The LTC®3853 is a high performance triple output stepdownswitching regulator controller that drives all N-channelsynchronous power MOSFET stages. Power loss andsupply noise are minimized by operating the output stagesout of phase. The part can be confi gured as a dual phasecontroller plus a single phase controller if needed. Thepart can also be confi gured to provide a single 3-phaseoutput for even higher output currents.A wide 4.5V to 24V (28V maximum) input voltage supplyrange encompasses most battery chemistries andintermediate bus voltages. Phase 3 can regulate outputvoltages up to 13.5V. A constant frequency current modearchitecture allows for a phase-lockable frequency up to750kHz.Independent TK/SS pins for each output ramps the outputvoltages and can be confi gured for coincident or ratiometrictracking. Current foldback limits MOSFET heat dissipationduring short-circuit conditions. The MODE/PLLIN pinselects among Burst Mode® operation, pulse-skipping orcontinuous inductor current modes.
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