AAT2603

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AAT2603
Total Power Solution Portable Applications
AAT2603 highly integrated power management solution handheld mobile systems. provides regulated voltages from single-cell Lithium-ion/polymer battery supply. outputs produced regulators; switching step-down regulators four low-dropout (LDO) regulators. Each voltage regulator independent enable pin. high efficiency step-down regulators fully integrated switch high fixed frequency. They automatically transition variable frequency operation light loads improved efficiency. DC-DC1 (Buck1) designed high output current dropout voltage (200mV 1.2A). DC-DC2 (Buck2) 600mA regulator with step dynamic output voltage capability. option allows output voltage DC-DC2 (Buck2) either 1.0V 1.3V with SELB2 logic pin. regulators LDO1 LDO2 supply 400mA load current with output voltages adjustable down 1.5V. regulators LDO3 LDO4 supply 200mA current provide good noise power supply rejection. LDO3 LDO4 have output voltages externally adjustable down 1.2V. AAT2603 available Pb-free thermally enhanced 28-pin TQFN44 package rated operation over -40°C +85°C temperature range.
Features
Range: 2.7V 5.5V Step-Down Regulators DC-DC1(Buck1): 1.2A, Dropout Voltage Externally Adjustable: VFBB1 0.6V VOUT Range: 0.6V VINB1 Fixed: VOUT 3.3V Factory Programmable Voltage Levels from 0.6V 4.0V DC-DC2(Buck2): 0.6A, Dropout Voltage Externally Adjustable: VFBB2 0.6V VOUT Range: 0.6V VINB2 Fixed: VOUT 1.0V[SELB2='0']/1.3V[SELB2='1'] Factory Programmable Voltage Levels from 0.6V 4.0V Fixed 1.5MHz Switching Frequency Internally Compensated Current Mode Control High Efficiency over Entire Load Range Four Regulators LDO1: 400mA LDO2: 400mA LDO3: 200mA, Noise LDO4: 200mA, Noise Fast Turn-On Turn-Off time Short Circuit Over-Current Protection Over-Temperature Protection Temperature Range: -40°C +85°C TQFN44-28 Package
Applications
Handheld Handheld Instruments PDAs Handheld Computers Portable Media Players Smart Phones
2603.2008.06.1.0
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AAT2603
Total Power Solution Portable Applications
Typical Application Circuit
3.3H INB2 CINB2 4.7F CAIN 2.2F INL12 2.2F CINL34 2.2F ENB1 ENB2 SELB 10nF AGND PGND PGND2 OUTL4 OUTL4 4.7F 100k OUTL3 OUTL3 4.7F FBL3 100k 1.2V (Minimum): 200mA 1.2V (Minimum): 200mA OUTL1 OUTL1 4.7F 100k 1.5V (Minimum): 400mA 1.2H 1.0V 1.3V: 600mA COUTB2 3.3V: 1.2A OUTB1
2.7V 5.5V INB1 4.7F
INB1
AAT2603
OUTL2 OUTL2 4.7F 100k 1.5V (Minimum): 400mA
FBL4
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2603.2008.06.1.0
AAT2603
Total Power Solution Portable Applications
Descriptions
Symbol
ENB2 FBB2 ENL3 AGND FBL3 OUTL3 INL34 OUTL4 FBL4 ENL4 ENL1 FBL1 OUTL1 INL12 OUTL2 FBL2 ENL2 FBB1 ENB1 SELB2 PGND1 INB1 INB2 PGND2
Function
DC-DC2 (Buck2) switching node. Connect output inductor LX2. Connected internally drains both high-side low-side switches. DC-DC2 (Buck2) enable input. Active high. DC-DC2 (Buck2) feedback input. externally adjustable versions, connect resistor divider from Buck2 output FBB2 AGND Buck2 output voltage. LDO3 enable input. Active high. Analog ground. Connect AGND PGND1 PGND2 close possible device. LDO3 feedback input. Connect resistor divider from OUTL3 FBL3 AGND LDO3 output voltage. LDO3 output. Should closely decoupled AGND with 4.7F greater capacitor. LDO3 LDO4 input. Should closely decoupled AGND with 2.2F greater capacitor. LDO4 output. Should closely decoupled AGND with 4.7F greater capacitor. LDO4 feedback input. Connect resistor divider from OUTL4 FBL4 AGND LDO4 output voltage. LDO4 enable input. Active high. Reference Bypass. Bypass AGND with 0.01F greater capacitor reduce LDO1 output noise. LDO1 enable input. Active high. LDO1 feedback input. Connect resistor divider from OUTL1 FBL1 AGND LDO1 output voltage. LDO1 output. Should closely decoupled AGND with 4.7F greater capacitor. LDO1 LDO2 input. Should closely decoupled AGND with 2.2F greater capacitor. LDO2 output. Should closely decoupled AGND with 4.7F greater capacitor. LDO2 feedback input. Connect resistor divider from OUTL2 FBL2 AGND LDO2 output voltage. LDO2 enable input. Active high. Analog voltage input. bias supply device. Should closely decoupled AGND with 2.2F greater capacitor. DC-DC1 (Buck1) feedback input. externally adjustable versions, connect resistor divider from Buck1 output FBB1 AGND Buck1 output voltage. DC-DC1 (Buck1) enable input. Active high. Dynamically adjusts output voltage DC-DC2 (Buck2) (Logic High=1.3V, Logic Low=1.0V) DC-DC1 (Buck1) switching node. Connect output inductor LX1. Connected internally drains both high-side low-side switches. DC-DC1 (Buck1) power ground. Connected internally source Buck1 N-channel synchronous rectifier. Connect PGND1 PGND2 AGND close possible device. DC-DC1 (Buck1) power input. Connected internally source Buck1 P-channel switch. Should closely decoupled PGND1 with 4.7F greater capacitor. DC-DC2 (Buck2) power input. Connected internally source Buck2 P-channel switch. Should closely decoupled PGND2 with 4.7F greater capacitor. DC-DC2 (Buck2) power ground. Connected internally source Buck2 N-channel synchronous rectifier. Connect PGND2 PGND1 AGND close possible device. Exposed paddle (bottom). Connect ground close possible device.
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AAT2603
Total Power Solution Portable Applications
Configuration
TQFN44-28 (Top View)
ENB1 SELB2 PGND1 INB1 INB2 PGND2
ENB2 FBB2 ENL3 AGND FBL3 OUTL3
FBB1 ENL2 FBL2 OUTL2 INL12 OUTL1
FBL1 ENL1 ENL4 FBL4 OUTL4 INL34
Part Number Descriptions
Output Voltage1 Part Number
AAT2603INJ-1-T1 AAT2603INJ-2-T1 AAT2603INJ-3-T1 DC-DC1 (Buck1) Ext. Adj. (VFBB1 600mV) 3.3V Ext. Adj. (VFBB1 600mV) DC-DC2 (Buck2) (SELB2 Low) Ext. Adj. (VFBB2 600mV) 1.0V 1.0V DC-DC2 (Buck2) (SELB2 High) Ext. Adj. (VFBB2 775mV) 1.3V 1.3V LDOs Ext. Adj. (VFBLX 1.2V) Ext. Adj. (VFBLX 1.2V) Ext. Adj. (VFBLX 1.2V)
Absolute Maximum Ratings1
25°C unless otherwise noted. Symbol Description
INBX, INLXX, AGND ENBX, ENLX, FBBX, FBLX, AGND PGND1 PGND2 PGNDX AGND, PGND1 PGND2 Operating Temperature Range Storage Temperature Range Maximum Soldering Temperature leads, sec)
Value
-0.3 -0.3 VAIN+0.3 -0.3 VINB1+0.3 -0.3 VINB2+0.3 -0.3
Units
Recommended Operating Conditions
Symbol
Description
Thermal Resistance Maximum Power Dissipation
Value
Units
°C/W
Stresses above those listed Absolute Maximum Ratings cause permanent damage device. Functional operation conditions other than operating conditions specified implied. Only Absolute Maximum rating should applied time.
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2603.2008.06.1.0
AAT2603
Total Power Solution Portable Applications
Electrical Characteristics1
VAIN VINB1 VINB2 VINL12 VINL34 3.6V, CBYP 10nF, -40°C 85°C, unless noted otherwise. Typical values 25°C. Symbol Description Conditions
VENB1 VENL3 3.6V, Load VFBB1 VFBL3 3.6V VENx AGND rising falling Hysteresis
Units
Power Supply Input Voltage Range Quiescent Current ISHDN Input Shutdown Current UVLO Under-Voltage Lockout
-1.5 -2.5 -3.0 0.591 0.585 VINB1 +1.5 +2.5 +3.0 0.609 0.615
Oscillator Frequency FOSC tS,BYP Bypass Filter Startup Time VENB1 3.6V DC-DC1 (Buck1): 1.2A Step-Down Converter VOUT_RANGE Output Voltage Range 25°C, 20mA Load Output Voltage Accuracy VOUT_ACC -40°C 85°C, 20mA Load VOUT_TOL Output Voltage Tolerance 1.2A Load; 2.7V 5.5V 25°C, 20mA Load VFBB1_ACC Feedback Voltage Accuracy -40°C 85°C, 20mA Load VOUT/IOUT Load Regulation 1.2A Load VOUT/VIN Line Regulation 2.7V 5.5V ISHDN Shutdown Current VENB1 ILX_LEAK Leakage Current VINB1 5.5V, VLX1 VINB1 ILIM P-Channel Current Limit RDS(ON)H High Side Switch On-Resistance Side Switch On-Resistance RDS(ON)L Start-Up Time Enable Output Regulation DC-DC2 (Buck2): 600mA Step-Down Converter VOUT_RANGE Output Voltage Range 25°C, 20mA Load VOUT_ACC Output Voltage Accuracy 40°C 85°C, 20mA Load VOUT_TOL Output Voltage Tolerance 600mA Load; 2.7V 5.5V 25°C, 20mA Load Feedback Voltage Accuracy SELB2 -40°C 85°C, 20mA Load VFBB2_ACC 25°C, 20mA Load Feedback Voltage Accuracy SELB2 -40°C 85°C, 20mA Load VOUT/IOUT Load Regulation 600mA Load VOUT/VIN Line Regulation 2.7V 5.5V ISHDN Shutdown Current VENB2 ILX_LEAK Leakage Current VINB2 5.5V, VLX2 VINB2 ILIM P-Channel Current Limit High Side Switch On-Resistance RDS(ON)H RDS(ON)L Side Switch On-Resistance Start-Up Time Enable Output Regulation
-1.5 -2.5 -3.0 0.591 0.585 0.763 0.756 VINB2 +1.5 +2.5 +3.0 0.609 0.615 0.787 0.794
0.775 0.775
AAT2603 guaranteed meet performance specification from -40°C +85°C assured design, characterization correlation with statistical process controls.
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AAT2603
Total Power Solution Portable Applications
Electrical Characteristics1
VAIN VINB1 VINB2 VINL12 VINL34 3.6V, CBYP 10nF, -40°C 85°C, unless noted otherwise. Typical values 25°C. Symbol Description Conditions
0.08 400mA Load 10KHz, COUTL1,2 4.7F, 10mA Load VBYP already enabled; COUT 4.7F 1.182 1.17 1.164 0.02 200mA Load 10KHz, COUTL3,4 4.7F, 10mA Load Power 100~100KHz VBYP already enabled; COUT 4.7F 1.4V2 1500 1000
VINL12 1.218 1.23 1.236
Units
Vrms
400mA Regulators (LDO1, LDO2) VOUT_RANGE Output Voltage Range VFB_ACC VFB_TOL VOUT/IOUT VOUT/VIN IOUT(MAX) ILIM PSRR 200mA VOUT_RANGE VFB_ACC Feedback Voltage Accuracy Feedback Voltage Tolerance Load Regulation Line Regulation Maximum Output Current Output Current Limit Dropout Voltage Power Supply Rejection Ratio Start-Up Time Regulators (LDO3, LDO4) Output Voltage Range Feedback Voltage Accuracy 25°C, Load -40°C 85°C, Load 400mA Load, 2.7V 5.5V 400mA Load 3.3V 5.5V, 100mA Load
Feedback Voltage Tolerance VFB_TOL VOUT/IOUT Load Regulation VOUT/VIN Line Regulation IOUT(MAX) Maximum Output Current ILIM Output Current Limit Dropout Voltage PSRR Power Supply Rejection Ratio Output Noise Start-Up Time Logic Inputs/Outputs VEN(H) Input Logic High Voltage VEN(L) Input Logic Voltage Logic Input Current Thermal Over-Temperature Shutdown Threshold TSD(HYS) Over-Temperature Shutdown Hysteresis
25°C, Load -40°C +85°C, Load 200mA Load, 2.7V 5.5V 200mA Load 3.3V 5.5V, 100mA Load
VINL34 1.218 1.23 1.236
AAT2603 guaranteed meet performance specification from -40°C +85°C assured design, characterization correlation with statistical process controls. enable pins have internal 1.6M pull-down resistors.
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2603.2008.06.1.0
AAT2603
Total Power Solution Portable Applications
Typical Characteristics-DC-DC1 (Buck1)
Efficiency Output Current
(VOUTB1 3.3V; 3.3µH)
Load Regulation
(VOUTB1 3.3V; 3.3µH) Output Voltage Error
4.2V 3.6V
Efficiency
4.2V 3.6V
1000 10000
-0.2
-0.4
1000
10000
Output Current (mA)
Output Current (mA)
Line Regulation
(VOUTB1 3.3V; 3.3µH)
Output Voltage Error Temperature
(VOUTB1 3.3V; 4.2V) Output Voltage Error
IOUT 1.2A IOUT 600mA IOUT 300mA IOUT 100mA IOUT 10mA IOUT IOUT 0.1mA IOUT 1.2A IOUT 0.1mA
Output Voltage Error
-0.2
-0.2
-0.4
-0.4
Input Voltage
Temperature (°C)
P-Channel RDS(ON) Input Voltage
(VOUTB1 3.3V)
Load Transient
(VOUTB1 3.3V; 4.2V; IOUTB1 100mA 1200mA; 0pF)
P-Channel RDS(ON)
Output Voltage Coupled) (top)
Output Current (bottom)
-0.2 -0.4
120°C 100°C 85°C 25°C
Input Voltage
Time (100µs/div)
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AAT2603
Total Power Solution Portable Applications
Typical Characteristics-DC-DC1 (Buck1)
Load Transient
(VOUTB1 3.3V; 4.2V; IOUTB1 100mA 1200mA; 100pF)
Load Transient
(VOUTB1 3.3V; 4.2V; IOUTB1 600mA 1200mA; 0pF)
Output Voltage Coupled) (top)
Output Voltage Coupled) (top)
Output Current (bottom)
Output Current (bottom)
-0.1 -0.2
-0.1 -0.2
Time (100µs/div)
Time (50µs/div)
Load Transient
(VOUTB1 3.3V; 4.2V; IOUTB1 600mA 1200mA; 100pF)
Line Transient
(VOUTB1 3.3V; 4.2V IOUTB1 700mA) Output Voltage Coupled) (bottom)
Output Voltage Coupled) (top)
-0.1 -0.2
Input Voltage (top)
Output Current (bottom)
-0.1 -0.2
Time (50µs/div)
Time (100µs/div)
Soft-Start
(VOUTB1 3.3V; 4.2V; IOUTB1 1.2A)
Enable Voltage (top)
Output Voltage (bottom)
Time (100µs/div)
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AAT2603
Total Power Solution Portable Applications
Typical Characteristics-DC-DC2 (Buck2)
Efficiency Output Current
(VOUTB2 1.3V; 1.5µH)
Efficiency Output Current
(VOUTB2 1.2µH)
Efficiency
Efficiency
4.2V 3.6V 2.7V
1000
4.2V 3.6V 2.7V
1000
Output Current (mA)
Output Current (mA)
Load Regulation
(VOUTB2 1.3V; 1.5µH)
Load Regulation
(VOUTB2 1.2µH)
4.2V 3.6V 2.7V
Output Voltage Error
Output Voltage Error
4.2V 3.6V 2.7V
-0.2
-0.2
-0.4
1000
-0.4
1000
10000
Output Current (mA)
Output Current (mA)
Line Regulation
(VOUTB2 1.3V; 1.5µH)
Line Regulation
(VOUTB2 1.2µH) Output Voltage Error
IOUT 600mA IOUT 300mA IOUT 100mA IOUT 10mA IOUT IOUT 0.1mA IOUT 600mA IOUT 300mA IOUT 100mA IOUT 10mA IOUT IOUT 0.1mA
Output Voltage Error
-0.2 -0.4 -0.6
-0.2 -0.4 -0.6
Input Voltage
Input Voltage
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AAT2603
Total Power Solution Portable Applications
Typical Characteristics-DC-DC2 (Buck2)
Output Voltage Error Temperature
(VOUTB2 1.3V; 3.6V)
IOUT 600mA IOUT 0.1mA
Switching Frequency Input Voltage
(VOUTB2 1.3V; IOUTB2 600mA) Switching Frequency (MHz)
1.505 1.495 1.49 1.485 1.48 1.475 1.47 1.465 1.46
Output Voltage Error
-0.2 -0.4 -0.6
Temperature (°C)
Input Voltage
P-Channel RDS(ON) Input Voltage
(VOUTB2 1.3V)
0.05
Load Transient
(VOUTB2 1.3V; 3.6V; IOUTB2 100mA 600mA; 0pF)
P-Channel RDS(ON)
Output Voltage Coupled) (top)
-0.05 -0.1
Output Current (bottom)
120°C 100°C 85°C 25°C
Input Voltage
Time (50µs/div)
Load Transient
(VOUTB2 1.3V; 3.6V; IOUTB2 100mA 600mA; 100pF)
0.05
Load Transient
(VOUTB2 1.3V; 3.6V; IOUTB2 300mA 600mA; 0pF)
0.05
Output Voltage Coupled) (top)
Output Voltage Coupled) (top)
Output Current (bottom)
Output Current (bottom)
-0.05 -0.1
-0.05
Time (50µs/div)
Time (20µs/div)
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AAT2603
Total Power Solution Portable Applications
Typical Characteristics-DC-DC2 (Buck2)
Load Transient
(VOUTB2 1.3V; 3.6V; IOUTB2 300mA 600mA; 100pF)
0.05
Line Transient
(VOUTB2 1.3V; 4.2V; IOUTB2 300mA)
Output Voltage Coupled) (bottom)
0.25 0.15 0.05 -0.05 -0.1
Output Voltage Coupled) (top)
Input Voltage (top)
-0.05
Output Current (bottom)
Time (20µs/div)
Time (50µs/div)
Soft-Start
(VOUTB2 1.3V; 3.6V; IOUTB2 600mA)
Enable Voltage (top)
Output Voltage (bottom)
Time (100µs/div)
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AAT2603
Total Power Solution Portable Applications
Typical Characteristics-LDO1/LDO2
Load Regulation
(VOUTL1&2 3.6V)
Load Regulation
(VOUTL1&2 1.5V; 3.6V) Output Voltage Error
Output Voltage Error
-0.2
-0.2
-0.4
1000
-0.4
1000
Output Current (mA)
Output Current (mA)
Line Regulation
(VOUTL1&2 1.5)
Output Voltage Error Temperature
(VOUTL1&2 2.8V; 3.6V)
Output Voltage Error
IOUT 400mA IOUT 100mA IOUT 10mA IOUT IOUT 0.1mA
Output Voltage Error
-0.2
-0.2
IOUT 400mA IOUT 0.1mA
-0.4
-0.4
Input Voltage
Temperature (°C)
Load Transient
(VOUTL1&2 2.8V; 3.6V; IOUTL1&2 50mA)
0.04 0.02 0.05
Load Transient
(VOUTL1&2 2.8V; 3.6V; IOUTL1&2 200mA)
Output Voltage Coupled) (top)
-0.02 -0.04
Output Voltage Coupled) (top)
-0.05 -0.1 -0.2
Output Current (bottom)
Output Current (bottom)
0.05 -0.05
Time (100µs/div)
Time (100µs/div)
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AAT2603
Total Power Solution Portable Applications
Typical Characteristics-LDO1/LDO2
Load Transient
(VOUTL1&2 2.8V; 3.6V; IOUTL1&2 400mA)
Line Transient
(VOUTL1&2 2.8V; 4.2V; IOUTL1&2 400mA)
Output Voltage Coupled) (top)
Input Voltage (top)
Output Voltage (bottom)
Output Current (bottom)
-0.1 -0.2
-0.1 -0.2
Time (200µs/div)
Time (20µs/div)
Soft-Start
(VOUTL1&2 2.8V; 3.6V; IOUTL1&2 400mA)
Enable Voltage (top)
Output Voltage (bottom)
Time (500µs/div)
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AAT2603
Total Power Solution Portable Applications
Typical Characteristics-LDO3/LDO4
Load Regulation
(VOUTL3&4 3.6V)
Load Regulation
(VOUTL3&4 1.2V; 3.6V) Output Voltage Error
Output Voltage Error
-0.2
-0.2
-0.4 1000
-0.4 1000
Output Current (mA)
Output Current (mA)
Line Regulation
(VOUTL3&4 1.2V)
Output Voltage Error Temperature
(VOUTL3&4 2.8V; 3.6V) Output Voltage Error
IOUT 400mA IOUT 100mA IOUT 10mA IOUT IOUT 0.1mA
Output Voltage Error
-0.2
-0.2
IOUT 200mA IOUT 0.1mA
-0.4
-0.4
Input Voltage
Temperature (°C)
Load Transient
(VOUTL3&4 2.8V; 3.6V; IOUTL3&4 50mA)
0.01
Load Transient
(VOUTL3&4 2.8V; 3.6V; IOUTL3&4 100mA)
0.02
Output Voltage Coupled) (top)
Output Voltage Coupled) (top)
-0.01 -0.02
-0.02 -0.04
Output Current (bottom)
Output Current (bottom)
0.05
Time (100µs/div)
Time (100µs/div)
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2603.2008.06.1.0
AAT2603
Total Power Solution Portable Applications
Typical Characteristics-LDO3/LDO4
Load Transient
(VOUTL3&4 2.8V; 3.6V; IOUTL3&4 200mA)
0.05
Line Transient
(VOUTL3&4 2.8V; 4.2V; IOUTL3&4 200mA)
Output Voltage Coupled) (top)
Input Voltage Coupled) (top)
Output Voltage (bottom)
Output Current (bottom)
-0.05
0.15 0.05 -0.05 -0.1
Time (100µs/div)
Time (20µs/div)
Soft-Start
(VOUTL3&4 2.8V; 3.6V; IOUTL3&4 200mA)
Enable Voltage (top)
Output Voltage (bottom)
Time (500µs/div)
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AAT2603
Total Power Solution Portable Applications
Functional Block Diagram
ENB1 ENB2 OUTL SELB LDO1 Interface Support DC-DC2 (Buck2) PGND DC-DC1 (Buck1) PGND
OUTL LDO2 INL12
OUTL LDO3
INL34
OUTL LDO4 AGND
Functional Description
AAT2603 highly integrated voltage regulating power management unit mobile handsets other portable devices. includes switch-mode step-down converters (600mA [DC-DC2] 1.2A [DC-DC1]), four low-dropout (LDO) regulators (two: 200mA, two: 400mA). operates from input voltage between 2.7V 5.5V making ideal lithium-ion regulated power sources. converters have separate enable pins ease use.
2.7V 5.5V. output voltage range 0.6V VIN. high 1.5MHz switching frequency allows small external inductor capacitor. step-down converters offer soft-start limit current surge seen input eliminate output voltage overshoot. current across internal P-channel power switch sensed turns when current exceeds current limit. Also, thermal protection completely disables switching internal dissipation becomes excessive, thus protecting device from damage. junction over-temperature threshold 140°C with 15°C hysteresis. DC-DC1 (Buck1) designed peak continuous output current 1.2A. high-side power switch been designed with RDSON 145m allow minimum dropout voltage 174mV full load current.
Step-Down Converters
AAT2603 switch-mode, step-down converters constant frequency peak current mode converters with internal compensation. input voltage range
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2603.2008.06.1.0
AAT2603
Total Power Solution Portable Applications
designed maintain over efficiency maximum rated output current load 1.2A with 3.3V output. Peak efficiency above 95%. Buck1 excellent transient response, load line regulation. Transient response time typically less than 20s. peak input current limited 1.7A. DC-DC2 (Buck2) 600mA step-down regulator designed dynamically shift between output voltages toggling SELB2 pin. internal reference voltage buck regulator changed based position SELB2 pin. Buck2 designed maintain over efficiency maximum rated output current 600mA with 1.2V output. Peak efficiency above 90%. Buck2 excellent transient response, load line regulation. peak inductor current limited 1.3A. step-down converters AAT2603 have highly flexible output voltage programming capability. output voltages factory programmed preset output voltages external resistors. "Part Number Descriptions" table lists available voltage options step-down converters Buck1 Buck2. Option externally adjustable output voltages both step-down converters. dynamic voltage scaling Buck2 still useable with external feedback resistors. When SELB2 position feedback voltage compared 600mV reference, while when SELB2 high reference voltage 775mV. most other options, output voltages Buck2 factory programmed.
Application Information
DC-DC1/DC-DC2
step-down converter uses peak current mode control with slope compensation maintain stability duty cycles greater than 50%. output inductor value must selected inductor current down slope meets internal slope compensation requirements. Table displays suggested inductor values various output voltages. Manufacturer's specifications list both inductor current rating, which thermal limitation, peak current rating, which determined saturation characteristics. inductor should show appreciable saturation under normal load conditions. Some inductors meet peak average current ratings result excessive losses high DCR. Always consider losses associated with effect total converter efficiency when selecting inductor. recommended that inductor current rating exceed current limit step-down converter. Table example inductor values/vendors.
Input Capacitor
Select 4.7F ceramic capacitor input; Table suggested capacitor components. estimate required input capacitor size, determine acceptable input ripple level (VPP) solve (CINB1/CINB2). calculated value varies with input voltage maximum when double output voltage.
Regulators
AAT2603 includes four regulators. regulators operate from 2.7V 5.5V input voltage regulated output voltage. regulators have adjustable output voltages resistors. Each consumes 50uA quiescent current. 200mA regulators stable with small 4.7F ceramic output capacitor. 200mV dropout voltage 200mA load allows regulated output voltage approaching input voltage. output noise voltage high power supply rejection make these regulators ideal powering noise sensitive circuitry. 400mA regulators stable with small 4.7F ceramic output capacitor. 300mV dropout voltage 400mA load allows regulated output voltage approaching input voltage. These LDOs offer high power supply rejection.
CIN(MIN)
Always examine ceramic capacitor voltage coefficient characteristics when selecting proper value. example, capacitance 10F, 6.3V, ceramic capacitor with 5.0V applied actually about
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AAT2603
Size (mm) LxWxH
5x5.2x2.2
Total Power Solution Portable Applications
Manufacturer
Part Number/ Type
LTF5022
Inductance
Rated Current
2.35 2.03 2.45 2.35 1.95
(max)
(typ) (typ) (typ) (typ)
WE-TPC Type Wurth Electronik WE-TPC Type
4.8x4.8x1.8
4.8x4.8x2.8
Murata
LQH55D
5x5.7x4.7
Table Suggested Inductor Components.
Configuration
Adjustable Fixed Output Voltage
Output Voltage
1.2V, 1.3V 1.5V, 1.8V 2.5V 2.8V, 3.3V
Inductor Value
1.0H 1.2H 1.5H 1.8H 2.2H 2.7H 3.3H
input capacitor ripple current varies with input output voltage will always less than equal half total load current.
Table Inductor Values Specific Output Voltages.
0.52
maximum input capacitor current
IRMS
Part Number
0603ZD105K 0603ZD225K C1608X5R1E105K C1608X5R1C225K C1608X5R1A475K C2012X5R1A106K C3216X5R1A226K GRM188R61C105K GRM188R61A225K GRM219R61A106K GRM31CR71A226K LMK107BJ475KA
Manufacturer
Value
2.2F 2.2F 4.7F 2.2F 4.7F
Voltage
Temp.
Case
0603 0603
0805 1206 0603 0805 1206 0603
Murata Taiyo Yuden
Table Suggested Capacitor Components.
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IRMS(MAX)
term appears both input voltage ripple input capacitor current equations maximum when twice VIN. This input voltage ripple input capacitor current ripple maximum duty cycle.
output voltage droop load transient dominated capacitance ceramic output capacitor. During step increase load current, ceramic output capacitor alone supplies load current until loop responds. Within several switching cycles, loop responds inductor current increases match load current demand. relationship output voltage droop during several switching cycles output capacitance estimated
input capacitor provides impedance loop edges pulsed current drawn AAT2603 stepdown switching regulators. ESR/ESL ceramic capacitors ideal this function. minimize stray inductance, capacitor should placed closely possible This keeps high frequency content input current localized, minimizing input voltage ripple. laboratory test set-up typically consists long wires running from bench power supply evaluation board input voltage pins. inductance these wires, along with low-ESR ceramic input capacitor, create high network that affect converter performance. This problem often becomes apparent form excessive ringing output voltage during load transients. Errors loop phase gain measurements also result. Since inductance short trace feeding input voltage significantly lower than power leads from bench power supply, most applications exhibit this problem. applications where input power source lead inductance cannot reduced level that does affect converter performance, high tantalum aluminum electrolytic should placed parallel with ESR, bypass ceramic. This dampens high network stabilizes system.
COUT
ILOAD VDROOP
Once average inductor current increases load level, output voltage recovers. above equation establishes limit minimum value output capacitor with respect load transients. internal voltage loop compensation also limits minimum output capacitor value DC-DC2 DC-DC1. This effect loop crossover frequency (bandwidth), phase margin, gain margin. Increased output capacitance will reduce crossover frequency with greater phase margin. maximum output capacitor ripple current given
IRMS(MAX)
VOUT (VIN(MAX) VOUT) VIN(MAX)
Dissipation current ceramic output capacitor typically minimal, resulting less than degrees rise hot-spot temperature.
Feedback Resistor Selection
Resistors Figure program output regulate voltage higher than 0.6V. limit bias current required external feedback resistor string while maintaining good noise immunity, minimum suggested value 59k. Although larger value will further reduce quiescent current, will also increase impedance feedback node, making more sensitive external noise interference. Table summarizes resistor values various output voltages with either good noise immunity 221k reduced load input current.
Output Capacitor
output capacitor limits output ripple provides holdup during large load transitions. ceramic capacitor typically provides sufficient bulk capacitance stabilize output during large load transitions characteristics necessary output ripple. ceramic capacitor required DC-DC2 ceramic capacitor required DC-DC1; Table suggested capacitor components.
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AAT2603
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1.5V VOUT 0.6V 88.5k
AAT2603 step-down regulators, combined with external feedforward capacitor (CFF Figure deliver enhanced transient response extreme pulsed load applications.
VDC-DC1/VDC-DC2
Ceramic, tantalum, aluminum electrolytic capacitors selected CINL12/CINL34/CAIN. There specific capacitor requirement CINL12/CINL34/CAIN. However, 200mA/400mA regulators output operation, ceramic capacitors recommended CINL12/CINL34/CAIN their inherent capability over tantalum capacitors withstand input current surges from impedance sources such batteries portable devices.
Output Capacitor
proper load voltage regulation operational stability, capacitor required between pins VOUTLX AGND. COUTLX capacitor connection regulator ground should made direct practically possible maximum device performance. AAT2603 regulators have been specifically designed function with very ceramic capacitors. Although device intended operate with these capacitors, stable over very wide range capacitor ESR, thus will also work with higher tantalum aluminum electrolytic capacitors. However, best performance, ceramic capacitors recommended. Typical output capacitor values maximum output current conditions range from 4.7F 10F. desired, COUTLX increased without limit.
VFBB1/VFBB2
Figure AAT2603 DC-DC1/DC-DC2 External Resistor Output Voltage Programming.
29.4 39.2 49.9 59.0 68.1 78.7 88.7
VOUT
1.85
221kW
113K 150K 187K 221K 261K 301K 332K 442K 464K 523K 715K 1.00M
Bypass Capacitor Noise Applications
bypass capacitor provided enhance very noise characteristics AAT2603 LDO3 LDO4 regulators. bypass capacitor necessary operation AAT2603. However, best device performance, small ceramic capacitor should placed between bypass (BYP) device analog ground (AGND). value CBYP should 10nF. lowest noise best possible power supply ripple rejection performance 10nF capacitor should used. practically realize highest power supply ripple rejection lowest output noise performance, critical that capacitor connection between AGND direct traces should short possible. Refer Layout Recommendations section this datasheet examples.
Table Feedback Resistors DC-DC1 DC-DC2.
LDO1/LDO2/LDO3/LDO4
Input Capacitor
Typically, 2.2F larger capacitor recommended CINL12/CINL34/CAIN most applications. input capacitor should located close input (INL12/INL34/ AIN) device practically possible. CINL12/CINL34/ CAIN values greater than 2.2F will offer superior input line transient response will assist maximizing highest possible power supply ripple rejection.
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AAT2603
100k
8.25 16.5 24.9 33.2 41.2 49.9 66.5 82.5 90.9
Total Power Solution Portable Applications
There relationship between bypass capacitor value regulator turn-on time. applications where fast device turn-on time desired, value CBYP should reduced. applications where noise performance and/or ripple rejection less concern, bypass capacitor omitted. fastest device turn-on time will realized when bypass capacitor used. leakage this affect regulator output noise voltage regulation performance. this reason, leakage, high quality ceramic (NPO type) film capacitor highly recommended. VOUT
Feedback Resistor Selection
Resistors Figure program output regulate voltage higher than 1.5V LDO1/LDO2 1.2V LDO3/LDO4. limit bias current required external feedback resistor string while maintaining good noise immunity, minimum suggested value 100k. Although larger value will further reduce quiescent current, will also increase impedance feedback node, making more sensitive external noise interference. Tables summarize resistor values various output voltages with 100k.
Table Feedback Resistor Values LDO3 LDO4. 100k
24.9 33.2 41.2 49.9 66.5 82.5 90.9
1.5V VOUT 1.2V 100k 24.9k
VOUTLX
VOUT
VFBLX
Figure AAT2603 LDO1/LDO2/LDO3/LDO4 External Resistor Output Voltage Programming.
Table Feedback Resistor Values LDO1 LDO2.
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AAT2603
Total Power Solution Portable Applications
Thermal Calculations
There three types losses associated with AAT2603 total power management solution [two stepdown four regulators]: switching losses, conduction losses, quiescent current losses. Conduction losses associated with RDS(ON) characteristics internal power switches/FETs both stepdown regulators power loss associated with voltage difference across pass switch/FET four regulators. Switching losses dominated gate charge power output switching devices. full load, assuming continuous conduction mode (CCM), simplified form losses given following (quiescent switching losses ignored, since conduction losses dominant): Since RDS(ON) conduction losses vary with input voltage, dominant losses should investigated over complete input voltage range. Given total conduction losses, maximum junction temperature (125°C) derived from TQFN44-28 package which 50°C/W.
TJ(MAX) PTOTAL
TJ(MAX): PTOTAL: Maximum junction temperature Total conduction losses Thermal impedance package Ambient temperature
Layout
suggested layout AAT2603 shown Figures following guidelines should used help ensure proper layout. input capacitors (C1, C13, C16) should connect closely possible INB1 (Pin 26), INB2 (Pin 27), (Pin 20), INL12 (Pin 16), INL34 (Pin AGND/PGND1/PGND2 (Pins 27). C3/C18 (step-down regulator output capacitors) L1/L2 should connected closely possible. connection L1/L2 LX1/LX2 pins should short possible. feedback trace FBXX (Pins should separate from power trace connect closely possible load point. Sensing along high current load trace will degrade load regulation. external feedback resistors used, they should placed closely possible FBXX (Pins minimize length high impedance feedback trace. resistance trace from load return PGND1/PGND2 (Pins should kept minimum. This will help minimize error regulation differences potential internal signal ground power ground. good thermal coupling, vias required from TDFN44-28 exposed paddle ground plane.
PDC-DC1
IO12 (RDS(ON)H1 VOB1 RDS(ON)L1 [VINB1 VOB1]) VINB1 IO22 (RDS(ON)H2 VOB2 RDS(ON)L2 [VINB2 VOB2]) VINB2
PDC-DC2
PLDO1 ILDO1 (VINL12 VOL1) PLDO2 ILDO2 (VINL12 VOL2)
PLDO3 ILDO3 (VINL34 VOL3) PLDO4 ILDO4 (VINL34 VOL4) PTOTAL PDC_DC1 PDC_DC2 PLDO1 PLDO2 PLDO3 PLDO4
PDC-DCX: Power dissipation specific DC-DC regulator IOX: Output current specific DC-DC regulator RDS(ON)HX: Resistance internal high-side switch/FET RDS(ON)LX: Resistance internal low-side switch/FET VOBX: Output voltage specific DC-DC regulator VINBX: Input voltage specific DC-DC regulator PLDOX: Power dissipation specific regulator ILDOX: Output current specific regulator VINLXX: Input voltage specific regulator VOLX: Output voltage specific regulator PTOTAL: Total power dissipation AAT2603
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AAT2603
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OUTB1
3-Prong Header
3-Prong Header
ENL1
ENB1 SELB2 ENB1 AAT2603
INB2 PGND2
PGND1
INB1
SELB2
ENB1
3-Prong Header
3-Prong Header
ENB2
OUTB2 ENB2 ENL3
ENB2 FBB2 ENL3 AGND FBL3 OUTL3
OUTL4 INL34 ENL4 FBL4 ENL1 FBL1
FBB1 ENL2 FBL2 OUTL2 INL12 OUTL1
ENL2
ENL2
OUTL2
OUTL1
3-Prong Header
3-Prong Header ENL4
OUTL3
ENL3
ENL1 ENL4
OUTL4
3-Prong Header
SELB2
Figure AAT2603 Evaluation Board Schematic.
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AAT2603
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Figure AAT2603 Evaluation Board Side Layout.
Figure AAT2603 Evaluation Board Bottom Side Layout.
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Ordering Information
Output Voltage1 Package
TQFN44-28 TQFN44-28 TQFN44-28 DC-DC1 (Buck1) Ext. Adj. (VREF 600mV) 3.3V Ext. Adj. (VREF 600mV) DC-DC2 (Buck2) (SELB2 Low) Ext. Adj. (VVREF 600mV) 1.0V 1.0V DC-DC2 (Buck2) (SELB2 High) Ext. Adj. (VVREF= 775mV) 1.3V 1.3V
Marking2
3AXYY
Part Number (Tape Reel)3
AAT2603INJ-1-T1 AAT2603INJ-2-T1 AAT2603INJ-3-T1
AnalogicTech products offered Pb-free packaging. term "Pb-free" means semiconductor products that compliance with current RoHS standards, including requirement that lead exceed 0.1% weight homogeneous materials. more information, please visit website
Buck Buck output voltages factory programmed most common output voltages. Contact your local sales representative availability minimum order quantities. assembly date code. Sample stock generally held part numbers listed BOLD.
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AAT2603
Total Power Solution Portable Applications
Package Information
TQFN44-28
Marking Detail 2.600 0.050 C0.3
4.000 0.050
4.000 0.050
2.600 0.050
View
Bottom View
0.400 0.050
0.430 0.050
0.750 0.050 0.230 0.050 0.203 0.050 0.050
Side View
Indicator
Detail
leadless package family, which includes QFN, TQFN, DFN, TDFN STDFN, exposed copper (unplated) lead terminals manufacturing process. solder fillet exposed copper edge cannot guaranteed required ensure proper bottom solder connection.
Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, 95054 Phone (408) 737-4600 (408) 737-4611
Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility circuitry other than circuitry entirely embodied AnalogicTech product. circuit patent licenses, copyrights, mask work rights, other intellectual property rights implied. AnalogicTech reserves right make changes their products specifications discontinue product service without notice. Except provided AnalogicTech's terms conditions sale, AnalogicTech assumes liability whatsoever, AnalogicTech disclaims express implied warranty relating sale and/or AnalogicTech products including liability warranties relating fitness particular purpose, merchantability, infringement patent, copyright other intellectual property right. order minimize risks associated with customer's applications, adequate design operating safeguards must provided customer minimize inherent procedural hazards. Testing other quality control techniques utilized extent AnalogicTech deems necessary support this warranty. Specific testing parameters each device necessarily performed. AnalogicTech AnalogicTech logo trademarks Advanced Analogic Technologies Incorporated. other brand product names appearing this document registered trademarks trademarks their respective holders.
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AAT2603

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