DC/DC Controller LTC3865 Features/Applications-EEWORLD

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describe

^{The LTC®3865} / LTC3865-1 are high performance, dual synchronous step-down DC/DC switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture provides a phase-lockable frequency up to 770kHz. Power losses and noise are minimized by operating the two controller output stages out of phase.

The use of OPTI-LOOP ^® compensation optimizes transient response over a wide range of output capacitance and ESR values. Independent tracking/soft-start pins for each controller ramp the output voltage during startup operation. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects between Burst Mode ^® operation, pulse-skipping mode, or continuous inductor current mode. The output voltage can be precisely set by pin strapping or external resistors .

The LTC3865/LTC3865-1 are available in low profile (5mm x 5mm) 32-lead QFN and 38-lead thermally enhanced TSSOP packages.

Features

● Dual channel, 180° phase controller

● Two-pin VID output voltage setting range from 0.6V to 5V

● High efficiency: up to 95%

● R _SENSE or DCR current sensing

● Phase-lockable fixed frequency: 250kHz to 770kHz

● Adjustable current limit

● Dual N-channel MOSFET synchronous drive

● Wide V _IN range: 4.5V to 38V during operation

● Adjustable soft start current ramp up or tracking

● Output overvoltage (OV) protection with reverse current limit

● Power Good Output Voltage Monitor

● 32-pin 5mm x 5mm QFN package and 38-pin TSSOP package

Encapsulation

Typical Applications

application

● DC power distribution system

Keywords：DC/DC Reference address：DC/DC Controller LTC3865 Features/Applications

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