28V, 2A Ideal Diode and Load Switch

The LT®4423 is a 1.9V to 28V ideal diode and load switch with integrated P-channel MOSFETs. When enabled, 15mV forward voltage regulation minimizes power dissipation while increasing operating headroom and efficiency compared to a Schottky diode.

Using two LT4423s in diode-OR applications provide a seamless transfer to the highest available voltage under varying input supply conditions. A non-enabled LT4423 blocks up to 28V in either direction or polarity while exhibiting less than 1μA (typical) leakage current, providing orders of magnitude improvement over typical Schottky diodes, which leads to extended battery life.

Fast OUT to IN reverse bias detection minimizes reverse current, preventing undesired charging of input batteries. The open-drain STATUS output pulls low when the LT4423 is in shutdown, reverse bias, or under thermal protection. Integrated thermal detection protects from overtemperature conditions by disabling the power path.

APPLICATIONS

* Schottky Diode Replacement

* Battery and Wall Adapter Diode ORing

* Backup Battery Diode ORing

* Industrial and Consumer Hand-Held Applications

* Internal 200mΩ Power Path

* Wide Operating Voltage Range: 1.9V to 28V

* Reverse Current Protection

* Load Switch Capability

* Low 10μA Quiescent Current

* Fast 3μs Response to Load Steps

* Low 500nA Off State Current

* Smooth Switchover in Diode-OR Applications

* Integrated Thermal Protection

* 10-Lead (3mm x 2mm x 0.75mm) LDFN Package