LTC4380
Low Quiescent Current
Surge Stopper
Fea T Descrip T
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Low Quiescent Current: 8A Operating, 6A The LTC 4380 low quiescent current surge stopper protects
Shutdown loads from high voltage transients. Overvoltage protection
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Withstands Surge Voltage Up to the MOSFET Limit is provided by clamping the gate voltage of an external
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Wide Operating Voltage Range: 4V to 72V N-channel MOSFET to limit the output voltage to a safe
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Overcurrent Protection value during overvoltage events such as load dump in
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Selectable Internal 31.5V/50V or Adjustable Gate automobiles. Fixed gate clamp voltages are selectable for
Clamp Voltage (Table 1) 12V and 24V/28V systems. For systems of any voltage up
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Reverse Input Protection to 60V to 72V, use the adjustable gate clamp versions. Overcur-
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Adjustable Turn-On Threshold rent protection is also provided.
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Adjustable Fault Timer with MOSFET Stress
An internal multiplier generates a TMR pin current pro-
Acceleration
portional to V and I , so that operating time in both
DS D
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Controls N-Channel MOSFET
overcurrent and overvoltage conditions is limited in ac-
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Latchoff and Retry Options (Table 1)
cordance with MOSFET stress.
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Low Retry Duty Cycle During Faults (Table 1)
n The GATE pin can drive back-to-back MOSFETs for reverse
10-Pin DFN (3mm 3mm) and MSOP Packages
input protection, eliminating the voltage drop and dissi-
pation of a Schottky diode solution. A low 8A operating
a T
current permits use in always-on and battery powered
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Automotive/Avionic/Industrial Surge Protection
applications. An accurate ON pin comparator monitors
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Hot Swap/ Live Insertion
the input supply for undervoltage (UV) conditions and
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High Side Switch for Battery Powered Systems
also serves as a shutdown input, reducing the quiescent
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Intrinsic Safety Applications
current to 6A.
L, LT, LTC, LTM, Linear Technology, the Linear logo and LTspice are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical a T
12V, 1A with 250V Overvoltage Protection Surge Stopper Limits Output to 27V During Input Surge
20m
FDB33N25 12V/1A
V C = 8.2F
IN TMR
100V INPUT SURGE
OUTPUT CLAMPED
12V I = 1A
LOAD
AT 27V
(250V )
22F
PK
10
33
249k
10k
47nF
V
IN
DRN GATE SNS OUT
20V/DIV
12V
V
CC
LTC4380-2
FLT V
OUT
0.1F 12V
ON
20V/DIV
GND TMR SEL
27V ADJUSTABLE CLAMP
68V
8.2F
CMHZ5266B
4380 TA01b
100ms/DIV
4380 TA01a
4380f
1
For more information www.linear.com/LTC4380
ion pplica
ions pplica
ion uresLTC4380
a T e Maxi Mu M r a T (Notes 1, 2)
V , ON, SEL ............................................... 60V to 80V FLT ............................................................. 0.3V to 80V
CC
DRN (Note 3), SNS, OUT I .......................................................................2.5mA
DRN
LTC4380-1/LTC4380-2........................... 0.3V to 53V Operating Ambient Temperature Range
LTC4380-3/LTC4380-4 .......................... 0.3V to 80V LTC4380C ................................................ 0C to 70C
SNS to OUT ..................................................... 5V to 5V LTC4380I .............................................40C to 85C
GATE (Note 4) LTC4380H .......................................... 40C to 125C
LTC4380-1/LTC4380-2........................... 0.3V to 53V Storage Temperature Range .................. 65C to 150C
LTC4380-3/LTC4380-4 .......................... 0.3V to 86V Lead Temperature (Soldering, 10 sec)
GATE to OUT, V (Note 4) ......................... 0.3V to 10V MSOP ...............................................................300C
CC
TMR ............................................................. 0.3V to 5V
p c F T
TOP VIEW
TOP VIEW
DRN 1 10 TMR
DRN 1 10 TMR
V 2 9 ON
CC
V 2 9 ON
11
CC
GATE 3 8 GND
GATE 3 8 GND
GND
SNS 4 7 FLT SNS 4 7 FLT
OUT 5 6 SEL
OUT 5 6 SEL
MS PACKAGE
10-LEAD PLASTIC MSOP
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 160C/W
JMAX JA
T = 135C, = 43C/W
JMAX JA
EXPOSED PAD (PIN 11) IS GND, PCB CONNECTION OPTIONAL
o r D i n F Ma T