LT4356IDE-3-TRPBF Просмотр технического описания (PDF) - Analog Devices

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LT4356IDE-3-TRPBF

Surge Stopper with Fault Latchoff

Analog Devices 

FEATURES

n Stops High Voltage Surges

n Adjustable Output Clamp Voltage

n Overcurrent Protection

n Wide Operation Range: 4V to 80V

n Reverse Input Protection to –60V

n Low 7µA Shutdown Current

n Adjustable Latchoff Fault Timer

n Controls N-channel MOSFET

n Shutdown Pin Withstands –60V to 100V

n Fault Output Indication

n Auxiliary Amplifier for Level Detection Comparator or

Linear Regulator Controller

n Available in 12-Pin 4mm × 3mm DFN,

10-Pin MSOP, and 16-Pin SO Packages

APPLICATIONS

n Automotive/Avionic Surge Protection

n Hot Swap/Live Insertion

n High Side Switch for Battery Powered Systems

All registered trademarks and trademarks are the property of their respective owners.

LT4356-3

Surge Stopper with

Fault Latchoff

DESCRIPTION

The LT®4356-3 surge stopper protects loads from high

voltage transients. It regulates the output during an

overvoltage event, such as load dump in automobiles, by

controlling the gate of an external N-channel MOSFET. The

output is limited to a safe value thereby allowing the loads

to continue functioning. The LT4356-3 also monitors the

voltage drop between the VCC and SNS pins to protect

against overcurrent faults. An internal amplifier limits

the current sense voltage to 50mV. In either fault condi-

tion, a timer is started inversely proportional to MOSFET

stress. If the timer expires, the FLT pin pulls low to warn

of an impending power down. If the condition persists,

the MOSFET is turned off, until the SHDN pin pulls low

momentarily.

The auxiliary amplifier may be used as a voltage detection

comparator or as a linear regulator controller driving an

external PNP pass transistor.

Back-to-back FETs can be used in lieu of a Schottky diode

for reverse input protection, reducing voltage drop and

power loss. The SHDN input turns off the part, including

the auxiliary amplifier, and reduces the quiescent current

to less than 7µA.

TYPICAL APPLICATION

4A, 12V Overvoltage Output Regulator

VIN

10mΩ IRLR2908

VOUT

12V

383k

100k

UNDERVOLTAGE

10Ω

VCC

SHDN

IN+

SNS GATE OUT

FB

LT4356DE-3

AOUT

GND

EN

TMR FLT

43563 TA01

0.1µF

102k

4.99k

VCC

DC-DC

CONVERTER

SHDN GND

FAULT

Overvoltage Protector Regulates Output at

27V During Transient

80V INPUT SURGE

CTMR = 6.8µF

ILOAD = 500mA

VIN

20V/DIV

12V

VOUT

20V/DIV

12V

27V ADJUSTABLE CLAMP

100ms/DIV

LT4356-3TA01b

Rev D

For more information www.analog.com

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