Linear Technology LTC4360-1/LTC4360-2 Overvoltage Protection Controller with Shutdown/Reverse Voltage Protection DC1505A DC1505A 数据表
产品代码
DC1505A
LTC4360-1/LTC4360-2
1
436012fa
TYPICAL APPLICATION
DESCRIPTION
Overvoltage Protection
Controller
The LTC
®
4360 overvoltage protection controller 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 LTC4360 controls an external N-channel MOSFET in
The LTC4360 controls an external N-channel MOSFET in
series with the input power supply. During overvoltage
transients, the LTC4360 turns off the MOSFET within 1µs,
isolating downstream components from the input supply.
Inductive cable transients are absorbed by the MOSFET
and load capacitance. In most applications, the LTC4360
provides protection from transients up to 80V without
requiring transient voltage suppressors or other external
components.
The LTC4360 has a delayed start-up and an adjustable dV/dt
The LTC4360 has a delayed start-up and an adjustable dV/dt
ramp-up for inrush current limiting. A PWRGD pin provides
power good monitoring for V
IN
. Following an overvolt-
age condition, the LTC4360 automatically restarts with a
start-up delay. The LTC4360-1 features a soft shutdown
controlled by the ON pin, while the LTC4360-2 controls an
optional external P-channel MOSFET for negative voltage
protection.
Output Protected from Overvoltage at Input
FEATURES
APPLICATIONS
n
2.5V to 5.5V Operation
n
Overvoltage Protection Up to 80V
n
No Input Capacitor or TVS Required for Most
Applications
n
2% Accurate 5.8V Overvoltage Threshold
n
<1µs Overvoltage Turn-Off, Gentle Shutdown
n
Controls N-Channel MOSFET
n
Adjustable Power-Up dV/dt Limits Inrush
n
Reverse Voltage Protection (LTC4360-2)
n
Power Good Output
n
Low Current Shutdown (LTC4360-1)
n
Available in a Tiny 8-Lead SC70 Package
n
USB Protection
n
Handheld Computers
n
Cell/Smart Phones
n
MP3/MP4 Players
n
Digital Cameras
GATE
Si1470DH
IN
436012 TA01a
V
OUT
5V
1.5A
V
IN
5V
LTC4360-1
ON
OUT
PWRGD
GND
C
OUT
Protection from Overvoltage
V
GATE
10V/DIV
V
IN
, V
OUT
5V/DIV
0.5µs/DIV
436012 TA01b
Si1470DH
C
OUT
= 10µF
V
OUT
V
IN
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
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SENSE
are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.