LTC1421CSW#TR Linear Technology, LTC1421CSW#TR Datasheet - Page 17

• Manufacturer Part Number: LTC1421CSW#TR
• Description: IC CONTROLLER HOTSWAP ADJ 24SOIC
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC1421CSW#TR

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 3 V ~ 12 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Linear Misc Type: Positive Low Voltage
• Family Name: LTC1421
• Package Type: SOIC W
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 12V
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
5V Only Applications
The LTC1421 may be used in 5V only applications as shown
in Figure 18. A soft reset can be generated from the
backplane via an open-collector inverter driving the FB (Pin
11) or by a push button to ground. A hard power reset is
generated from the backplane via an open-collector inverter
driving the POR (Pin 3). A hard reset cycles the power on
the board or resets the electronic circuit breaker. The
comparator is used to monitor the board supply voltage and
– 48V
– 48V
– 48V
BACKPLANE
POWERGOOD
HARD RESET
SOFT RESET
FAULT
U
PC BOARD
5V
5V
INFORMATION
1/6
LS7004
10k
10k
U
5V
5.1V
BACKPLANE
D1
– 48V
S1
R1
5.1k
1W
+
W
C1
1 F
C2
2.2 F
25V
PC BOARD
24
Figure 18. 5V Only Application with Soft Reset
2
4
3
1
Figure 19. – 48V to 5V Hot Swappable Supply
23
22
12
U
21
LTC1421
C1
1 F
15
5
20
1
19
3
12
23
1
18
0.005
1W
R1
2.2 F
17
25V
C3
16
2
will pull the POWERGOOD signal low as long as the supply
remains above 4.65V. Note that a soft reset will not affect
the POWERGOOD signal. The FAULT signal is also moni-
tored to determine that the circuit breaker has tripped.
– 48V and 24V Applications
The LTC1421 may be used in – 48V applications as shown
in Figure 19. The LTC1421 provides the hot insertion
protection, while the 5V supply is generated by a power
+
10
9
13
14
8
11
15
6
7
5
4
22
MTB50N06E
LTC1421
300
1/8W
Q1
R4
21
9
R2
15k
1/8W
IRFR9110
1 F
20
6
Q1
19
3
Q2
MPSA06
R3
56k
1/2W
18
17
LTC1421/LTC1421-2.5
R5
10k
1/2W
R6
402
1/8W
16
10k
R4
10
7
14
13
8
11
+
C4
100 F
100V
C2
1 F
1 F
S1
1
2
1421 F19
+IN
–IN
1421 F18
ASD 10-48S5
R2
28k
1%
R3
10.2k
1%
ASTRODYNE
CONTROL
C
– OUT
6
LOAD
+OUT
LOGIC
RESET
3
5
+
5V
C4
100 F
16V
5V
2A
17