LTC1422_15 Datasheet, PDF (1/16 Pages) Linear Technology – Hot Swap Controller

LTC1422
Hot Swap Controller
FEATURES
s _{Allows Safe Board Insertion and Removal}
from a Live Backplane
s _{System Reset Output with Programmable Delay}
s _{Programmable Electronic Circuit Breaker}
s _{User-Programmable Supply Voltage Power-Up Rate}
s _{High Side Driver for an External N-Channel FET}
s _{Controls Supply Voltages from 2.7V to 12V}
s _{Undervoltage Lockout}
s _{Soft Reset Input}
s _{Glitch Filter on RESET}
s _{Available in 8-Pin Narrow PDIP and SO Packages}
U
APPLICATIO S
s _{Hot Board Insertion}
s _{Electronic Circuit Breaker}
DESCRIPTIO
The LTC^®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.
TYPICAL APPLICATIO
5V Hot Swap
R1
Q1
0.005Ω MTB50N06V
V_CC
ON/RESET
GND
R2
10Ω
5%
8
76
2 ^VCC
SENSE GATE
5
ON
FB
LTC1422
1
RESET
TIMER GND
3
4
C2
0.33µF
BACKPLANE PLUG-IN CARD
C1
0.1µF
R3
6.81k
1%
+
V_OUT
5V
C_LOAD
R4
2.43k
1%
µP
RESET
1422 TA01
1422fb
1