1

LTC1422

Hot Swap Controller

s

Allows Safe Board Insertion and Removal

from a Live Backplane

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System Reset Output with Programmable Delay

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Programmable Electronic Circuit Breaker

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User-Programmable Supply Voltage Power-Up Rate

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High Side Driver for an External N-Channel FET

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Controls Supply Voltages from 2.7V to 12V

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Undervoltage Lockout

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Soft Reset Input

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Glitch Filter on RESET

5V Hot Swap

The LTC

allows a board to be safely inserted and removed from a

live backplane. Using an external N-channel pass transis-

tor, the board supply voltage can be ramped up at a

programmable rate. A high side switch driver controls the

N-channel gate for supply voltages ranging from 2.7V to

12V.

A programmable electronic circuit breaker protects

against shorts. The RESET output can be used to generate

a system reset when the supply voltage falls below a

programmable voltage. The ON pin can be used to cycle

the board power or to generate a soft reset.

The LTC1422 is available in 8-pin PDIP and SO packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Hot Swap is a trademark of Linear Technology Corporation.

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Hot Board Insertion

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Electronic Circuit Breaker

+

SENSE GATE

LTC1422

GND

TIMER

ON

8

34

76

R2

10

Ω

5%

R3

6.81k

1%

R4

2.43k

1%

R1

0.005

Ω

Q1

MTB50N06V

C1

0.1

µF

5V

ON/RESET

GND

1422 TA01

PLUG-IN CARD

BACKPLANE

C2

0.33

µF

5

2

1

FB

RESET

RESET

µP

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO