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Linear Technology Electronic Components Datasheet

LT4356-1 Datasheet

Surge Stopper

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LT4356-1 pdf
LT4356-1/LT4356-2
Surge Stopper
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, LT4356-1
n Adjustable Fault Timer
n Controls N-channel MOSFET
n Shutdown Pin Withstands –60V to 100V
n Fault Output Indication
n Guaranteed Operation to 125°C
n Auxiliary Amplifier for Level Detection Comparator or
Linear Regulator Controller
n Available in (4mm × 3mm) 12-Pin DFN,
10-Pin MSOP or 16-Pin SO Packages
APPLICATIONS
n Automotive/Avionic Surge Protection
n Hot Swap/Live Insertion
n High Side Switch for Battery Powered Systems
n Intrinsic Safety Applications
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DESCRIPTION
The LT®4356 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 con-
tinue functioning. The LT4356 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 condition, a timer
is started inversely proportional to MOSFET stress. If the
timer expires, the FLT pin pulls low to warn of an impend-
ing power down. If the condition persists, the MOSFET is
turned off. After a cool down period, the GATE 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
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 for the LT4356-1 during shutdown. The
LT4356-2 differs from the LT4356-1 during shutdown by
reducing the quiescent current to 60μA and keeping alive
the auxiliary amplifier for uses such as an undervoltage
lockout or always-on regulator.
TYPICAL APPLICATION
4A, 12V Overvoltage Output Regulator
VIN
10mΩ IRLR2908
VOUT
12V
383k
100k
UNDERVOLTAGE
10Ω
VCC
SHDN
IN+
SNS GATE OUT
FB
LT4356DE
AOUT
GND
EN
TMR FLT
4356 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
4356 TA01b
4356fa
1


Linear Technology Electronic Components Datasheet

LT4356-1 Datasheet

Surge Stopper

No Preview Available !

LT4356-1 pdf
LT4356-1/LT4356-2
ABSOLUTE MAXIMUM RATINGS (Notes 1 and 2)
VCC, SHDN ................................................ –60V to 100V
SNS............................. VCC – 30V or –60V to VCC + 0.3V
OUT, AOUT, FLT, EN...................................... –0.3V to 80V
GATE (Note 3) .................................–0.3V to VOUT + 10V
FB, TMR, IN+................................................ –0.3V to 6V
AOUT, EN, FLT, IN+...................................................–3mA
Operating Temperature Range
LT4356C................................................... 0°C to 70°C
LT4356I................................................ –40°C to 85°C
LT4356H ............................................ –40°C to 125°C
Storage Temperature Range
DE12.................................................. –65°C to 125°C
MS, SO .............................................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS, SO ............................................................. 300°C
PIN CONFIGURATION
TMR 1
FB 2
OUT 3
GATE 4
SNS 5
VCC 6
TOP VIEW
12 IN+
11 AOUT
10 GND
13
9 EN
8 FLT
7 SHDN
DE PACKAGE
12-LEAD (4mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL
TOP VIEW
FB 1
OUT 2
GATE 3
SNS 4
VCC 5
10 TMR
9 GND
8 EN
7 FLT
6 SHDN
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/W
TMR 1
FB 2
NC 3
OUT 4
GATE 5
NC 6
SNS 7
VCC 8
TOP VIEW
16 IN+
15 NC
14 AOUT
13 NC
12 GND
11 EN
10 FLT
9 SHDN
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 100°C/W
4356fa
2


Part Number LT4356-1
Description Surge Stopper
Maker Linear Technology
Total Page 26 Pages
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LT4356-1 pdf
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