Ideal diode controller for system protection against reverse discharge

Diodes Incorporated has released an ideal diode controller for system protection against reverse discharge. Emulating an ideal diode by driving a P-channel MOSFET, the DZDH0401DW controller offers the high-side rail isolation required for reverse current blocking in systems up to 40V. This arrangement's compact size and high-performance abilities indicate that it is optimised for employment in cordless power tools and autonomous household/garden appliances (such as smart vacuum cleaners and smart lawnmowers). It is also perfect for other applications, including OR-ing rectifiers utilised in the hot-swappable and N+1 redundancy power supplies used in data centre servers.

By combining the device with a low on-state resistance MOSFET, designers will benefit from vastly reduced power dissipation compared to Schottky diode solutions, especially in high power applications. This improved efficiency results in lower thermal management costs and enhanced system reliability. In this configuration, the device detects when input power is disconnected, then drives the MOSFET into an OFF state, thereby isolating any return current path and sustaining system stability.

The complete reverse discharge protection solution comprises the controller, a MOSFET and two resistors. This compact and straightforward arrangement minimises design effort and provides a suitable solution for deployment in space-constrained designs.

The device is provided in a SOT363 package (with 2.15mm x 2.1mm x 1mm dimensions).