LINEAR TECHNOLOGY LT4356-1, LT4356-2, LT4356-3 Technical data
Overvoltage Surge Protectors
LT4356-1
LT4356-2
LT4356-3
LT4356 Surge Stopper, Regulates Overvoltage and Overcurrent Surges
V
IN
12V
383k
100k
UNDERVOLTAGE
V
CC
SHDN
+
IN
A
OUT
10m
IRFR2407
LT4356
GND TMR
Features
n
Wide Operating Range: 4V to 80V
n
Adjustable Output Clamp Voltage
n
Reverse Input Protection to –60V
n
Adjustable Fault Timer
n
Overcurrent Protection
n
Inrush Limiting
n
Auxiliary Amplifier
n
–40°C to 125°C Operation
V
OUT
IN
80V INPUT SURGE
12V
16V CLAMP
12V
100ms/DIV
LT4356-2
10
OUTGATESNS
0.1µF
FLT
59k
V
FB
4.99k
EN
FAULT
V
CC
DC-DC
CONVERTER
SHDN
GND
20V/DIV
V
OUT
20V/DIV
LT4356-1
Shutdown Current 7µA 60µA 7µA
Aux. Amp in Shutdown OFF ON OFF
Fault Retry Retry Retry Latchoff
Temperature Grades C, I, H, MP C, I, H, MP C, I, H
Packages
4 × 3 DFN-12
MSOP-10
4 × 3 DFN-12
SO-16
SO-16
LT4356-3
4 × 3 DFN-12
MSOP-10
SO-16
LTC4365 UV, OV and Reverse Supply Protection Controller
VIN OPERATING RANGE:
PROTECTS 60V TO –40V
NO TVS REQUIRED
Features
n
Low Operating Current: 125µA
n
Low Shutdown Current: 10µA
n
Blocks 50Hz and 60Hz AC Power
n
–40°C to 125°C Operation
n
8-Lead, 3mm × 2mm DFN and TSOT-23 Packages
2.5V TO 34V
ADJUSTABLE
0V/UV THRESHOLDS
V
IN
SHDN
UV
OV
GATE
LTC4365
GND
V
OUT
FAULT
V
OUT
Valid
Window
10V/DIV
–30V
30V
GND
UV = 3.5V
OV = 18V
V
OUT
V
IN
1s/DIV
V
IN
V
OUT
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.
www.linear.com/4356
LTC4360/LTC4361/LTC4362 Overvoltage/Overcurrent Protection Controllers
LTC4360-1
Overvoltage
Protection
Controller
LTC4360-2
Overvoltage
Protection
Controller
LTC4361-1/-2
Overvoltage/
Overcurrent
Protection
Controller
LTC4362-1/-2
Overvoltage/
Overcurrent
Protector
V
OUT
5V
1.5A
C
OUT
, V
V
IN
5V/DIV
V
10V/DIV
OUT
GATE
Overvoltage at Input
V
IN
V
OUT
0.5µs/DIV
NO TVS REQUIRED
0.025Ω
V
IN
5V
SENSE
IN
ON
Si1470DH
GATE
OUT
LTC4361
PWRGD
GND
The LTC®4360/LTC®4361/LTC®4362 are overvoltage protection devices designed to safeguard low voltage, portable electronics from
damaging input voltage transients and current surges. The LTC4360/LTC4361 utilize a 2% accurate 5.8V overvoltage threshold to
detect an overvoltage event and responds within 1µs to isolate the downstream components from the input. Overvoltage protection
of up to 80V can be achieved with this simple IC/MOSFET solution without the need for additional protection components. In
addition the LTC4361 offers a 10% accurate overcurrent circuit breaker. The LTC4362 is a 1.2A overvoltage/overcurrent protector
that includes an internal 40mΩ N-channel MOSFET and current sense resistor in series with the input power supply. All three
products offer a GATEP output pin for controlling an additional P-channel MOSFET to provide negative input voltage protection.
Output Protected from
Applications
n
USB Protection
n
Cell/Smart Phones
n
MP3/MP4 Players
n
Digital Cameras
Input Voltage Range 2.5V to 80V 2.5V to 80V 2.5V to 80V 2.5V to 28V
LTC4360-1
Overvoltage
Protection
Controller
LTC4360-2
Overvoltage
Protection
Controller
LTC4361-1/-2
Overvoltage/
Overcurrent
Protection
Controller
LTC4362-1/-2
Overvoltage/
Overcurrent
Protector
Overvoltage Trip Level 5.8V 5.8V 5.8V 5.8V
N-Channel MOSFET External External External Internal,
40m Switch
Reverse Voltage Protection No Yes Yes Yes
Overcurrent Protection No No Yes,
Yes, 1.5A
Adjustable
Overcurrent Fault Retry – – Latchoff/
Auto-Retry
Latchoff/
Auto-Retry
Low Current Shutdown Yes No Yes Yes
Power Good Output Yes Yes Yes Yes
Packages SC70-8 SC70-8 TSOT-8
2 × 3 DFN-8
2 × 2 DFN-8
WALL ADAPTOR
AC/DC
www.linear.com/4356 n 1-800-4-LINEAR
R
+
L
CABLE
IN
IN
LTC4362
GND
OUT
OUTIN
IN
MOBILE DEVICE
C
OUT
LOAD
0710A
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