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 input reverse voltage rating

• Integrated charge pump to drive

– External back-to-back N-Channel MOSFETs

– External high side switch MOSFET

– External reverse polarity protection MOSFET

• Gate drive variants

– LM74502-Q1: 60-μA peak gate drive source

capacity

– LM74502H-Q1: 11-mA peak gate drive source

capacity

• 2-A peak gate sink capacity

• 1-μA shutdown current (EN/UVLO = Low)

• 45-μA typical operating quiescent current (EN/

UVLO = High)

• Adjustable overvoltage and undervoltage

protection

• Meets automotive ISO7637 pulse 1 transient

requirements with additional TVS diode

• Available in 8-pin SOT-23 package 2.90 mm ×

1.60 mm

2 Applications

• Body electronics and lighting

• Automotive infotainment systems – digital cluster,

head unit

• Automotive USB hubs

3 Description

The LM74502-Q1, LM74502H-Q1 is an automotive

AEC-Q100 qualified controller which operates in

conjunction with an external back-to-back connected

N-channel MOSFETs as a low loss reverse polarity

protection and load disconnect solution. 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 suited

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 LM74502-Q1, LM74502H-Q1 does not have

reverse current blocking and is suitable for input

reverse polarity protection of loads that can potentially

deliver energy back to the input supply such as

automotive body control module motor loads.

The LM74502-Q1 controller provides a charge pump

gate drive for an external N-channel MOSFET.

The high voltage rating of LM74502-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, thus

offering low system current when put into sleep mode.

LM74502-Q1 offers programmable overvoltage and

undervoltage protection which cuts off the load from

the input source in case of these faults.