Linear Technology’s LTC4227 is a compact, dual ideal diode with hot swap controller that provides PowerPath and inrush current control for redundant supplies operating from 2,9 V to 18 V.
The device regulates the forward voltage drop across two external N-channel MOSFETs to ensure smooth current transfer between supplies in diode-OR applications. The ideal diodes replace two high-power Schottky diodes and associated heatsinks, saving space while providing a low loss path to the load. The downstream hot swap control MOSFET protects the board and backplane from damage during live insertion and removal, and protects from short-circuit faults with a fast acting current limit and circuit breaker.
Prioritisation of the two supplies is made possible by a dedicated pin which turns off the ideal diode for a lower-priority supply. In addition to redundant power supply ORing, the LTC4227 makes a suitable diode replacement in supply holdup applications where momentary collapse of supply voltage is isolated from the load.
Also new is the LTC4225, which provides two independent ideal diode and hot swap paths for two power rails. While offering many similar features to the LTC4227, the LTC4225 can be configured as a power prioritiser and is also suited to MicroTCA systems, where the outputs of 12 V power modules are used to power multiple advanced mezzanine cards.
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