Wide-supply ORing controller with fast reverse-current protection
The LTC4359IDCB#WTRMPBF is an N+1 ORing controller from Analog Devices that drives an external N-channel MOSFET to replace a Schottky diode in redundant power paths. It operates from 4V to 80V, covering 12V automotive, 24V truck, and 48V telecom rails without an external supply regulator. Automotive AEC-Q100 qualification means this part has passed the full suite of stress tests for under-hood and chassis-domain electronics — 1000-hour HTRB, temperature cycling, and ESD robustness — so it fits production BOMs for ADAS, infotainment, and body-control modules without a separate qualification run.
Asymmetric timing — 200 µs on, 300 ns off
The turn-on delay is 200 µs, which allows the input supply to stabilise and prevents inrush current from charging a pre-biased output capacitor. The turn-off delay is 300 ns — fast enough to catch a reverse-current event before the MOSFET body diode conducts and the output voltage droops. This asymmetry is deliberate: slow start for controlled power-up, fast stop for fault containment. Supply current is 150 µA, low enough to keep the controller biased continuously in a redundant supply where one rail is always on standby. The 1:1 input-to-output ratio means each controller manages one MOSFET for one power path — no scaling needed for a single ORing stage.
Package and footprint — 6-DFN with exposed pad
Housed in a 6-WFDFN with exposed pad, the supplier device package is 6-DFN (2x3 mm).