Linear Technology LTC4361-1/LTC4361-2 Overvoltage/Overcurrent Protection Controller with Latchoff/Auto-Retry DC1506A DC1506A 数据表
产品代码
DC1506A
LTC4361-1/LTC4361-2
1
436112fb
Typical applicaTion
DescripTion
Overvoltage/Overcurrent
Protection Controller
applicaTions
n
USB Protection
n
Handheld Computers
n
Cell/Smart Phones
n
MP3/MP4 Players
n
Digital Cameras
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
10% Accurate 50mV Overcurrent Circuit Breaker
n
<1µs Overvoltage Turn-Off, Gentle Shutdown
n
Controls N-Channel MOSFET
n
Adjustable Power-Up dV/dt Limits Inrush Current
n
Reverse Voltage Protection
n
Power Good Output
n
Low Current Shutdown
n
Latchoff (LTC4361-1) or Auto-Retry (LTC4361-2)
After Overcurrent
n
Available in 8-Lead ThinSOT™ and 8-Lead
(2mm
× 2mm) DFN Packages
The LTC
®
4361 overvoltage/overcurrent protection control-
ler safeguards 2.5V to 5.5V systems from input supply
overvoltage. It is designed for portable devices with
multiple power supply options including wall adaptors,
car battery adaptors and USB ports.
The LTC4361 controls an external N-channel MOSFET in
The LTC4361 controls an external N-channel MOSFET in
series with the input power supply. During overvoltage
transients, the LTC4361 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
LTC4361 provides protection from transients up to 80V
without requiring transient voltage suppressors or other
external components.
The LTC4361 has a delayed start-up and adjustable dV/dt
The LTC4361 has a delayed start-up and adjustable dV/dt
ramp-up for inrush current limiting. A PWRGD pin provides
power good monitoring for V
IN
. The LTC4361 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 LTC4361 automati-
cally restarts with a start-up delay. After an overcurrent
fault, the LTC4361-1 remains off while the LTC4361-2
automatically restarts after a 130ms start-up delay.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT, Hot Swap, No R
SENSE
and PowerPath are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
Output Protected from Overvoltage at Input
Protection from Overvoltage and Overcurrent
GATE
Si1470DH
0.025Ω
SENSE
IN
IN
436112 TA01a
V
OUT
5V
1.5A
V
IN
5V
LTC4361
ON
OUT
PWRGD
GND
C
OUT
V
GATE
10V/DIV
V
IN
, V
OUT
5V/DIV
0.5µs/DIV
436112 TA01b
Si1470DH
C
OUT
= 10µF
V
OUT
V
IN
FeaTures