1 Features

? AEC-Q100 qualified with the following results

– Device temperature grade 1:

–40°C to +125°C ambient operating

temperature range

– Device HBM ESD classification level 2

– Device CDM ESD classification level C4B

? 3.2-V to 65-V input range (3.9-V start-up)

? –65-V reverse voltage rating

? Charge pump for external N-Channel MOSFET

? 20-mV ANODE to CATHODE forward voltage drop

regulation

? Enable pin feature

? 1-μA shutdown current (EN=Low)

? 80-μA operating quiescent current (EN=High)

? 2.3-A peak gate turn-off current

? < 0.75-μs response to reverse current blocking

? Meets automotive ISO7637 transient requirements

with a suitable TVS Diode

? Available in an 8-pin SOIC package

2 Applications

? Automotive ADAS systems - camera

? Automotive infotainment systems - head unit

? Industrial factory automation - PLC

? Enterprise power supplies

? Active OR-ing for redundant power

3 Description

The LM74700D-Q1 is an automotive AEC Q100

qualified ideal diode controller, which operates in

conjunction with an external N-channel MOSFET as

an ideal diode rectifier for low loss reverse polarity

protection with a 20-mV forward voltage drop. The

wide supply input range of 3.2 V to 65 V allows control

of many popular DC bus voltages such as 12-V, 24-V,

and 48-V automotive battery systems. The 3.2-V input

voltage support is particularly well designed for severe

cold crank requirements in automotive systems. The

device can withstand and protect the loads from

negative supply voltages down to –65 V.

The device controls the GATE of the MOSFET to

regulate the forward voltage drop at 20 mV. The

regulation scheme enables graceful turn-off of the

MOSFET during a reverse current event and makes

sure of zero DC reverse current flow. Fast response

(< 0.75 μs) to reverse current blocking makes the

device designed for systems with output voltage

holdup requirements during ISO7637 pulse testing as

well as power fail and input micro-short conditions.

The LM74700D-Q1 controller provides a charge

pump gate drive for an external N-channel MOSFET.

The high voltage rating of LM74700D-Q1 helps to

simplify the system designs for automotive ISO7637

protection. With the enable pin low, the controller is off

and draws approximately 1 μA of current.