LTC4360-2_15 Datasheet, PDF (1/14 Pages) Linear Technology – Overvoltage Protection Controller

FEATURES
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}
APPLICATIONS
n _{USB Protection}
n _{Handheld Computers}
n _{Cell/Smart Phones}
n _{MP3/MP4 Players}
n _{Digital Cameras}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT, PowerPath, How Swap and No R_SENSE are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Protection from Overvoltage
V_IN
Si1470DH
5V
GATE
IN
OUT
LTC4360-1
V_OUT
5V
1.5A
C_OUT
ON PWRGD
GND
436012 TA01a
LTC4360-1/LTC4360-2
Overvoltage Protection
Controller
DESCRIPTION
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
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
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
V_IN
V_IN, V_OUT
5V/DIV
V_GATE
10V/DIV
V_OUT
Si1470DH
C_OUT = 10µF
0.5µs/DIV
436012 TA01b
436012fa
1