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 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 can regulate output
voltages up to 13.5V. A constant frequency current mode
architecture allows for a phase-lockable frequency up to
750kHz.
Independent TK/SS pins for each output ramps the output
voltages and can be confi gured for coincident or ratiometric
tracking. Current foldback limits MOSFET heat dissipation
during short-circuit conditions. The MODE/PLLIN pin
selects among Burst Mode? operation, pulse-skipping or
continuous inductor current modes.