LT4356MP-1/LT4356MP-2
Surge Stopper
FEATURES DESCRIPTION
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Stops High Voltage Surges The LT 4356 surge stopper protects loads from high volt-
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Adjustable Output Clamp Voltage age transients. It regulates the output during an overvolt-
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Overcurrent Protection age event, such as load dump in automobiles, by control-
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Wide Operation Range: 4V to 80V ling the gate of an external N-channel MOSFET. The output
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Reverse Input Protection to 60V is limited to a safe value thereby allowing the loads to
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Low 7A Shutdown Current, LT4356-1 continue functioning. The LT4356MP also monitors the
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Adjustable Fault Timer voltage drop between the V and SNS pins to protect
CC
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Controls N-Channel MOSFET against overcurrent faults. An internal amplifier limits the
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Shutdown Pin Withstands 60V to 100V current sense voltage to 50mV. In either fault condition, a
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Fault Output Indication timer is started inversely proportional to MOSFET stress.
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Guaranteed Operation 55C to 125C If the timer expires, the FLT pin pulls low to warn of an
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Auxiliary Amplifier for Level Detection Comparator or impending power-down. If the condition persists, the
Linear Regulator Controller MOSFET is turned off. After a cooldown period, the GATE
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Available in 10-Pin MSOP or 16-Pin SO Packages pin pulls up turning on the MOSFET again.
The auxiliary amplifier may be used as a voltage detection
comparator or as a linear regulator controller driving an
APPLICATIONS
external PNP pass transistor.
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Automotive/Avionic Surge Protection
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Hot Swap/Live Insertion Back-to-back FETs can be used in lieu of a Schottky diode
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High Side Switch for Battery Powered Systems for reverse input protection, reducing voltage drop and
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Intrinsic Safety Applications power loss. A shutdown pin reduces the quiescent current
to less than 7A for the LT4356-1 during shutdown. The
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
NoR and ThinSOT are trademarks of Analog Devices, Inc. All other trademarks are the
SENSE
LT4356-2 differs from the LT4356-1 during shutdown by
property of their respective owners.
reducing the quiescent current to 60A and keeping alive
the auxiliary amplifier for uses such as an undervoltage
lockout or always-on regulator.
TYPICAL APPLICATION
4A, 12V Overvoltage Output Regulator Overvoltage Protector Regulates Output at
27V During Transient
10m
IRLR2908 V
OUT
V
IN
12V
C = 6.8F
80V INPUT SURGE
TMR
I = 500mA
LOAD
10
102k
V
IN
V SNS GATE OUT 20V/DIV
CC
383k
FB
V
CC
SHDN
12V
4.99k
27V ADJUSTABLE CLAMP
+ DC-DC
IN LT4356S
V
OUT
CONVERTER
20V/DIV
100k
12V
EN SHDN
GND
UNDERVOLTAGE A FLT FAULT
OUT 4356mp12 TA01b
GND TMR
100ms/DIV
4356mp12 TA01
0.1F
4356mp12fc
1
For more information www.linear.com/LT4356MP-1LT4356MP-1/LT4356MP-2
ABSOLUTE MAXIMUM RATINGS (Notes 1 and 2)
V , SHDN ................................................ 60V to 100V Operating Temperature Range
CC
SNS ............................. V 30V or 60V to V + 0.3V LT4356M ............................................ 55C to 125C
CC CC
OUT, A , FLT, EN ..................................... 0.3V to 80V Storage Temperature Range
OUT
GATE (Note 3) .................................0.3V to V + 10V MS, SO .............................................. 65C to 150C
OUT
+
FB, TMR, IN ................................................ 0.3V to 6V Lead Temperature (Soldering, 10 sec)
+
A , EN, FLT, IN .................................................. 3mA MS, SO .............................................................300C
OUT
PIN CONFIGURATION
TOP VIEW
+
TMR 1 16
IN
FB 2 15
NC
TOP VIEW
NC 3 14
A
OUT
FB 1 10 TMR
OUT 2 9 GND
OUT 4 13
NC
GATE 3 8 EN
GATE 5 12
GND
SNS 4 7 FLT
V 5 6 SHDN
CC
NC 6 11
EN
MS PACKAGE
SNS 7 10
FLT
10-LEAD PLASTIC MSOP
V 8 9
SHDN
T = 125C, = 160C/W CC
JMAX JA
S PACKAGE
16-LEAD PLASTIC SO
T = 150C, = 100C/W
JMAX JA