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參數(shù)資料
| 型號： | LTC1642I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 8-Bit, 40 MSPS ADC Single Ch., Internal S&H, Low Power 24-TSSOP 0 to 70 |
| 中文描述： | 熱插拔控制器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 147K |
| 代理商： | LTC1642I |
1
LTC 1642
Hot Swap C ontroller
May 1999
Final Electrical Specifications
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.
DESCRIPTIO
The LTC
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.
U
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.
I
Single Channel Positive NFET Driver
I
Programmable Undervoltage and Overvoltage
Protection
I
Foldback Current Limit
I
Adjustable Current Limit Time-Out
I
Latch Off or Automatic Retry on Current Fault
I
Driver for SCR Crowbar on Overvoltage
I
Programmable Reset Timer
I
Reference Output with Uncommitted Comparator
I
V
CC
: 2.97V to 16.5V Normal Operation, Protected
Against Surges to 33V.
I
16-Pin SSOP Package
I
Hot Board Insertion
I
Electronic Circuit Breaker
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
12V
V
CC
SENSE
GATE
GND
BRK TMR
LTC1642
RST TMR
16
15
14
8
2
3
COMPOUT
ON
FAULT
OV
10
4
6
9
RESET
FB
CRWBR
COMP
+
REF
COMP
–
5
7
1
11
13
12
C3
0.33
μ
F
C2
0.33
μ
F
C5
0.1
μ
F
Q2
2N2222
Q3
MCR
12DC
D1
1N4148
R6
2.87k
1%
R5
110k
1%
R2
100
5%
R3
107k
1%
R4
13k
1%
R9
220
5%
Q1
FDR9410A
C6
0.01
μ
F
C1
0.047
μ
F
C
LOAD
12V
AT 2.5A
R8
330
5%
R1
0.010
5%
R7
11.3k
1%
POWER-GOOD = 11.4V
1642 TA01
LATCH OFF: FLOAT FAULT
AUTOMATIC RETRY: TIE FAULT TO ON
RESET TIME = 200ms
CURRENT LIMIT TIME = 20ms
CROWBAR TIME = 90
μ
s
UNDERVOLTAGE = 10.8V
OVERVOLTAGE = 13.2V
+
C7
0.1
μ
F
R9 REQUIRED ONLY WITH SENSITIVE GATE SCRs,
NOT NEEDED WITH MCR12
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