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.