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LTC3865/LTC3865-1 - Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

The LTC3865/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 allows a phase-lockable frequency of up to 770kHz. Power loss and noise are minimized by operating the two controller output stages out of phase.

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

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

Features Dual, 180° Phased Controllers 2-Pin VID Output Voltage Programming from 0.6V to 5V High Efficiency: Up to 95% RSENSE or DCR Current Sensing Phase-Lockable Fixed Frequency 250kHz to 770kHz Adjustable Current Limit Dual N-Channel MOSFET Synchronous Drive Wide VIN Range: 4.5V to 38V Operation Adjustable Soft-Start Current Ramping or Tracking Output OV Protection With Reverse Current Limit Power Good Output Voltage Monitor 32-Pin 5mm × 5mm QFN and 38-Lead TSSOP Packages Typical Application

Applications DC Power Distribution Systems Packaging

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