LTC4365_15 Datasheet, PDF (1/20 Pages) Linear Technology – Overvoltage, Undervoltage and Reverse Supply Protection Controller

LTC4365
Features
Overvoltage,
Undervoltage and Reverse
Supply Protection Controller
Description
n _{Wide Operating Voltage Range: 2.5V to 34V}
n _{Overvoltage Protection to 60V}
n _{Reverse Supply Protection to –40V}
n _{LTC4365: Blocks 50Hz and 60Hz AC Power}
n _{LTC4365-1: Fast (1ms) Recovery from Fault}
n _{No Input Capacitor or TVS Required for Most}
Applications
n _{Adjustable Undervoltage and Overvoltage}
Protection Range
n _{Charge Pump Enhances External N-Channel MOSFET}
n _{Low Operating Current: 125µA}
n _{Low Shutdown Current: 10µA}
n _{Compact 8-Lead, 3mm × 2mm DFN and}
TSOT-23 (ThinSOT™) Packages
Applications
n _{Portable Instrumentation}
n _{Industrial Automation}
n _Laptops
n _{Automotive Surge Protection}
The LTC^®4365 protects applications where power supply
input voltages may be too high, too low or even negative.
It does this by controlling the gate voltages of a pair of
external N-channel MOSFETs to ensure that the output
stays within a safe operating range.The LTC4365 can
withstand voltages between –40V and 60V and has an
operating range of 2.5V to 34V, while consuming only
125µA in normal operation.
Two comparator inputs allow configuration of the over-
voltage (OV) and undervoltage (UV) set points using an
external resistive divider. A shutdown pin provides external
control for enabling and disabling the MOSFETs as well
as placing the device in a low current shutdown state. A
fault output provides status of the gate pin pulling low. A
fault is indicated when the part is in shutdown or the input
voltage is outside the UV and OV set points.
The LTC4365 has a 36ms turn-on delay that debounces
live connections and blocks 50Hz to 60Hz AC power. For
fast recovery after faults, the LTC4365-1 has a reduced
1ms turn-on delay.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Typical Application
12V Automotive Application
V_IN
Si4946
V_OUT
12V
3A
Load Protected from Reverse and Overvoltage at V_IN
UV = 3.5V
30V OV = 18V
V_IN
GATE
V_IN
V_OUT
510k
LTC4365
1820k
SHDN
UV
FAULT
243k
OV
59k
GND
OV = 18V
UV = 3.5V
4365 TA01a
VALID
WINDOW
GND
V_OUT
10V/DIV
V_IN
–30V
For more information www.linear.com/LTC4365
V_OUT
1s/DIV
4365 TA01b
4365fa
1