LTC4211
40
4211fc
For more information www.linear.com/LTC4211
LINEAR TECHNOLOGY CORPORATION 2006
LT 1016 REV C • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC4211
RELATED PARTS
TYPICAL APPLICATION
LOW COST OVERVOLTAGE PROTECTION
There is an alternative method to implementing the over-
voltage protection using a resistive divider at the FILTER
pin (see Figures 27 and 28). In this implementation, the
SLOW COMP is NULL in Normal Mode. Only the F
AST
COMP cir
cuit breaker is available and the current limit
level is 150mV/R
SENSE
. During the soft-cycle, the inrush
current servo loop is at 50mV/R
SENSE
. So, the heavy load
should only turn on at/after the end of second cycle where
the RESET pin goes high.
Figure 27. LTC4211MS High Side Overvoltage Protection Implementation
(In Normal Mode, SLOW COMP Is Disabled. In Soft-Start Cycle, I
SOFTSTART
Is Still 50mV/R
SENSE
)
Figure 28. LTC4211MS Low Side Overvoltage Protection Implementation
(In Normal Mode, SLOW COMP Is Disabled. In Soft-Start Cycle, I
SOFTSTART
Is Still 50mV/R
SENSE
)
1
2
3
4
5
10
9
8
7
6
FAULT
V
CC
SENSE
GATE
FB
RESET
ON
FILTER
TIMER
GND
LTC4211
Q1
Si4410DY
R1
3.6k
V
OUT
5V
5A
R2
750Ω
C
LOAD
4211 F28
R
SENSE
0.007Ω
+
R8
750Ω
C
TIMER
10nF
LONG
5V
GND
FAULT
LONG
PCB EDGE
CONNECTOR
(MALE)
BACKPLANE
CONNECTOR
(FEMALE)
SHORT
SHORT
SHORT
RESET
ON/OFF
R7
10Ω
Z1*
C1
0.1µF
R4
10k
R6
10k
R5
10k
R3
10k
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
PART NUMBER DESCRIPTION COMMENTS
LTC1421 Two Channels, Hot Swap Controller 24-Pin, Operates from 3V to 12V and Supports –12V
LTC1422 Single Channel, Hot Swap Controller 8-Pin, Operates from 2.7V to 12V
LT1640AL/LT1640AH Negative Voltage Hot Swap Controller 8-Pin, Operates from –10V to –80V
LT1641-1/LT1641-2 Positive Voltage Hot Swap Controller 8-Pin, Operates from 9V to 80V, Latch-Off/Auto Retry
LTC1642 Single Channel, Hot Swap Controller 16-Pin, Overvoltage Protection to 33V
LTC1644 PCI Hot Swap Controller 16-Pin, 3.3V, 5V and ±12V, 1V Precharge, PCI Reset Logic
LTC1647 Dual Channel, Hot Swap Controller 8-Pin, 16-Pin, Operates from 2.7V to 16.5V
LTC4230 Triple Hot Swap Controller with Multifunction Current Control Operates from 1.7V to 16.5V
1
2
3
4
5
10
9
8
7
6
FAULT
V
CC
SENSE
GATE
FB
RESET
ON
FILTER
TIMER
GND
LTC4211
Q1
Si4410DY
R1
36k
V
OUT
5V
5A
R2
15k
C
LOAD
4211 F27
R
SENSE
0.007Ω
+
C
TIMER
10nF
LONG
5V
GND
FAULT
LONG
PCB EDGE
CONNECTOR
(MALE)
BACKPLANE
CONNECTOR
(FEMALE)
SHORT
SHORT
SHORT
RESET
ON/OFF
R3
10Ω
Z1*
C1
0.1µF
R5
10k
R6
10k
R8
4.3k
R7
10k
R9
750Ω
R4
10k
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
