1 Features

? Input operating voltage range: 5V to 80V

– 100V absolute maximum

? 4× integrated gate drive control

? 165μA gate pull-up strength

? 100mA gate pull-down strength

? Linear gate regulation control for supply ORing

applications

– VTG_REG = 11mV

? Enable pin for user-controlled device on/off

function

? –40°C to 125°C operating junction temperature

range

? Small footprint: 3mm × 3mm VQFN-12

– Meets IPC-9592 spacing rules

2 Applications

? Video door bell

? IP cameras

? Thermostat

? Power distribution systems (24Vac)

? Polarity agnostic power inputs

3 Description

The LM74680 is an ideal diode bridge controller

that provides voltage rectification by driving four

N-channel MOSFETs in a full-bridge configuration.

LM74680 enables lower voltage drop and reduced

power dissipation as compared to conventional diode

bridge rectifiers. This helps to simplify the power

supply design, eliminate heat sinks, and reduce PCB

area. The integrated charge pump allows use of

N-channel MOSFETs, which are smaller and more

cost-effective than P-channel MOSFETs for the same

power level. It also offers fast response to reverse

current conditions for protection against input short

events. The LM74680 has an enable pin which allows

for the gate driver to be either enabled or disabled

by an external signal. The LM74680 supports voltage

rectification from DC to 1kHz.

This device is characterized for operation over a

junction temperature range of –40°C to +125°C.