LM74700-EP Low IQ Ideal Diode Controller

1 Features

• 3.2-V to 65-V Input range (3.9-V startup)

• –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 8 pin SOT-23 package 2.90 mm × 1.60

mm

• Military temperature range –55°C to +125°C

• One fabrication, assembly and test site

• Extended product life cycle

• Extended product change notification

• Product traceability

2 Applications

• Aerospace and defense

• Medical imaging

• Active ORing for redundant power

3 Description

The LM74700-EP is an 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 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 power fail and input micro-short

conditions.

The LM74700-EP controller provides a charge pump

gate drive for an external N-channel MOSFET.

The high voltage rating of LM74700-EP 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. The

LM74700-EP is fully specified over the temperature

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM74700-EP

SOT-23 (8)

2.90 mm × 1.60 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

LM74700

GATE

CATHODE

EN

ANODE

VCAP

GND

TVS

Voltage

Regulator

ON OFF

Typical Application Schematic

V

OUT

V

BATT

I

BATT

V

GATE

Reverse Current Blocking During Input Short

LM74700-EP

SNOSDD6 – SEPTEMBER 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.