LM74700

GATE

CATHODE

EN

ANODE

VCAP

GND

TVS

Voltage

Regulator

Copyright © 2017, Texas Instruments Incorporated

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. ADVANCE INFORMATION for pre-production products; subject to

change without notice.

LM74700-Q1

SNOSD17 – OCTOBER 2017

1

1 Features

1

•

Qualified for Automotive Applications

•

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 V to 65 V Input Range

•

–65 V Reverse Voltage Rating

•

Charge Pump for External N-Channel MOSFET

•

20 mV ANODE to CATHODE Forward Voltage

Drop Regulation

•

Enable Pin Feature

•

3 µA Shutdown Current (EN=Low)

•

30 µA Operating Quiescent Current (EN=High)

•

1.5-A Peak Gate Turnoff Current

•

Fast Response to Reverse Current Blocking:

< 2 µs

•

Meets Automotive ISO7637 Transient

Requirements with a Suitable TVS Diode

•

–40°C to +150°C Operating Junction Temperature

•

6-Pin SOT 23-6 Package (3-mm x 3-mm)

2 Applications

•

Automotive Battery Regulation

•

Industrial Power Supplies

•

Telecom and Datacom Systems

•

Battery Powered System

•

Active ORing for Redundant Power

•

Full-Bridge Rectifier

3 Description

The LM74700-Q1 is a smart diode controller operates

in conjunction with an external N-channel MOSFET

as an ideal diode rectifier for low loss reverse polarity

protection. The wide supply input range of 3 to 65 V

allows control of many popular DC bus voltages. The

device can withstand and protect the loads from

negative supply voltages down to –65 V. With a low

forward

voltage

drop

can

be

achieved

while

minimizing the amount of power dissipated in the

MOSFET. For low load currents, the forward voltage

is regulated to 20-mV to enable graceful shutdown of

the MOSFET. External MOSFETs with 5 V or lower

threshold voltage are recommended. With the enable

pin low, the controller is off and draws approximately

3-µA of current.

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.

Fast

response

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 brownout

conditions. The LM74700-Q1 is also suitable for

ORing applications or AC rectification.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM74700-Q1

SOT 23-6

2.9 mm x 1.6 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Schematic