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LT4356IMS-3TR

Description
SPECIALTY ANALOG CIRCUIT, PDSO12
Categoryaccessories   
File Size215KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LT4356IMS-3TR Overview

SPECIALTY ANALOG CIRCUIT, PDSO12

LT4356-3
Surge Stopper with
Fault Latchoff
FEATURES
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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 V
CC
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 spare 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. A shutdown pin reduces the quiescent current
to less than 7μA during shutdown.
Stops High Voltage Surges
Adjustable Output Clamp Voltage
Overcurrent Protection
Wide Operation Range: 4V to 80V
Reverse Input Protection to –60V
Low 7μA Shutdown Current
Adjustable Latchoff Fault Timer
Controls N-channel MOSFET
Shutdown Pin Withstands –60V to 100V
Fault Output Indication
Spare Amplifier for Level Detection Comparator or
Linear Regulator Controller
Available in (4mm
×
3mm) 12-Pin DFN,
10-Pin MSOP or 16-Pin SO Packages
APPLICATIONS
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Automotive/Avionic Surge Protection
Hot Swap/Live Insertion
High Side Switch for Battery Powered Systems
Intrinsic Safety Applications
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
4A, 12V Overvoltage Output Regulator
V
IN
12V
10mΩ
IRLR2908
V
OUT
Overvoltage Protector Regulates Output at
27V During Transient
80V INPUT SURGE
C
TMR
= 6.8μF
I
LOAD
= 500mA
10Ω
383k
V
CC
SHDN
IN
100k
EN
UNDERVOLTAGE
A
OUT
GND
TMR
FLT
43563 TA01
102k
OUT
FB
4.99k
V
CC
DC-DC
CONVERTER
SHDN
GND
FAULT
V
OUT
20V/DIV
12V
LT4356-3TA01b
SNS
GATE
V
IN
20V/DIV
12V
27V ADJUSTABLE CLAMP
+
LT4356DE-3
100ms/DIV
0.1μF
43563f
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