Diodes Incorporated — DZDH0401DW Ideal Diode Controller

Diodes Incorporated has launched the DZDH0401DW, an ideal diode controller for system protection against reverse discharge. The device drives a P-channel MOSFET and provides the high-side isolation necessary for reverse-current blocking in systems operating at up to 40 V.

By combining the DZDH0401DW with a low on-resistance MOSFET, designers will benefit from vastly reduced power dissipation when compared to Schottky diode circuits, particularly in high-power applications such as hot-swappable redundant power supplies and battery discharge protection. The improved efficiency results in lower thermal-management costs and improved system reliability.

The complete reverse-discharge protection circuit consists of the controller plus an external MOSFET and two resistors. The DZDH0401DW detects when input power is disconnected, then drives the MOSFET into an Off state, thereby isolating any return-current path and maintaining system stability.

This simple and compact arrangement minimizes design effort and provides a solution which is suitable for deployment in space-constrained designs. The DZDH0401DW is supplied in a SOT363 package which measures 2.15 mm x 2.1 mm x 1 mm.