LTC1625
FEATURES s s s s s s s s s s s s s s s s
DESCRIPTION
The LTC®1625 is a synchronous step-down switching regulator controller that drives external N-Channel power MOSFETs using few external ponents. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. The frequency of a nominal 150k Hz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range. Burst Mode TM operation at low load currents reduces switching losses and low dropout operation extends operating time in battery-powered systems. A forced continuous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded. Fault protection is provided by foldback current limiting and an output overvoltage parator. An external capacitor attached to the RUN/SS pin provides soft start capability for supply sequencing. A wide supply range allows operation from 3.7V (3.9V for LTC1625I) to...
