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
• Charge pump for external N-Channel MOSFET
• Enable pin feature
• 1-μA shutdown current (EN=Low)
• 80-μA typical operating quiescent current
(EN=High)
• 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
• Industrial factory automation - PLC

3 Description
The LM74500-Q1 is an automotive AEC Q100
qualified controller which operates in conjunction with
an external N-channel MOSFET as a low loss reverse
polarity protection 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 LM74500-Q1 does not
have reverse current blocking and is suitable for input
reverse poalrity protection of loads that can potentially
deliver energy back to the input supply such as
automotive body control module motor loads.
The LM74500-Q1 controller provides a charge pump
gate drive for an external N-channel MOSFET. The
high voltage rating of LM74500-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.