LM7481集成电路（IC）的OR控制器理想二极管规格书PDF中文资料

LM7481属于集成电路（IC）的OR控制器理想二极管。由德州仪器制造生产的LM7481OR 控制器，理想二极管理想二极管控制器也称为 OR-ing 控制器，可用于以仅允许单向电流的方式控制外部通道晶体管（通常为 FET），类似于整流二极管，但传导损耗低得多。在其他应用中，它们通常用于在为了冗余和增加电流输出能力而并行连接的电源中提供逆流保护。

1 Features

• Qualified for extended temperature applications

– Device temperature:

–55°C to +125°C ambient operating

temperature range

• 3-V to 65-V input range

• Reverse input protection down to –65 V

• Drives external back to back N-channel MOSFETs

• Ideal diode operation with 9.1-mV A to C forward

voltage drop regulation

• Low reverse detection threshold (–4 mV) with fast

response (0.5 μs)

• Active rectification up to 200-KHz

• 60-mA peak gate (DGATE) turn-on current

• 2.6-A peak DGATE turnoff current

• Integrated 3.8-mA charge pump

• Adjustable overvoltage protection

• Low 2.87-μA shutdown current (EN/UVLO=Low)

• 2.6-A peak DGATE turn-off current

• Meets automotive ISO7637 transient requirements

with a suitable TVS diode

• Available in space saving 12-pin WSON package

2 Applications

• Avionics Input reverse polarity protection

– Sensors

– Imaging

– Radar

• Active ORing for redundant power

3 Description

The LM74810 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 and overvoltage protection. The wide

input supply of 3 V to 65 V allows protection and

control of 12-V and 24-V input powered systems.

The device can withstand and protect the loads

from negative supply voltages down to –65-V. 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) and overvoltage

protection using HGATE control. The device features

an adjustable overvoltage cut-off protection feature.

LM74810 employs reverse current blocking using

linear regulation and comparator scheme. With

common drain configuration of the power MOSFETs,

the mid-point can be utilized for OR-ing designs using

another ideal diode. The LM74810 has a maximum

voltage rating of 65 V. The loads can be protected

from extended overvoltage transients like 200-V

unsuppressed load dumps in 24-V battery systems

by configuring the device with external MOSFETs in

common source topology.