资 源 简 介
The LTC®4352 creates a near-ideal diode using an externalN-channel MOSFET. It replaces a high power Schottkydiode and the associated heat sink, saving power andboard area. The ideal diode funcTIon permits low losspower ORing and supply holdup applicaTIons.The LTC4352 regulates the forward voltage drop acrossthe MOSFET to ensure smooth current transfer in diode-ORapplicaTIons. A fast turn-on reduces the load voltage droopduring supply switch-over. If the input supply fails or isshorted, a fast turn-off minimizes reverse currents.The controller operates with supplies from 2.9V to 18V.For lower voltages, an external supply is needed at theVCC pin. Power passage is disabled during undervoltageor overvoltage condiTIons. The controller also features anopen MOSFET detect circuit that fl ags excessive voltagedrop across the pass transistor in the on state. A REV pinenables reverse current, overriding the diode behaviorwhen desired.
