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LTC1421 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC1421
Description  Hot Swap Controller
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1421 Datasheet(HTML) 10 Page - Linear Technology

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10
LTC1421/LTC1421-2.5
APPLICATIONS INFORMATION
A 5k resistor is tied from the FB pin to VOUTLO, setting the
internal threshold to about 2.9V. The new reset threshold
voltage is set by the external resistive divider connected to
COMP2. When VOUTLO drops below the new threshold,
COMPOUT pulls FB to ground, changing the internal
threshold at COMP1 to 5.88V and generating a reset.
Finally, the comparator may be used to monitor a negative
supply as shown in Figure 8e. The external resistor divider
Figure 8c shows how the comparator can be used to
generate a reset when the 12V supply (VOUTHI) drops
below 10.8V. The 5V supply (VOUTLO) also generates a
reset when it dips below 4.65V. When the 12V supply
drops below 10.8V, COMPOUT will pull the FB pin low
setting the internal threshold voltage for comparator 1 to
5.88V. Since VOUTLO is less than 5.88V, PWRGD immedi-
ately goes low and a reset is generated 200ms later.
Figure 8d shows how the comparator can be used to
override the internal reset voltage for a 5V supply on
VOUTLO.
–
+
–
+
VCCLO
VCCLO
1421 F08c
1.232V
LTC1421
20
µA
20
µA
8
14
13
15
11
16
20
26.7k
COMP1
COMP2
RESET
TIMING
73.5k
107k
1%
13.7k
1%
6
7
71.5k
5V
12V
Figure 8c. Reset 12V at 10.8V, Reset 5V at 4.65V
Figure 8e. Monitor – 12V at – 10.8V, Reset 5V at 4.65V
–
+
–
+
VCCLO
VCCLO
1421 F08e
1.232V
LTC1421
20
µA
20
µA
8
14
13
15
11
16
20
26.7k
COMP1
COMP2
RESET
TIMING
73.5k
107k
1%
10k
5%
13.7k
1%
6
7
71.5k
5V
12V
– 12V
Figure 8d. Reset 5V at 4.5V
–
+
–
+
VCCLO
VCCLO
1421 F08d
1.232V
LTC1421
20
µA
20
µA
8
14
13
15
11
16
20
26.7k
COMP1
COMP2
RESET
TIMING
73.5k
102k
1%
5k
5%
38.3k
1%
6
7
71.5k
5V
12V
–
+
–
+
VCCLO
VCCLO
1421 F08b
1.232V
LTC1421
20
µA
20
µA
8
14
13
15
11
16
20
26.7k
COMP1
COMP2
RESET
TIMING
73.5k
10k
5%
107k
1%
38.3k
1%
6
7
71.5k
3.3V
5V
Figure 8b. Monitor 5V, Reset 3.3V at 2.9V



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