LTC1642AIGN Просмотр технического описания (PDF) - Linear Technology
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LTC1642AIGN Datasheet PDF : 16 Pages
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LTC1642A
Hot Swap Controller
FEATURES
■ Adjustable Undervoltage and Overvoltage
Protection
■ Foldback Current Limit
■ Adjustable Current Limit Time-Out
■ VCC: 2.97V to 16.5V Normal Operation, Protected
Against Surges to 33V
■ Single Channel NFET Driver
■ Latch Off or Automatic Retry on Current Fault
■ Driver for SCR Crowbar on Overvoltage
■ Adjustable Reset Timer
■ Reference Output with Uncommitted Comparator
■ 16-Pin SSOP Package
U
APPLICATIO S
■ Hot Board Insertion
■ Electronic Circuit Breaker
■ InfiniBandTM Systems
DESCRIPTIO
The LTC®1642A is a 16-pin Hot SwapTM 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 an
adjustable rate. A high side switch driver controls the
N-Channel gate for supply voltages ranging from 2.97V
to 16.5V.
The SENSE pin allows foldback limiting of the load current,
with circuit breaker action after an adjustable delay time.
The delay allows the part to power-up in current limit. The
CRWBR output can be used to trigger an SCR for crowbar
protection of the load if the input supply exceeds an
adjustable threshold. The RESET output can generate a
system reset with adjustable delay when the supply volt-
age falls below an adjustable threshold. The ON pin cycles
the board power. The LTC1642A is available in the 16-pin
SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Hot Swap is a trademark of Linear
Technology Corporation.
TYPICAL APPLICATIO
BACKPLANE
12V
PLUG-IN CARD
(SHORT PIN) 110k
1%
0.010Ω
5%
FDS6630A
100Ω
5%
1N4705
18V
330Ω
5%
0.047µF
UV = 10.8V
2.87k
1%
OV = 13.2V
11.3k
1%
GND
VCC
SENSE
GATE
RESET
FB
ON
LTC1642A
FAULT
OV
GND BRK TMR
RST TMR
CRWBR
COMP–
COMP+
COMPOUT
REF
2N2222
0.33µF
0.33µF
0.1µF
0.01µF
12V
+
AT 2.5A
CLOAD
107k
1%
POWER-GOOD = 11.4V
MCR
12DC
13k
1%
1642a TA01
1642af
1
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