LTC3853

·Triple, 120° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
·Confi gurable as a 180° Dual Phase Controller Plus a Single Phase Controller
·The Third Phase Ca·Regulate Up to a 13.5V Output
·High Effi ciency: Up to 92%
·RSENSE or DCR Current Sensing
·±0.75% 0.8V Output Voltage Accuracy
·Phase-Lockable Fixed Frequency 250kHz to 750kHz
·Supports Pre-Biased Outputs
·Dual N-Channel MOSFET Synchronous Drive
·Wide VI·Range: 4.5V to 24V Operatio·(28V Abs Max)
·Adjustable Soft-Start Current Ramping or Tracking
·Foldback Output Current Limiting
·Output Overvoltage Protection
·Dual Power Good Output Voltage Monitors
·40-Lead 6mm × 6mm QF·Package

The LTC^®3853 is a high performance triple output stepdown switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and supply noise are minimized by operating the output stages out of phase. The part of LTC3853 can be confi gured as a dual phase controller plus a single phase controller if needed. The part can also be confi gured to provide a single 3-phase output for even higher output currents.

A wide 4.5V to 24V (28V maximum) input voltage supply range encompasses most battery chemistries and intermediate bus voltages. Phase 3 of LTC3853 can regulate output voltages up to 13.5V. A constant frequency current mode architecture of LTC3853 allows for a phase-lockable frequency up to 750kHz.

Independent TK/SS pins for each output ramps the output voltages and can be configured for coincident or ratiometric tracking. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin of LTC3853 selects among Burst Mode® operation, pulse-skipping or continuous inductor current modes.