This article introduces a solution that uses a MOSFET-based ideal diode to replace Schottky diodes. This solution can reduce voltage drop and power dissipation, improve system efficiency, and reduce the complexity, size, and cost of thermal layout.
The first section details the use of the LTC4357 ideal diode controller to replace Schottky diodes in redundant power supplies and solar battery charging systems. It explains how this approach reduces heat dissipation and prevents backfeeding by utilizing a MOSFET driven by the controller.
The second section describes voltage monitoring applications using the LTC2930, LTC2931, and LTC2932 series. These devices monitor multiple supplies with high accuracy (±1.5%) and include features like watchdog timers and adjustable thresholds to manage system power states.
The device operates over a supply voltage range of 9V to 80V.
The device has an absolute maximum rating of 100V.
The controller responds by pulling the gate low in less than 0.5µs.