Final Electrical Specifications
LTC1642
Hot Swap Controller
May 1999
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
Single Channel Positive NFET Driver
Programmable Undervoltage and Overvoltage
Protection
Foldback Current Limit
Adjustable Current Limit Time-Out
Latch Off or Automatic Retry on Current Fault
Driver for SCR Crowbar on Overvoltage
Programmable Reset Timer
Reference Output with Uncommitted Comparator
V
CC
: 2.97V to 16.5V Normal Operation, Protected
Against Surges to 33V.
16-Pin SSOP Package
The LTC
廬
1642 is a 16-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 2.97V to
16.5V.
The SENSE pin allows foldback limiting of the load current,
with circuit breaker action after a programmable 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 load protection after a programmable delay if
the input supply exceeds a programmable voltage. The
RESET output can be used to generate a system reset with
programmable delay when the supply voltage falls below
a programmable voltage. The ON pin can be used to cycle
the board power. The LTC1642 is available in the 16-pin
SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
Hot Board Insertion
Electronic Circuit Breaker
TYPICAL APPLICATIO
12V
R5
110k
1%
LATCH OFF: FLOAT FAULT
AUTOMATIC RETRY: TIE FAULT TO ON
R1
0.010鈩?/div>
5%
C7
0.1碌F
Q1
FDR9410A
R2
100鈩?/div>
5%
16
15
SENSE
14
GATE
R8
330鈩?/div>
5%
C1
0.047碌F
RESET
5
7
1
12
Q2
2N2222
Q3
MCR
12DC
V
CC
10
UNDERVOLTAGE = 10.8V
R6
2.87k
1%
OVERVOLTAGE = 13.2V
R7
11.3k
1%
D1
1N4148
4
6
9
COMPOUT
ON
FAULT
OV
GND
8
BRK TMR
2
C3
0.33碌F
LTC1642
FB
CRWBR
COMP
鈥?/div>
11
COMP
+
REF
RST TMR
C5
3
C2 0.1碌F
0.33碌F
13
RESET TIME = 200ms
CURRENT LIMIT TIME = 20ms
CROWBAR TIME = 90碌s
C6
0.01碌F
R9 REQUIRED ONLY WITH SENSITIVE GATE SCRs,
NOT NEEDED WITH MCR12
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
+
12V
AT 2.5A
C
LOAD
R3
107k
1%
POWER-GOOD = 11.4V
R9
220鈩?/div>
5%
R4
13k
1%
1642 TA01
U
U
1
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