LM74700QDBVRQ1

LM74700-Q1 Low IQ Reverse Battery Protection Ideal Diode Controller
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
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• 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 turnoff current
• Fast response to reverse current blocking:
< 0.75 μs
• Meets automotive ISO7637 transient requirements
with a suitable TVS Diode
• Available in 6-pin and 8-pin SOT-23 Package 2.90
mm × 1.60 mm
2 Applications
• Automotive ADAS systems - camera
• Automotive infotainment systems - digital cluster,
head unit
• Industrial factory automation - PLC
• Enterprise power supplies
• Active ORing for redundant power

3 Description
The LM74700-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 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 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 ensures
zero DC reverse current flow. Fast response (< 0.75
μs) to Reverse Current Blocking makes the device
suitable for systems with output voltage holdup
requirements during ISO7637 pulse testing as well as
power fail and input micro-short conditions.
The LM74700-Q1 controller provides a charge pump
gate drive for an external N-channel MOSFET. The
high voltage rating of LM74700-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.