LTC4365
1
4365f
TYPICAL APPLICATION
FEATURES DESCRIPTION
UV, OV and Reverse
Supply Protection Controller
12V Automotive Application
APPLICATIONS
n
Wide Operating Voltage Range: 2.5V to 34V
n
Overvoltage Protection to 60V
n
Reverse Supply Protection to –40V
n
Blocks 50Hz and 60Hz AC Power
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
Fault Status Output
n
Compact 8-Lead, 3mm × 2mm DFN and
TSOT-23 (ThinSOT™) Packages
n
Portable Instrumentation
n
Industrial Automation
n
Laptops
n
Automotive
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT, No R
SENSE
and Hot Swap are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
V
IN
UV
OV
SHDN
OV = 18V
UV = 3.5V
4365 TA01a
V
OUT
FAULT
GATE
V
IN
12V
V
OUT
3A
Si4946
GND
LTC4365
510k
1820k
243k
59k
Load Protected from Reverse and Overvoltage at V
IN
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
overvoltage (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.
–30V
GND
10V/DIV
30V
4365 TA01b
1s/DIV
UV = 3.5V
OV = 18V
V
OUT
V
OUT
V
IN
V
IN
VALID
WINDOW
