Texas Instruments LM74900-Q1 Handleiding

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LM749x0-Q1 Automotive Ideal Diode With Circuit Breaker, Undervoltage, and

Overvoltage Protection With Fault Output

1 Features

•AEC-Q100 qualified for automotive applications

–Device temperature grade 1:

–40°C to +125°C ambient operating

temperature range

•Functional Safety-Capable

–Documentation available to aid functional safety

system design

•3V to 65V input range

•74V Absolute Maximum Rating for LM74910H-Q1

•Reverse input protection down to –65V

•Drives external back-to-back N-Channel MOSFETs

in common drain configuration

•Ideal diode operation with 10.5mV A to C forward

voltage drop regulation

•Low reverse detection threshold (–10.5mV) with

fast turn off response (0.5µs)

•20mA peak gate (DGATE) turn on current

•2.6A peak DGATE turnoff current

•Adjustable overcurrent and short circuit protection

•Analog current monitor output with 2% accuracy

for LM74910H-Q1

•Adjustable overvoltage and undervoltage

protection

•SLEEP mode OCP Retry in LM74910H-Q1

•Low 2.5µA shutdown current (EN=Low)

•SLEEP mode with 6µA current (EN=High,

SLEEP=Low)

•Meets automotive ISO7637 transient requirements

with a suitable TVS diode

•Available in space saving 24-pin VQFN package

2 Applications

•Automotive battery protection

–ADAS domain controller

–Infotainment and cluster

–Automotive audio: external amplifier

•Active ORing for redundant power

3 Description

The LM749x0-Q1 ideal diode controller drives and

controls external back to back N-Channel MOSFETs

to emulate an ideal diode rectifier with power path

ON/OFF control with overcurrent and overvoltage

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

protection and control of 12V and 24V automotive

battery powered ECUs. The device can withstand and

protect the loads from negative supply voltages down

to –65V. An integrated ideal diode controller (DGATE)

drives the first MOSFET to replace a Schottky diode

for reverse input protection and output voltage holdup.

With a second MOSFET in the power path the

device allows load disconnect (ON/OFF control) in

case of overcurrent and overvoltage events using

HGATE control. The device has integrated current

sense amplifier which provides accurate current

monitoring with adjustable overcurrent and short

circuit thresholds. The device features an adjustable

overvoltage cut-off protection feature. The device

features a SLEEP mode which enables ultra-low

quiescent current consumption (6µA) and at the same

time providing refresh current to the always ON loads

when vehicle is in the parking state. The LM749x0-Q1

has a maximum voltage rating of 65V.

Package Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LM74900-Q1

RGE (VQFN 24)4.00mm × 4.00mm

LM74910-Q1

LM74910H-Q1

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

the end of the data sheet.

VOUT

GND

DGATE

A

HGATE

OUT

C

EN

VBATT

LM749x0-Q1

CAP

SLEEP

ON

OFF

Q2

TMR

R

SENSE

CS-

FLT

ON

OFF

R

3

R

1

SW

OV

R

LIM

I

LIM

C

IN

R

SET

I

SCP

R

2

UVLO

R

MON

CS+

I

MON

VS

Q1

R

ISCP

R

G

C

dvdt

C

OUT

C

T

Typical Application Diagram

Device Start-Up With Overcurrent Protection

LM74900-Q1, LM74910-Q1, LM74910H-Q1

SNOSDE6C – DECEMBER 2022 – REVISED AUGUST 2025

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.

Product specificaties