Low Input Voltage Synchronous Step-Down DC/DC Controller LTC3852-EEWORLD

Collect

describe

^{The LTC®3852} is a constant frequency, current mode, step-down DC/DC controller that can be powered by an on-board charge pump. Input supply voltage as low as 2.7V, when doubled by the charge pump, provides 5V to the LTC3852's control logic and gate drivers, thus supporting a wide range of logic level N-channel power MOSFETs.

The constant frequency current mode architecture provides a phase-lockable fixed frequency up to 750kHz. RUN provides a precision enable threshold, while the TRACK/SS pin combines tracking and adjustable soft-start functions.

The MODE/PLLIN pin selects between Burst Mode ^® operation, pulse-skipping mode, and continuous current mode. Current foldback limits MOSFET power dissipation during short-circuit conditions. Reverse current and current foldback are disabled during soft-start. A power-good output pin indicates when the output is within ±10% of its designed set point.

Features

● Charge pump input range: 2.7V to 5.5V

● Controller input range: 4V to 38V

● Integrated charge pump provides 5V gate drive voltage for logic level MOSFET

● RSENSE or DCR current sensing

± 1.25% output voltage accuracy over the entire temperature range

● Phase-lockable fixed frequency: 250kHz to 750kHz

● Power Good Output Voltage Monitor

● Adjustable soft start voltage ramp up

● Current foldback is disabled during startup

● No reverse current during soft start

● Selectable constant frequency, pulse skipping or burst mode (Burst Mode?) operation

● Output overvoltage protection

● Very low dropout operation: 99% duty cycle

● 24-pin (3mm x 5mm) QFN package

Encapsulation

Typical Applications

application

● Universal 3.3V system

● Lithium-ion battery-powered devices

● Distributed DC power supply system

Keywords：Buck Reference address：Low Input Voltage Synchronous Step-Down DC/DC Controller LTC3852

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