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LTC3852 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3852 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC3852 1 3852f TYPICAL APPLICATION FEATURES DESCRIPTION Low Input Voltage, Synchronous Step-Down DC/DC Controller The LTC®3852 is a constant frequency, current mode step-down DC/DC controller which can be powered by an onboard charge pump. Input supplies as low as 2.7V, when doubled by the charge pump, provide 5V to the LTC3852’s control logic and gate drives, supporting a wide selection of logic-level N-channel power MOSFETs. Theconstant-frequencycurrentmodearchitectureallowsfor a phase-lockable fixed frequency of up to 750kHz. The RUN pinprovidesaprecisionenablethresholdwhiletheTRACK/SS pin combines tracking and adjustable soft-start features. The MODE/PLLIN pin selects among Burst Mode® oper- ation, pulse-skipping mode, and continuous current mode. Current foldback limits MOSFET power dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start. A power good output pin indicates when the output is within ±10% of its designed set point. Efficiency and Power Loss vs Load Current APPLICATIONS n Charge Pump Input Range: 2.7V to 5.5V n Controller Input Range: 4V to 38V n Integrated Charge Pump Provides 5V Gate Drive to Logic Level MOSFETs n RSENSE or DCR Current Sensing n ±1.25% Output Voltage Accuracy Over Temperature n Phase-Lockable Fixed Frequency: 250kHz to 750kHz n Power Good Output Voltage Monitor n Adjustable Soft-Start Voltage Ramping n Current Foldback Disabled During Start-Up n No Reverse Current During Soft-Start n Selectable Constant Frequency, Pulse-Skipping, or Burst Mode Operation n Output Overvoltage Protection n Very Low Dropout Operation: 99% Duty Cycle n Available in a 24-Lead (3mm ¥ 5mm) QFN Package n General Purpose 3.3V Systems n Lithium-Ion Powered Devices n Distributed DC Power Systems L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 6498466, 6580258, 6611131. PGO0D C+ C– RUN SHDN TRACK/SS ITH MODE/PLLIN FREQ/PLLFLTR VIN1 INTVCC TG SW INTVCC BG SENSE+ SENSE– VFB VPUMP VIN2 GND2 GND1 0.1μF 0.1μF 4.7μF 2.1k LTC3852 22μF VIN 2.7V TO 5.5V VOUT 1.2V 20A 3852 TA01 0.36μH 100pF CHARGE PUMP 2.2μF 1nF 0.1μF 100k 470μF ×2 BOOST 12.1k 40.2k 1% 20k 1% 95.3k + ON OFF High Efficiency Synchronous Step-Down Converter LOAD CURRENT (A) 120 10 0 100 90 80 70 60 50 40 30 20 10 0 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 3852 TA01a EFFICIENCY POWER LOSS |
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