Low Quiescent Current Ideal Diode Controller

The LTC4372/LTC4373 are positive high voltage ideal diode controllers that drive an external N-channel MOSFET to replace a Schottky diode. They control the forward voltage drop across the MOSFET to ensure current delivery or current transfer from one path to the other even at light loads.

A 5μA operating current achieves high efficiency for intermittent load applications or always-on backup power supplies. If a power source fails or is shorted, a fast turn-off minimizes reverse current transients. The LTC4372/LTC4373 control back-to-back N-channel MOSFETs for inrush current control and load switching.

The LTC4372’s SHDN pin keeps the MOSFET off and reduces the quiescent current to 3.5μA. The LTC4373 has a UV pin for undervoltage monitoring while the UVOUT pin provides hysteresis adjustment and status information. During undervoltage, the back-to-back MOSFETs are cut off and quiescent current reduces to 0.5μA.

APPLICATIONS

* Automotive Battery Protection

* Redundant Power Supplies

* Portable Instrumentation

* Solar Powered Systems

* Energy Harvesting Applications

* Supply Holdup

* Reduces Power Dissipation by Replacing a Power Schottky Diode

* Low Quiescent Current: 5μA Operating

* Wide Operating Voltage Range: 2.5V to 80V

* Reverse Supply Protection to –28V

* No TVS Input Clamps Required