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LTC4362IDCB-2-TRMPBF

Description
1.2A Overvoltage/ Overcurrent Protector
File Size288KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC4362IDCB-2-TRMPBF Overview

1.2A Overvoltage/ Overcurrent Protector

LTC4362-1/LTC4362-2
1.2A Overvoltage/
Overcurrent Protector
FEATURES
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DESCRIPTION
The LTC
®
4362 monolithic overvoltage/overcurrent protec-
tor safeguards 2.5V to 5.5V systems from power supply
overvoltage. It is designed for portable devices with multiple
power supply options including wall adaptors, car battery
adaptors and USB ports.
The LTC4362 controls an internal 40mΩ N-channel MOSFET
in series with the input power supply. During overvoltage
transients, the LTC4362 turns off the MOSFET within 1μs,
isolating downstream components from the input supply.
In most applications, the LTC4362 rides through induc-
tive cable transients without requiring transient voltage
suppressors or other external components. An internal
current sense resistor is used to implement overcurrent
protection.
The LTC4362 has a delayed start-up at plug-in and con-
trolled dV/dt ramp-up for inrush current limiting. A
PWRGD
pin provides power good monitoring for V
IN
. The LTC4362
features a soft-shutdown controlled by the
ON
pin and
drives an optional external P-channel MOSFET for negative
voltage protection. Following an overvoltage condition, the
LTC4362 automatically restarts with a 130ms delay. After
an overcurrent fault, the LTC4362-1 remains off while the
LTC4362-2 automatically restarts after a 130ms delay.
2.5V to 5.5V Operation
Overvoltage Protection Up to 28V
Internal 40mΩ N-Channel MOSFET and 31mΩ R
SENSE
Avalanche Rated MOSFET Requires No Input
Capacitor or TVS for Most Applications
<1μs
Overvoltage Turn-Off, Gentle Shutdown
2% Accurate 5.8V Overvoltage Threshold
20% Accurate 1.5A Overcurrent Threshold
Input Withstands Up to ±25kV HBM ESD with 1μF C
OUT
Controlled Power-Up dV/dt Limits Inrush Current
Reverse Voltage Protection Driver
Low Current Shutdown
Latchoff (LTC4362-1) or Auto-Retry (LTC4362-2)
After Overcurrent
Available in 8-Lead DFN 2mm
×
3mm Package
APPLICATIONS
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USB Protection
Handheld Computers
Cell/Smart Phones
MP3/MP4 Players
Digital Cameras
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT, PowerPath and Hot Swap are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Protection from Overvoltage and Overcurrent
V
IN
5V
V
OUT
5V
0.5A
Output Protected from Overvoltage at Input
V
IN
IN
OUT
LTC4362
C
OUT
ON
PWRGD
GND
436212 TA01a
V
OUT
V
IN
, V
OUT
5V/DIV
0.2μs/DIV
C
OUT
= 10μF
436212 TA01b
436212f
1

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Description 1.2A Overvoltage/ Overcurrent Protector 1.2A Overvoltage/ Overcurrent Protector 1.2A Overvoltage/ Overcurrent Protector 1.2A Overvoltage/ Overcurrent Protector 1.2A Overvoltage/ Overcurrent Protector 1.2A Overvoltage/ Overcurrent Protector 1.2A Overvoltage/ Overcurrent Protector 1.2A Overvoltage/ Overcurrent Protector
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