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LTC4253/LTC4253A
34
425353aff
For more information www.linear.com/4253
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
?LINEAR TECHNOLOGY CORPORA TION 2002
LT 0113 REV F " PRINTED IN USA
(408) 432-1900
?/DIV>
 FAX: (408) 434-0507
 ?
 www.linear.com/4253
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER
DESCRIPTION
COMMENTS
LT1640AH/LT1640AL
Negative High Voltage Hot Swap Controllers in SO-8
Negative High Voltage Supplies from 10V to 80V
LT1641-1/LT1641-2
Positive High Voltage Hot Swap Controllers in SO-8
Supplies from 9V to 80V , Autoretry/Latched Off
LTC1642A
Fault Protected Hot Swap Controller
3V to 16.5V , Overvoltage Protection up to 33V
LT4250
48V Hot Swap Controller
Active Current Limiting, Supplies from 20V to 80V
LTC4251/LTC4251-1/
LTC4251-2
48V Hot Swap Controllers in SOT-23
Fast Active Current Limiting, Supplies from 15V
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
48V Hot Swap Controllers in MS8/MS10
Fast Active Current Limiting, Supplies from 15V , Drain
Accelerated Response, 1% Accurate UV/OV Thresholds
Figure 17. 48V/2.5A Application with Foldback Current Limiting and Transistor Enabled Sequencing without Feedback
R6
100k
R5
100k
R7
100k
PWRGD1
V
IN
EN2  EN3
V
IN
V
EE
LTC4253A
POWER
MODULE 1
PWRGD2
PWRGD3
OV
UV
RESET
DRAIN
SS
GATE
SQTIMER
SENSE
TIMER
EN
POWER
MODULE 2
EN
POWER
MODULE 3
EN
R
IN
10k
20k(1/4W)/2
4253 F17
R
C
10
R3
38.3k
R
D
3.3M
R
S
0.02
Q1
IRF530S
V
OUT
C
C
10nF
R4
22
C
T
1礔
C1
10nF
R8
47k
C
SQ
0.1礔
C
SS
33nF
+
C3
0.1礔
C2
100礔
C
IN
1礔
R2
392k
1%
R1
30.1k
1%
 
 
 
RESET
(LONG PIN)
48V RTN
(SHORT PIN)
48V RTN
(LONG PIN)
48V
(LONG PIN)
*DIODES, INC.
 
FMMT493
 
RECOMMENDED FOR HARSH ENVIRONMENTS.
D
IN
 
DDZ13B*
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