MIC23150

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MIC23150
4MHz Buck Regulator with HyperLight Load
MIC23150 high efficiency 4MHz synchronous buck regulator with HyperLight Loadmode. HyperLight Loadprovides very high efficiency light loads ultra-fast transient response which perfectly suited supplying processor core voltages. additional benefit this proprietary architecture very output ripple voltage throughout entire load range with small output capacitors. tiny Thin MLF® package saves precious board space requires only three external components. MIC23150 designed with very small inductor, down 0.47µH, output capacitor small that enables total solution size, less than height. MIC23150 very quiescent current 23µA achieves peak efficiency continuous conduction mode. discontinuous conduction mode, MIC23150 achieve efficiency 1mA. MIC23150 available 8-pin Thin MLF® package with operating junction temperature range from -40°C +125°C. Datasheets support documentation found Micrel's site www.micrel.com.
Features
HyperLight LoadInput voltage: 2.7V 5.5V output current peak efficiency typical efficiency 23µA typical quiescent current 4MHz operation continuous mode Ultra fast transient response ripple output voltage 14mVpp ripple HyperLight Loadmode output voltage ripple full mode Fully integrated MOSFET switches 0.01µA shutdown current Thermal shutdown current limit protection Output Voltage 0.95V 8-pin Thin MLF® -40°C +125°C junction temperature range
Applications
Mobile handsets Portable media/MP3 players Portable navigation devices (GPS) WiFi/WiMax/WiBro modules Solid State Drives/Memory Wireless cards Portable applications
Typical Application
MIC23150
VOUT
Efficiency 1.8V
2.7V 3.0V 3.6V
ThinMLF
AGND PGND
1.0µH 4.7µF 1000 10000 OUTPUT CURRENT (mA)
HyperLight Load trademark Micrel, Inc. MicroLeadFrame registered trademark Amkor Technology Inc. Micrel Inc. 2180 Fortune Drive Jose, 95131 (408) 944-0800 (408) 474-1000 http://www.micrel.com
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Ordering Information
Part Number MIC23150-CYMT MIC23150-4YMT MIC23150-GYMT MIC23150-SYMT
Notes: Other options available (0.95V 3.6V). Contact Micrel Marketing details. Thin GREEN RoHS compliant package. Lead finish NiPdAu. Mold compound Halogen Free. Thin identifier.
Marking Code
Nominal Output Voltage 1.0V 1.2V 1.8V 3.3V
Junction Temp. Range -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C
Package 8-Pin Thin MLF® 8-Pin Thin MLF® 8-Pin Thin 8-Pin Thin
Lead Finish Pb-Free Pb-Free Pb-Free Pb-Free
Configuration
PGND AGND
(Top View) Thin (MT)
Description
Number Name AGND PGND Function Switch (Output): Internal power MOSFET output switches. Enable (Input): Logic high enables operation regulator. Logic will shut down device. leave floating. Sense: Connect VOUT close output capacitor possible sense output voltage. Analog Ground: Connect central ground point where high current paths meet (CIN, COUT, PGND) best operation. Input Voltage: Connect capacitor-to-ground decouple noise. Power Ground.
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Absolute Maximum Ratings(1)
Supply Voltage (VIN) Sense (VSNS). Output Switch Voltage (VSW) Enable Input Voltage (VEN). .-0.3V Storage Temperature Range .-65°C +150°C Rating(3) .2kV
Operating Ratings(2)
Supply Voltage (VIN). .2.7V 5.5V Enable Input Voltage (VEN) Junction Temperature Range (TJ). .-40°C +125°C Thermal Resistance Thin MLF-8 (JA) .90°C/W
Electrical Characteristics(4)
25°C; 3.6V; 1.0µH; COUT 4.7µF unless otherwise specified. Bold values indicate -40°C +125°C, unless noted.
Parameter Supply Voltage Range Under-Voltage Lockout Threshold Under-Voltage Lockout Hysteresis Quiescent Current Shutdown Current Output Voltage Accuracy Current Limit Output Voltage Line Regulation Output Voltage Load Regulation Switch ON-Resistance Switching Frequency SoftStart Time Enable Threshold Enable Input Current Over-temperature Shutdown Over-temperature Shutdown Hysteresis
Notes: Exceeding absolute maximum rating damage device. device guaranteed function outside operating rating. Devices sensitive. Handling precautions recommended. Human body model, 1.5k series with 100pF. Specification packaged product only.
Condition (turn-on) IOUT VOUT Nominal 5.5V 3.6V VOUTNOM 2.5V, ILOAD 20mA 4.5V VOUTNOM 2.5V, ILOAD 20mA 0.9*VOUTNOM 3.6V 5.5V VOUTNOM 2.5V, ILOAD 20mA 4.5V 5.5V VOUTNOM 2.5V, ILOAD 20mA 20mA ILOAD 500mA, 3.6V VOUTNOM 2.5V 20mA ILOAD 500mA, 5.0V VOUTNOM 2.5V 100mA PMOS -100mA NMOS IOUT 120mA VOUT Turn-On
2.45
2.55 0.01
2.65 +2.5
Units
-2.5 0.75 0.150 0.110
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Typical Characteristics
3.0V 2.7V
Efficiency 1.8V
3.6V
EFFICIENCY
Efficiency 3.3V
4.2V EFFICIENCY
Efficiency with Various Inductors
0.68µH 1.0µH
EFFICIENCY
1.5µH
2.2µH
4.2V 5.0V
5.5V
5.0V
5.5V
3.6V 1.8V
1.0µH COUT 4.7µF 1000 10000 OUTPUT CURRENT (mA)
1.0µH 4.7µF 1000 10000 OUTPUT CURRENT (mA)
COUT 4.7µF 1000 10000 OUTPUT CURRENT (mA)
QUIESCENT CURRENT (µA)
OUTPUT VOLTAGE
CURRENT LIMIT
Current Limit Input Voltage
Quiescent Current Input Voltage
1.95 1.85
Output Voltage Input Voltage
25°C 125°C
Load 200mA Load 600mA
-40°C
1.75 Load 1000mA Load 1500mA 1.65 INPUT VOLTAGE
1.0µH 4.7µF INPUT VOLTAGE
Switching open 1.2V INPUT VOLTAGE
OUTPUT VOLTAGE
1.85 1.75 1.65 INPUT VOLTAGE Load 10mA Load 100mA Load
3.6V
4.2V
OUTPUT VOLTAGE
1.95
SWITCHING FREQUENCY (MHz)
Output Voltage Input Voltage
Switching Frequency Output Current
3.0V
1.88
Output Voltage Output Current
5.5V 1.86 4.2V 3.6V 1.84 1.82 1.78
1.0µH 1.8V
2.7V
0.01
0.001
4.7µF
1000 10000 OUTPUT CURRENT (mA)
1.76 1.0µH 1.74 1.8V 1.72 4.7µF 1000 10000 OUTPUT CURRENT (mA)
Switching Frequency Temperature
SWITCHING FREQUENCY (MHz) 3.6V =1.0µH 4.7µF LOAD 120mA OUTPUT VOLTAGE 1.85 1.84 1.83 1.82 1.81 1.80 1.79 1.78
Output Voltage Temperature
ENABLE THRESHOLD
Enable Thresold Temperature
ENABLE
2.7V 3.6V 5.5V
ENABLE
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
February 2009
M9999-082908-A
=1.0µH 1.77 4.7µF 1.76 LOAD 120mA 1.75
1.0µH COUT 4.7µF
Micrel Inc.
MIC23150
Functional Characteristics
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Functional Characteristics (cont.)
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Functional Characteristics (cont.)
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Functional Diagram
UVLO CONTROL LOGIC Timer Softstart Gate Drive
Reference
Current Limit ERROR COMPARATOR ZERO ISENSE PGND
AGND
Figure Simplified MIC23150 Functional Block Diagram
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Functional Description
input supply (VIN) provides power internal MOSFETs switch mode regulator along with internal control circuitry. operating range 2.7V 5.5V input capacitor, with minimum voltage rating 6.3V, recommended. high switching speed, minimum 2.2µF bypass capacitor placed close power ground (PGND) required. Refer layout recommendations details. logic high signal enable activates output voltage device. logic signal enable deactivates output reduces supply current 0.01µA. MIC23150 features built-in soft-start circuitry that reduces in-rush current prevents output voltage from overshooting start leave floating. switch (SW) connects directly inductor provides current path during switching cycles. other inductor connected load, output capacitor. high speed switching this pin, switch node should routed away from sensitive nodes whenever possible.
sense (SNS) connected output device provide feedback control circuitry. connection should placed close output capacitor. Refer layout recommendations more details. AGND analog ground (AGND) ground path biasing control circuitry. current loop signal ground should separate from power ground (PGND) loop. Refer layout recommendations more details. PGND power ground ground path high current mode. current loop power ground should small possible separate from analog ground (AGND) loop applicable. Refer layout recommendations more details.
February 2009
M9999-082908-A
Micrel Inc.
MIC23150 inductance. Ensure inductor selected handle maximum operating current. When saturation current specified, make sure that there enough margin that peak current does cause inductor saturate. Peak current calculated follows:
VOUT /VIN PEAK IOUT VOUT
Application Information
MIC23150 high performance DC-to-DC step down regulator offering small solution size. Supporting output current inside tiny Thin MLF® package, requires only three external components while meeting today's miniature portable electronic device needs. Using HyperLight Loadswitching scheme, MIC23150 able maintain high efficiency throughout entire load range while providing ultra-fast load transient response. following sections provide additional device application information. Input Capacitor 2.2µF ceramic capacitor greater should placed close PGND bypassing. C1608X5R0J475K, size 0603, 4.7µF ceramic capacitor recommended based upon performance, size cost. temperature rating recommended input capacitor. temperature rating capacitors, aside from losing most their capacitance over temperature, also become resistive high frequencies. This reduces their ability filter high frequency noise. Output Capacitor MIC23150 designed with 2.2µF greater ceramic output capacitor. Increasing output capacitance will lower output ripple improve load transient response could also increase solution size cost. equivalent series resistance (ESR) ceramic output capacitor such C1608X5R0J475K, size 0603, 4.7µF ceramic capacitor recommended based upon performance, size cost. Both temperature rating capacitors recommended. temperature rating capacitors recommended their wide variation capacitance over temperature increased resistance high frequencies. Inductor Selection When selecting inductor, important consider following factors (not necessarily order importance): Inductance Rated current value Size requirements resistance (DCR)
shown calculation above, peak inductor current inversely proportional switching frequency inductance; lower switching frequency inductance higher peak current. input voltage increases, peak current also increases. size inductor depends requirements application. Refer Typical Application Circuit Bill Materials details. resistance (DCR) also important. While inversely proportional size, represent significant efficiency loss. Refer Efficiency Considerations. Compensation MIC23150 designed stable with 0.47µH 2.2µH inductor with minimum 2.2µF ceramic (X5R) output capacitor. Duty Cycle typical maximum duty cycle MIC23150 80%. Efficiency Considerations Efficiency defined amount useful output power, divided amount power supplied.
Efficiency
MIC23150 designed with 0.47µH 2.2µH inductor. faster transient response, 0.47µH inductor will yield best result. lower output ripple, 2.2µH inductor recommended. Maximum current ratings inductor generally given methods; permissible current saturation current. Permissible current rated either 40°C temperature rise loss February 2009
Maintaining high efficiency serves purposes. reduces power dissipation power supply, reducing need heat sinks thermal design considerations reduces consumption current battery-powered applications. Reduced current draw from battery increases devices operating time critical hand held devices. There types losses switching converters; losses switching losses. losses simply power dissipation I2R. Power dissipated high side switch during cycle. Power loss equal high side MOSFET RDSON multiplied Switch Current squared. During cycle, side Nchannel MOSFET conducts, also dissipating power. Device operating current also reduces efficiency. product quiescent (operating) current supply voltage represents another loss. current required driving gates constant 4MHz frequency switching transitions make switching losses.
M9999-082908-A
Micrel Inc.
Efficiency 1.8V
2.7V
MIC23150 error comparator turns PMOS minimumoff-time until output drops below threshold. NMOS acts ideal rectifier that conducts when PMOS off. Using NMOS switch instead diode allows lower voltage drop across switching device when asynchronous switching combination between PMOS NMOS allows control loop work discontinuous mode light load operations. discontinuous mode, MIC23150 works pulse frequency modulation (PFM) regulate output. output current increases, off-time decreases, thus provides more energy output. This switching scheme improves efficiency MIC23150 during light load currents only switching when needed. load current increases, MIC23150 goes into continuous conduction mode (CCM) switches frequency centered 4MHz. equation calculate load when MIC23150 goes into continuous conduction mode approximated following formula:
VOUT LOAD
EFFICIENCY
3.0V
3.6V
4.2V 5.0V
5.5V
1.0µH COUT 4.7µF 1000 10000 OUTPUT CURRENT (mA)
Figure Efficiency Under Load
figure above shows efficiency curve. From load 100mA, efficiency losses dominated quiescent current losses, gate drive transition losses. using HyperLight Loadmode, MIC23150 able maintain high efficiency output currents. Over 100mA, efficiency loss dominated MOSFET RDSON inductor losses. Higher input supply voltages will increase Gate-to-Source threshold internal MOSFETs, thereby reducing internal RDSON. This improves efficiency reducing losses device. inductor losses inherent device. which case, inductor selection becomes increasingly critical efficiency calculations. inductors reduced size, resistance (DCR) become quite significant. losses calculated follows: PDCR IOUT2 From that, loss efficiency inductor resistance calculated follows:
shown previous equation, load which MIC23150 transitions from HyperLight Loadmode mode function input voltage (VIN), output voltage (VOUT), duty cycle (D), inductance frequency (f). shown Figure Output Current increases, switching frequency also increases until MIC23150 goes from HyperLight Loadmode mode approximately 120mA. MIC23150 will switch relatively constant frequency around 4MHz once output current over 120mA.
Frequency Output Current
FREQUENCY (MHz)
VOUT IOUT Efficiency Loss IOUT PDCR
3.0V
3.6V
Efficiency loss minimal light loads gains significance load increased. Inductor selection becomes trade-off between efficiency size this case. HyperLight LoadMode MIC23150 uses minimum time proprietary control loop (patented Micrel). When output voltage falls below regulation threshold, error comparator begins switching cycle that turns PMOS keeps duration minimum-on-time. This increases output voltage. output voltage over regulation threshold, then
4.2V
4.7µH VOUT 1.8V 0.001
0.01
4.7µF
1000 10000 OUTPUT CURRENT (mA)
Figure Frequency Output Current
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
MIC23150 Typical Application Circuit
MIC23150
ThinMLF
VOUT
AGND PGND
Bill Materials
Item
Notes:
TDK: www.tdk.com Coilcraft: www.coilcraft.com Micrel, Inc.: www.micrel.com
Part Number C1608X5R0J475K VLS3010T-1R0N1R9 VLS4012T-1R0N1R6 DO2010-102ML MIC23150-xYMT
Manufacturer TDK(1)
Description 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 1µH, 1.9A, 60m, L3.0mm W3.0mm H1.0mm 1µH, 2.8A, 50m, L4.0mm W4.0mm H1.2mm 1µH, 1.8A, 162m, L2.0mm W2.0mm H1.0mm 4MHz Buck Regulator with HyperLight LoadMode
Qty.
Coilcraft
Micrel, Inc.(3)
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Layout Recommendations
Thin MILF Layer
Thin Bottom Layer
February 2009
M9999-082908-A
Micrel Inc.
MIC23150
Package Information
8-Pin Thin
MICREL, INC. 2180 FORTUNE DRIVE JOSE, 95131
(408) 944-0800 (408) 474-1000 http://www.micrel.com
information furnished Micrel this data sheet believed accurate reliable. However, responsibility assumed Micrel use. Micrel reserves right change circuitry specifications time without notification customer. Micrel Products designed authorized components life support appliances, devices systems where malfunction product reasonably expected result personal injury. Life support devices systems devices systems that intended surgical implant into body support sustain life, whose failure perform reasonably expected result significant injury user. Purchaser's sale Micrel Products life support appliances, devices systems Purchaser's risk Purchaser agrees fully indemnify Micrel damages resulting from such sale.
February 2009
M9999-082908-A
2008 Micrel, Incorporated.

MIC23150

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