LTC4366

436612fe

1

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

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

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners. Patents pending.

OUT

2nF

GATE

IXTK90N25L2

SD

FB

1µF

0.47µF

12.4k

1.5A

28V

422k

436612 TA01a

46.4k

10

324k

LTC4366-2

TIMER

BASE

28V

100ms/DIV

436612 TA01b

28V

43V CLAMP

250V INPUT SURGE

100V/DIV

20V/DIV