 25°C
Input Current
Input Current
2.25
2.25
1.50
1.50
0.75
0.75
0.00 Output Current
0.00 Output Current
Case Temprature Output Current 25°C Temprature (°C)
Case Temprature Output Current 3.3V, 25°C Temprature (°C) 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V
3.3V 3.0V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V
Output Current
Output Current
Inductor Temprature Output Current 25°C 3.3V 3.0V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V
Inductor Temprature Output Current 3.3V, 25°C
Temprature (°C)
Temprature (°C)
Output Current
Output Current
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Typical Characteristics
P-Channel MOSFET (FDS642P) Thermal Characteristics
P-Channel MOSFET (FDS642P) Thermal Characteristics
following data taken using square inch Copper. Actual results depend upon size proximity other heat emitting components.
Temperature Output Current 3.3V 5.0V, Vout 2.5V, 25°C
Temperature Output Current Vout 4.0V 5.0V, 25°C
3.3V
Temperature (°C)
4.0V 5.0V
Temperature (°C)
5.0V
Output Current
Output Current
Power Loss Output Current 3.3V 5.0V, Vout 2.5V, 25°C 2.500 2.000 Power Loss 1.500 1.000 0.500 0.000 Output Current
3.3V
Power Loss Output Current Vout 4.0V 5.0V, 25°C 1.600 1.400 Power Loss 1.200 1.000 0.800 0.600 0.400 0.200 0.000 Output Current
4.0V 5.0V
5.0V
Input Current Output Current 3.3V 5.0V, Vout 2.5V, 25°C 0.900 0.800 0.700 0.600 0.500 0.400 0.300 0.200 0.100 0.000
0.900
3.3V
Input Current Output Current Vout 4.0V 5.0V, 25°C
0.800
Input Current
5.0V
0.700 0.600 0.500 0.400 0.300 0.200 0.100 0.000
4.0V =5.0V
Input Current
Output Current
Output Current
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88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Input Voltage Graphs
Supply Current Input Voltage
Supply Current Output Votlage
Supply Current (mA)
With PFet Without PFet
Supply Current (mA)
With PFet Without PFet
Input Voltage
Output Voltage
Load Load
5.0V Load Load
Shutdown Threshold Input Voltage Shutdown Treshold Enable Disable
Input Voltage
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Typical Characteristics
Input Voltage Graphs
5.7.1 Step-Down Regulator
Output Voltage Input Voltage 1.60
Efficiency Input Voltage 100%
Output Voltage
1.55
Efficiency
Input Voltage
1.50
1.45
1.40
Input Voltage
IOUT(BUCK)
VOUT(BUCK) 1.5V IOUT(BUCK) 1.5A
Load Regulation Input Voltage 0.40%
Frequency Input Voltage 1200
Load Regulation
0.00%
Frequency (kHz)
Input Voltage
0.20%
1100
1000
-0.20%
-0.40%
Input Voltage
VOUT(BUCK) 1.5V IOUT(BUCK)
VOUT(BUCK) 1.5V IOUT(BUCK) 1.5A
Average Output Current Limit Input Voltage
Current Limit
Input Voltage
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MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
5.7.2 Regulator
Output Voltage Input Voltage
Load Regulation Input Voltage 0.20%
Load Regulation
Output Voltage
0.10%
0.00%
-0.10%
Input Voltage
-0.20% 4.00
4.25
4.50 Input Voltage
4.75
5.00
IOUT(LDO)
VOUT(LDO) 3.3V IOUT(LDO)
Average Output Current Limit Input Voltage
Current Limit
Input Voltage
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Typical Characteristics
Temperature Graphs
Temperature Graphs
Supply Current Temperature
UVLO Temperature
Supply Current (mA)
UVLO
Temperature (°C)
Temperature (°C)
IOUT(BUCK) Load IOUT(LDO) Load
IOUT(BUCK)
Shutdown Threshold Temperature Shutdown Treshold
Disable Enable Temperature (°C)
VIN=
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MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
5.8.1 Step-Down Regulator
Output Voltage Temperature
Efficiency Temperature 100%
Output Voltage
1.55
Efficiency
Temperature (°C)
1.45
Temperature (°C)
5.0V IOUT(LDO)
5.0V VOUT(BUCK) 1.5V IOUT(BUCK) 1.5A
Load Regulation Temperature 0.20%
Line Regulation Temperature 0.20%
Load Regulation
Line Regulation
0.10%
0.10%
0.00%
0.00%
-0.10%
-0.10%
-0.20% Temperature (°C)
-0.20% Temperature (°C)
5.0V VOUT(BUCK) 1.5V IOUT(BUCK)
3.0V 5.0V VOUT(BUCK) 1.5V IOUT(BUCK) 1.5A
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Typical Characteristics
Temperature Graphs
Average Output Current Limit Temperature
Frequency Temperature 1000
Current Limit
Frequency (kHz)
Temperature (°C)
Temperature (°C)
5.0V IOUT(BUCK) 1.5A
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MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
5.8.2 Regulator
Load Regulation Temperature Output Voltage Temperature 3.40 Load Regulation 0.04%
Output Voltage
3.35
0.02%
3.30
0.00%
3.25
-0.02%
3.20 Temperature (°C)
-0.04% Temperature (°C)
5.0V IOUT(LDO)
5.0V VOUT(LDO) 3.3V IOUT(LDO)
Line Regulation Temperature 0.40% 2.00
Average Output Current Limit Temperature
Line Regulation
0.20% Current Limit Temperature (°C)
1.75
0.00%
1.50
-0.20%
1.25
-0.40%
1.00 Temperature (°C)
3.5V 5.0V VOUT(LDO) 3.3V IOUT(LDO)
5.0V
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Copyright 2007 Marvell October 2007, Advance
Applications Information
Board Layout Considerations Guidelines 88PG8x7
Section Applications Information
Board Layout Considerations Guidelines 88PG8x7
Warning want avoid noise abnormal operating behavior, follow these layout recommendations. This 2-layer board with ground plane routing layer. Copy routing layer Figure much possible place layer. ground plane Figure placed other layer. recommend Table through Table Contact factory where substitutions made. Review recommended solder layout notes page Make sure that place silk screen indicated location 88PG8x7 FDS742P, Figure Ensure that outside package outline. This visually inspect package orientation after assembly. replace Ceramic input capacitor with other type capacitor. type capacitor placed parallel with input capacitor long Ceramic input capacitor placed next Tantalum input capacitor used, must rated switching regulator applications operating voltage derated 50%. either type ceramic capacitors. type capacitor used, then must double recommended capacitance value. type capacitor placed parallel with output capacitor. Low-ESR capacitors like POSCAP from Sanyo replace Ceramic output capacitors long capacitor value same greater. Note that Ceramic capacitors provide lowest noise smallest foot print solution. planes ground, input outputs power maintain good voltage filtering keep power losses low. there enough space power plane input supply, then input supply trace must least inch wide. there enough space power plane output supplies, then place output close load possible with trace least inch wide. inductor first. input capacitor placement most critical proper operation. current circulating through input capacitor loop (LP1) square wave with rise fall times slew rates high A/µs (see Figure 50). these fast slew rates, stray inductance generate voltage spike high inch trace, VIND di/dt. Therefore, Ceramic input capacitor must place close possible PVIN PGND pins with short wide trace possible. Also, PVIN PGND traces must placed layer. This will isolate fast currents from interfering with analog ground plane. 88PG8x7 internal grounds, analog (SGND) power (PGND). analog ground ties noise sensitive signals (PSET, VSET, SVIN) while power ground ties higher current power paths. Noise analog ground cause problems with IC's internal control bias signals. this reason, separate analog power ground traces recommended. signal ground connected power ground point, which terminal output capacitor. Keep loop (LP2) small possible connect terminal output capacitor close terminal input capacitor. back-to-back placing bypass capacitors, shown Figure recommended best results.
Copyright 2007 Marvell October 2007, Advance Document Classification: Proprietary Information
Doc. MV-S102867-00 Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Keep switching node (SW) away from sensitive signal nodes, minimizing capacitive coupling effects. trace must cross node, cross right angle. route analog digital lines close proximity power supply especially node. this can't avoided, shield these lines with power plane placed between node signal lines. type solder paste recommended packages clean", difficulty cleaning flux residues from beneath package.
Figure Simplified Schematic
PSET PSET VSET VSET SVIN 0.1uF PVIN PGND SGND
Vout
Cout
Doc. MV-S102867-00 Rev. Page Document Classification: Proprietary Information
Copyright 2007 Marvell October 2007, Advance
Applications Information
Board Layout Considerations Guidelines 88PG8x7
Figure 88PG8x7 Board Schematic
FDC642P
Vout2
PSET
VSET
SGND
0.1uF
ILIM
88PG8x7
PGND
SHDN PVIN SVIN
100k
Vout1
2.75V 5.5V
Copyright 2007 Marvell October 2007, Advance Document Classification: Proprietary Information
Doc. MV-S102867-00 Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
6.1.1 Board Layout Examples 88PG8x7
Actual board size mil; Area 0.490 Inches. Total copper layers (Top Bottom) components layer
Figure Silk-Screen, Traces, Vias Copper (Not scale)
Actual board size Total copper layer
Connect ground plane board Connect output voltage plane board Connect input output voltage this point
Connect ground plane board
Connect input output voltage this point
Connect input output voltage this point
Connect BUCK output voltage plane board
Connect ground plane board
Connect input output voltage this point
Doc. MV-S102867-00 Rev. Page Document Classification: Proprietary Information
Copyright 2007 Marvell October 2007, Advance
Applications Information
Board Layout Considerations Guidelines 88PG8x7
Figure Bottom Silk Screen, Bottom Trace, Vias, Bottom Copper (Not scale)
Connect ground plane board
Connect ground plane board
Connect Connect ground plane board Connect SHDN Connect
Connect ground plane board
Connect ground plane board
Copyright 2007 Marvell October 2007, Advance Document Classification: Proprietary Information
Doc. MV-S102867-00 Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Bill materials 88PG8x7
following tables list components used with 88PG8x7. Table Item 88PG847 Panasonic-ECG ERJ-2GEJ103X Panasonic-ECG ERJ-2GEJ104X Manufacturer Marvell Semiconductor Toko Panasonic-ECG factu 88PG847x C1005X5R1A104K C2012X5R0J226MT C2012X5R0J226MT C2012X5R0J226MT C2012X5R0J226MT #A918BY-1R3M=P3 ERJ-2RKF10R0X Desc ription MHz, 4.5A Peak Current-Limit Step-Down Regulator with Regulator Controller 10%, X5R, 10V, 0402 Case Size, Ceramic 20%, X5R, 6.3V, 0805 Case Size, Ceramic 20%, X5R, 6.3V, 0805 Case Size, Ceramic 20%, X5R, 6.3V, 0805 Case Size, Ceramic 20%, X5R, 6.3V, 0805 Case Size, Ceramic 3.1A, 28.6 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size 1/16W, 0402 Case Size
Table Item
88PG837 anufacturer Marvell Semiconductor C1005X5R1A104K ufac Part 88PG837x MHz, 3.0A Peak Current-Limit Step-Down Regulator with Regulator Controller 10%, X5R, 10V, 0402 Case Size, Ceramic
Doc. MV-S102867-00 Rev. Page Document Classification: Proprietary Information
Copyright 2007 Marvell October 2007, Advance
Applications Information
Bill materials 88PG8x7
Table Item
88PG837 (Continued) Panasonic-ECG ERJ-2GEJ103X Panasonic-ECG ERJ-2GEJ104X Toko Panasonic-ECG C2012X5R0J226MT A918CY-2R0M=P3 ERJ-2RKF10R0X 20%, X5R, 6.3V, 0805 Case Size, Ceramic 2.47A, 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size 1/16W, 0402 Case Size anufacturer ufac Part C2012X5R0J226MT 20%, X5R, 6.3V, 0805 Case Size, Ceramic
Table Item
88PG827 Toko Panasonic-ECG C2012X5R0J226MT A918BCY-3R3M=P3 ERJ-2RKF10R0X 20%, X5R, 6.3V, 0805 Case Size, Ceramic 1.99A, 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size C2012X5R0J226MT 20%, X5R, 6.3V, 0805 Case Size, Ceramic Manu facturer Marvell Semiconductor ufac Part 88PG827x C1005X5R1A104K cription MHz, 2.5A Peak Current-Limit Step-Down Regulator with Regulator Controller 10%, X5R, 10V, 0402 Case Size, Ceramic
Copyright 2007 Marvell October 2007, Advance Document Classification: Proprietary Information
Doc. MV-S102867-00 Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Table Item
88PG827 (Continued) Panasonic-ECG ERJ-2GEJ103X Manu facturer Panasonic-ECG ufactu Part ERJ-2GEJ104X cription 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size 1/16W, 0402 Case Size
Table Item
88PG817 Panasonic-ECG ERJ-2GEJ103X Panasonic-ECG ERJ-2GEJ104X Toko Panasonic-ECG C2012X5R0J106MT A918BCY-4R7M=P3 ERJ-2RKF10R0X 20%, X5R, 6.3V, 0805 Case Size, Ceramic 1.59A, 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size 1/16W, 0402 Case Size C2012X5R0J106MT 20%, X5R, 6.3V, 0805 Case Size, Ceramic Manu facturer Marvell Semiconductor ufactu Part 88PG817x C1005X5R1A104K cription 1MHz, 1.5A Peak Current-Limit Step-Down Regulator with Regulator Controller 10%, X5R, 10V, 0402 Case Size, Ceramic
Doc. MV-S102867-00 Rev. Page Document Classification: Proprietary Information
Copyright 2007 Marvell October 2007, Advance
Applications Information
Bill materials 88PG8x7
Table
88PG807 actu Marvell Semiconductor ufac 88PG807x criptio MHz, 0.75A Peak Current-Limit StepDown Regulator with Regulator Controller 10%, X5R, 10V, 0402 Case Size, Ceramic
C1005X5R1A104K
C2012X5R0J106MT
20%, X5R, 6.3V, 0805 Case Size, Ceramic
Panasonic-ECG
C2012X5R0J106MT VLF3010AT-4R7MR70 ERJ-2RKF10R0X
20%, X5R, 6.3V, 0805 Case Size, Ceramic 0.7A, 1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size
Panasonic-ECG
ERJ-2GEJ104X
1/16W, 0402 Case Size Voltage Programming Table, 1/16W, 0402 Case Size
Panasonic-ECG
ERJ-2GEJ103X
1/16W, 0402 Case Size
Table Item
Option Manu facturer Fairchild Susumu Ltd. ufac Part FDC642P C2012X5R0J106MT RL1220T-R047-J cription PFET, 2.5V, SuperSOT-6 Package 20%, X5R, 6.3V, 0805 Case Size, Ceramic 0.047, 1/4W, 0805 Case Size
Copyright 2007 Marvell October 2007, Advance Document Classification: Proprietary Information
Doc. MV-S102867-00 Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Table
Ceramic Capacitor Cross Reference Manu factu Part Taiyo-Yuden Murata cription JMK212BJ226MG-T C2012X5R0J226MT GRM21BR60J226ME39L JMK212BJ106MG-T C2012X5R0J106MT GRM219R60J106KE190 LMK105 BJ104KV-F C1005X5R1A104K
Manu facturer
Taiyo-Yuden Murata
Taiyo-Yuden
Doc. MV-S102867-00 Rev. Page Document Classification: Proprietary Information
Copyright 2007 Marvell October 2007, Advance
Mechanical Drawing
88PG8x7 Mechanical Drawing
Section Mechanical Drawing
88PG8x7 Mechanical Drawing
Copyright 2007 Marvell October 2007, Advance Document Classification: Proprietary Information
Doc. MV-S102867-00 Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Dimensions
Symbol 0.30 -0.20 2.90 2.90 0.80 0.00 0.90 0.02 0.20 0.25 3.00 3.00 0.50 0.40 -0.50 0.15 0.10 0.10 0.012 -0.30 3.10 3.10 0.008 0.114 0.114 1.00 0.05 0.031 0.000 0.035 0.001 0.008 0.010 0.118 0.118 0.020 0.016 -0.020 0.006 0.004 0.004 0.012 0.122 0.122 0.039 0.002
Notes:
DIMENSIONS TOLERANCES CONFORM ASME Y14.5M-1994 DRAWINGS SCALE DIMENSIONS MILLIMETERS TERMINAL IDENTIFIER TERMINAL NUMBERING CONVENTION (0.5 LONGER THAN OTHER PINS (0.4
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Copyright 2007 Marvell October 2007, Advance
Mechanical Drawing
Typical Layout Dimensions
Typical Layout Dimensions
7.3.1 Recommended Solder Layout
0.65
Package Outline
0.50 2.20 3.30
0.25 0.55 2.20 3.30
QFN-16 Land Pattern (mm)
0.25
0.25
0.051 mils
0.148
Non-Solder Mask Defined Terminal Notes
Notes:
VIEW DRAWING SCALE DIMENSIONS MILLIMETERS OVERSIZE SOLDER MASK MILS OVER SIZE ANNULAR RING) 0.148 SOLDER MASK (SM) BETWEEN PADS TOLERANCE ±0.05 LONGER THAN OTHER PINS
Copyright 2007 Marvell October 2007, Advance Document Classification: Proprietary Information
Doc. MV-S102867-00 Rev. Page
88PG8x7
MHz, 4.5A Peak Current-Limit Step-Down Regulator with AnyVoltageTechnology
Section Ordering Information
Ordering Part Numbers Package Markings
Figure shows ordering part numbering scheme 88PG8x7 devices. Contact Marvell® FAEs sales representatives complete ordering information.
Figure Sample Part Number
88PG8X7
Part Number
88PG847 88PG837 88PG827 88PG817 88PG807 Output Voltage Options 3.3V 2.5V Custom Code
C000
Custom (optional)
Custom Code
Environmental
RoHS compliant RoHS compliant
Package Code
16-pin
Doc. MV-S102867-00, Rev. Page Document Classification: Proprietary Information
Copyright 2007 Marvell October 2007, Advance
Ordering Information
Sample Ordering Part Number
Sample Ordering Part Number
standard ordering part numbers respective solutions follows: Table 88PG8x7 Ordering Part Numbers1 bient atur Range
Mark eting Part Numbe 88PG847B-NAM1 88PG837B-NAM1 88PG827B-NAM1 88PG817B-NAM1 88PG807B-NAM1 88PG847E-NAM1 88PG837E-NAM1 88PG827E-NAM1 88PG817E-NAM1 88PG807E-NAM1
G47B G37B G27B G17B G07B G47E G37E G27E G17E G07E
3.3V 3.3V 3.3V 3.3V 3.3V 2.5V 2.5V 2.5V 2.5V 2.5V
QFN-16 QFN-16 QFN-16 QFN-16 QFN-16 QFN-16 QFN-16 QFN-16 QFN-16 QFN-16
Contact Marvell® details. Specifications over operating temperature range assured design, characterization correlation with statistical process controls. Package dimensions
Package Marking
8.3.1 Sample Package Marking Locations
Figure example package marking location 88PG847 part. Markings other variants similar.
Figure 88PG847 Package Marking Location
Marking Year, Work week, Assembly code Last digit year Work week Assembly code
MRVL G47B YWWP
location
Note: above example drawn scale. Locations markings approximate.
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Doc. MV-S102867-00, Rev. Page
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Worldwide Corporate Offices
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Worldwide Sales Offices
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Worldwide Sales Offices
Western Marvell First Avenue Sunnyvale, 94089, Tel: 1.408.222.2500 Fax: 1.408.752.9028 Sales Fax: 1.408.752.9029 Marvell 5400 Bayfront Plaza Santa Clara, 95054, Tel: 1.408.222.2500 Central Marvell 9600 North MoPac Drive, Suite #215 Austin, 78759, Tel: 1.512.343.0593 Fax: 1.512.340.9970 Eastern US/Canada Marvell Parlee Office Park Meeting House Road, Suite Chelmsford, 01824 Tel: 1.978.250.0588 Fax: 1.978.250.0589 Europe Marvell Marchmont Gate Boundary Hemel Hempstead Hertfordshire, United Kingdom Tel: 44.(0).1442.211668 Fax: 44.(0).1442.211543
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