LTC4372/LTC4373 Diode Controllers

ADI's LTC4372 and 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 another, even at light loads.

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

The LTC4372 shutdown function reduces the quiescent current to 0.5 µA. 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 the quiescent current reduces to 0.5 µA.

The LTC4372/73 differ in a secondary technical function:

• LTC4372: The LTC4372 shutdown function reduces the quiescent current to 0.5 µA (lead part)
• LTC4373: The LTC4373 has a UV pin for undervoltage monitoring while the UVOUT pin provides hysteresis adjustment and status information

Features

• Reduces power dissipation by replacing a power Schottky diode with an external N-Channel MOSFET
• Low quiescent current: 5 µA operating, 0.5 µA shutdown minimizes power loss and conserves energy, which is especially important in battery-powered automotive and portable applications
• Wide operating voltage range: 2.5 V to 80 V supports positive high voltage rails or the return path of -48 V rails. Operate through automotive cold crank applications

Applications

• Automotive: cold crank, battery, blocking diode, and ideal diode
• Consumer: portable applications, prosumer
• Instrumentation: industrial battery-powered applications
• Aerospace and Defense: ADEF battery-powered applications