LTC4373 Datasheet

• 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
• High Side External N-Channel MOSFET Drive
• Drives Back-to-Back MOSFETs for Inrush Control and Load Switching
• Shutdown Input for ON/OFF Control
• Fast Reverse Current Turn-Off within 1.5μs
• 8-Lead MSOP and 3mm × 3mm DFN Packages

• Automotive Battery Protection
• Redundant Power Supplies
• Portable Instrumentation
• Solar Powered Systems
• Energy Harvesting Applications
• Supply Holdup

The 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 LTC4373 control back-to-back N-channel MOSFETs for inrush current control and load switching.

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.