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Linear Dimensions Semiconductor

LT4356-3 Datasheet Preview

LT4356-3 Datasheet

Surge Stopper

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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 Spare 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 and LTM are registered trademarks of Linear Technology Corporation.
All other 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 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.
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
43563f
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Linear Dimensions Semiconductor

LT4356-3 Datasheet Preview

LT4356-3 Datasheet

Surge Stopper

No Preview Available !

LT4356-3www.DataSheet4U.com
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-3 ............................................... 0°C to 70°C
LT4356I-3 ............................................ –40°C to 85°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
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT4356CDE-3#PBF
LT4356CDE-3#TRPBF 43563
12-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LT4356IDE-3#PBF
LT4356IDE-3#TRPBF
43563
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
LT4356CMS-3#PBF
LT4356CMS-3#TRPBF LTFFK
10-Lead Plastic MSOP
0°C to 70°C
LT4356IMS-3#PBF
LT4356IMS-3#TRPBF LTFFK
10-Lead Plastic MSOP
–40°C to 85°C
LT4356CS-3#PBF
LT4356CS-3#TRPBF
LT4356S-3
16-Lead Plastic SO
0°C to 70°C
LT4356IS-3#PBF
LT4356IS-3#TRPBF
LT4356S-3
16-Lead Plastic SO
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT4356CDE-3
LT4356CDE-3#TR
43563
12-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LT4356IDE-3
LT4356IDE-3#TR
43563
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
LT4356CMS-3
LT4356CMS-3#TR
LTFFK
10-Lead Plastic MSOP
0°C to 70°C
LT4356IMS-3
LT4356IMS-3#TR
LTFFK
10-Lead Plastic MSOP
–40°C to 85°C
LT4356CS-3
LT4356CS-3#TR
LT4356S-3
16-Lead Plastic SO
0°C to 70°C
LT4356IS-3
LT4356CS-3#TR
LT4356S-3
16-Lead Plastic SO
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
43563f
2


Part Number LT4356-3
Description Surge Stopper
Maker Linear Dimensions Semiconductor
PDF Download

LT4356-3 Datasheet PDF






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