DZDH0401DW Diode Controller

Diodes’ DZDH0401DW diode controller for system protection against reverse discharge. The device drives a P-channel MOSFET and provides the high-side rail isolation necessary for reverse current blocking in systems up to 40 V. Applications include cordless power tools and autonomous household/garden appliances, along with OR-ing rectifiers used in the hot-swappable and N+1 redundancy power supplies found in data center servers.

By combining the DZDH0401DW with a low on-state resistance MOSFET, designers will benefit from vastly reduced power dissipation compared to Schottky diode solutions, particularly in high-power applications. This improved efficiency means lower thermal management costs and increased system reliability. In this configuration, the DZDH0401DW detects when input power disconnects then drives the MOSFET into an OFF state, thereby isolating any return current path and maintaining system stability.

The complete reverse discharge protection solution consists of the controller, a MOSFET, and two resistors. This simple and compact arrangement minimizes design effort and provides a suitable solution for deployment in space-constrained designs. The DZDH0401DW is available in the compact SOT363 package (2.1 mm x 2.15 mm x 1.0 mm).