LT4250L/LT4250H
14
4250lhfa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2001
LT 0309 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
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®
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LT1640AH/LT1640AL –48V Hot Swap Controller in SO-8 LT4250 is a Pin-Compatible Upgrade to LT1640
LT1641-1/LT1641-2 48V Hot Swap Controller in SO-8 Foldback Current Limit, 9V to 80V, Auto-Retry/Latch-Off
LTC1642 Fault Protected Hot Swap Controller Operates Up to 16.5V, Protected to 33V
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LTC1647 Dual Hot Swap Controller Dual ON Pins for Supplies from 3V to 15V
LTC4211 Hot Swap Controller With Multifunction Current
Control
2.5V to 16.5V Supplies, Active Inrush Current Limiting
LTC4251 –48 Hot Swap Controller in SOT-23 Active Current Limiting, Fast Comparator for Catastrophic Faults
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UV/0V Pins, Power-Good Output
Figure 15. Typical Application Using a Filter Module
+
V
EE
V
DD
LT4250L
PWRGD
SENSE
C1
470nF
25V
C2
15nF
100V
C3
0.1μF
100V
C4
0.1μF
100V
C6
0.1μF
100V
C5
100μF
100V
C7
100μF
16V
Q1
IRF530
R2
10Ω
5%
R3
1k
5%
R4
549k
1%
R5
6.49k
1%
R6
10k
1%
R1
0.02Ω
5%
4
OV
–48V RTN
3
2
–48V
UV
5
6
8
7
1
GATE
DRAIN
LUCENT
JW050A1-E
V
OUT
+
SENSE
+
TRIM
SENSE
–
V
OUT
–
V
IN
+
9
5V
4250 F15
8
7
6
5
3
1
2
4
ON/OFF
CASE
V
IN
–
V
OUT
+
V
OUT
–
V
IN
+
CASE
V
IN
–
+
LUCENT
FLTR100V10
–48V RTN
(SHORT PIN)
*
* DIODES INC. SMAT70A
43
21
MOC207
R7
51k
5%
1N4003
Using an EMI Filter Module
Many applications place an EMI filter module in the
powerpath to prevent switching noise of the module
from being injected back onto the power supply. A typical
application using the Lucent FLTR100V10 filter module is
shown in Figure 15. When using a filter, an optoisolator
is required to prevent common mode transients from
destroying the PWRGD and ON/OFF pins.
