1 Features

• AEC-Q100 qualified for automotive applications

– Device temperature grade 1:

–40°C to +125°C ambient operating

temperature range

• 4-V to 65-V input range

• Reverse input protection down to –65 V

• Drives external back-to-back N-Channel MOSFETs

in common source configuration

• Ideal diode operation with 10.5-mV A to C forward

voltage drop regulation

• Low reverse detection threshold (–10.5 mV) with

fast DGATE turn-off response (0.5 μs)

• 18-mA peak gate (DGATE) turn on current

• 2.6-A peak DGATE turn-off current

• Adjustable overcurrent and short circuit protection

• Analog current monitor output with 10 accuracy

(IMON)

• Adjustable overvoltage and undervoltage

protection

• Low 2.5-μA shutdown current (EN=Low)

• MODE pin to allow bi-directional current flow

(MODE=Low)

• Meets automotive ISO7637 transient requirements

with a suitable TVS diode

• Available in space saving 24-pin VQFN package

2 Applications

• 12-V / 24-V automotive reverse battery protection

• Industrial transport

• Redundant power supply ORing

3 Description

The LM74930-Q1 ideal diode controller drives and

controls external back to back N-Channel MOSFETs

to emulate an ideal diode rectifier and power path ON

and OFF control with over current and overvoltage

protection. The wide input supply of 4 V to 65

V allows protection and control of 12-V and 24-V

automotive battery powered ECUs. The device can

withstand and protect the loads from negative supply

voltages down to –65 V. An integrated high side

gate control (HGATE) drives the first MOSFET in the

power path. The device allows load disconnect (ON

and OFF control) in case of overcurrent, overvoltage

and undervoltage event using HGATE control while

ideal diode controller (DGATE) drives a second

MOSFET to replace a Schottky diode for input reverse

polarity protection and output voltage holdup by

blocking the reverse current from output to input. The

device has integrated current sense amplifier which

provides with an adjustable overcurrent and short

circuit protection with circuit breaker functionality.

The device features an adjustable overvoltage and

undervoltage protection feature to protect against

supply transients. LM74930-Q1 features MODE pin

which can be used to selectively enable or disable

reverse current blocking functionality.