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LTC4381 Datasheet

Low Quiescent Current Surge Stopper

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LTC4381
Low Quiescent Current Surge
Stopper with 9mΩ MOSFET
FEATURES
n Withstands Surge Voltages Up to 100V
n Internal 9mΩ N-Channel MOSFET
n Guaranteed Safe Operating Area: 20ms at 70V, 1A
n Low Quiescent Current: 6µA Operating
n Operates Through Automobile Cold Crank
n Wide Operating Voltage Range: 4V to 72V
n Overcurrent Protection
n Selectable Internal 28.5V/47V or Adjustable Output
Clamp Voltage (Table 1)
n Reverse Input Protection to –60V
n Adjustable Turn-On Threshold
n Adjustable Fault Timer with MOSFET Stress
Acceleration
n Latchoff and Retry Options (Table 1)
n Low Retry Duty Cycle During Faults (Table 1)
n 32-Lead DFN (7mm × 5mm) Package
APPLICATIONS
n Automotive 12V, 24V and 48V System
n Avionic/Industrial Surge Protection
n Hot Swap/Live Insertion
n High Side Switch for Battery Powered Systems
n Automotive Load Dump Protection
DESCRIPTION
The LTC®4381 is an integrated solution for low quiescent
current surge stopper applications that protect loads from
high voltage transients. Overvoltage protection is pro-
vided by clamping the gate voltage of an internal 9mΩ
N-channel MOSFET to limit the output voltage to a safe
value during overvoltage events such as load dump in
automobiles. The MOSFET safe operating area is pro-
duction tested and guaranteed for the stresses during
high voltage transients. Fixed output clamp voltages are
selectable for 12V and 24V/28V systems. For systems of
any voltage up to 80V, use the adjustable clamp versions.
Overcurrent protection is also provided. An internal mul-
tiplier generates a TMR pin current proportional to VDS
and ID, so that operating time in both overcurrent and
overvoltage conditions is limited in accordance with
MOSFET stress.
The GATE pin can drive back-to-back MOSFETs for
reverse input protection, eliminating the voltage drop
and dissipation of a Schottky diode solution. A low 6µA
operating current permits use in always-on and battery
powered applications.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
12V System with 100V/0.5A/400ms Load Dump Overvoltage Protection
VIN
12V
(100VPK) 20k
0.1µF
200k
68V
CMHZ5266B
80mΩ
IN
SRC
DRN
SNS
VCC
OUT
ON
LTC4381-2
10Ω
GFET
SEL
GATE
12V/0.5A
OUTPUT
CLAMPED
AT 28.5V
22µF
FLT
33Ω
TMR
10µF
GND
4381 TA01a
47nF
12V, 0.5A with 100V Overvoltage Protection
100V INPUT SURGE
ILOAD = 0.5A
VIN
20V/DIV
12V
VOUT 12V
20V/DIV
100ms/DIV
4381 TA01b
Rev. 0
Document Feedback
For more information www.analog.com
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC4381 Datasheet

Low Quiescent Current Surge Stopper

No Preview Available !

LTC4381
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
IN (Note 5)................................................ –0.3V to 100V
VCC, ON, SEL................................................ –60V to 80V
DRN (Note 3), SNS, OUT, SRC
LTC4381-1/LTC4381-2............................ –0.3V to 53V
LTC4381-3/LTC4381-4............................ –0.3V to 80V
SNS to OUT...................................................... –5V to 5V
GATE, GFET (Note 4)
LTC4381-1/LTC4381-2............................ –0.3V to 53V
LTC4381-3/LTC4381-4............................ –0.3V to 86V
GATE to OUT, GATE to VCC,
GFET to SRC (Note 4)............................. –0.3V to 10V
TMR.............................................................. –0.3V to 5V
FLT.............................................................. –0.3V to 80V
IDRN........................................................................2.5mA
Operating Junction Temperature Range
LTC4381C................................................. 0°C to 70°C
LTC4381I..............................................–40°C to 85°C
LTC4381H........................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
TMR 1
ON 2
GND 3
DRN 4
NC 5
VCC 6
IN 7
SRC 8
SRC 9
SRC 10
SRC 11
SRC 12
SRC 13
SRC 14
SRC 15
SRC 16
32 SEL
31 FLT
30 OUT
29 SNS
28 NC
27 GATE
26 GFET
33
25 IN
IN
24 SRC
23 SRC
22 SRC
21 SRC
20 SRC
19 SRC
18 SRC
17 SRC
DKE PACKAGE
32-LEAD (7mm × 5mm) PLASTIC DFN
TJMAX = 150°C, θJA = 23°C/W
EXPOSED PAD (PIN 33) IS IN
ORDER INFORMATION
TUBE
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4381CDKE-2#PBF
LTC4381CDKE-2#TRPBF
43812
32-Lead (7mm × 5mm) Plastic DFN 0°C to 70°C
LTC4381IDKE-2#PBF
LTC4381IDKE-2#TRPBF
43812
32-Lead (7mm × 5mm) Plastic DFN –40°C to 85°C
LTC4381HDKE-2#PBF
LTC4381HDKE-2#TRPBF
43812
32-Lead (7mm × 5mm) Plastic DFN –40°C to 125°C
LTC4381CDKE-4#PBF
LTC4381CDKE-4#TRPBF
43814
32-Lead (7mm × 5mm) Plastic DFN 0°C to 70°C
LTC4381IDKE-4#PBF
LTC4381IDKE-4#TRPBF
43814
32-Lead (7mm × 5mm) Plastic DFN –40°C to 85°C
LTC4381HDKE-4#PBF
LTC4381HDKE-4#TRPBF
43814
32-Lead (7mm × 5mm) Plastic DFN –40°C to 125°C
Contact ADI Sales for LTC4381-1/LTC4381-3 option. Contact ADI Sales for parts specified with wider operating temperature ranges. *The temperature
grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. 0
2
For more information www.analog.com


Part Number LTC4381
Description Low Quiescent Current Surge Stopper
Maker Analog Devices
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LTC4381 Datasheet PDF






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