LTC4366

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1

Rev. F

TYPICAL APPLICATION

FEATURES

DESCRIPTION

High Voltage Surge Stopper

The LTC®4366 surge stopper protects loads from high

voltage transients. By controlling the gate of an external

N-channel MOSFET, the LTC4366 regulates the output

during an overvoltage transient. The load may remain

operational while the overvoltage is dropped across the

MOSFET. Placing a resistor in the return line isolates the

LTC4366andallowsittofloatupwiththesupply;therefore,

the upper limit on the output voltage depends only on the

availability of high valued resistors and MOSFET ratings.

An adjustable overvoltage timer prevents MOSFET dam-

age during the surge while an additional 9-second timer

provides for MOSFET cool down. A shutdown pin reduces

the quiescent current to less than 14µA during shutdown.

AfterafaulttheLTC4366-1latchesoffwhiletheLTC4366-2

will auto-retry.

Overvoltage Protected 1.5A, 28V Supply

Overvoltage Protector Regulates Output at 43V During Transient

APPLICATIONS

n

Rugged Floating Topology

n

Wide Operating Voltage Range: 9V to >500V

n

Adjustable Output Clamp Voltage

n

Controls N-Channel MOSFET

n

Adjustable Protection Timer

n

Internal 9-Second Cool-Down Timer

n

Shutdown IQ < 14µA

n

8-Lead TSOT and 3mm × 2mm DFN Packages

n

Industrial, Automotive and Avionic Surge Protection

n

High Voltage DC Distribution

n

28V Vehicle Systems

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VDD

OUT

2nF

GATE

IXTK90N25L2

SD

FB

1µF

0.47µF

12.4k

VOUT

1.5A

VIN

28V

422k

436612 TA01a

46.4k

10

324k

LTC4366-2

TIMER

BASE

VSS

28V

100ms/DIV

436612 TA01b

28V

43V CLAMP

250V INPUT SURGE

VIN

100V/DIV

VOUT

20V/DIV

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