LTC1422
Hot Swap Controller
FEATURES
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DESCRIPTIO
Allows Safe Board Insertion and Removal
from a Live Backplane
System Reset Output with Programmable Delay
Programmable Electronic Circuit Breaker
User-Programmable Supply Voltage Power-Up Rate
High Side Driver for an External N-Channel FET
Controls Supply Voltages from 2.7V to 12V
Undervoltage Lockout
Soft Reset Input
Glitch Filter on RESET
The LTC
廬
1422 is an 8-pin Hot Swap
TM
controller that
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.
APPLICATIO S
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Hot Board Insertion
Electronic Circuit Breaker
TYPICAL APPLICATIO
5V Hot Swap
Q1
R1
0.005鈩?MTB50N06V
V
CC
R2
10鈩?/div>
5%
R3
6.81k
1%
C1
0.1碌F
5
R4
2.43k
1%
V
OUT
5V
C
LOAD
+
CONNECTOR 2
CONNECTOR 1
8
2
V
CC
ON
7
6
FB
SENSE GATE
ON/RESET
LTC1422
RESET
TIMER
3
GND
C2
0.33碌F
4
1
碌P
RESET
GND
1422 TA01
BACKPLANE
PLUG-IN CARD
U
U
U
1
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