LTC1647-2CS8#TR Linear Technology, LTC1647-2CS8#TR Datasheet - Page 22

• Manufacturer Part Number: LTC1647-2CS8#TR
• Description: IC CONTROLLER HOTSWAP DUAL 8SOIC
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC1647-2CS8#TR

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 2.7 V ~ 16.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1647-1/
LTC1647-2/LTC1647-3
TYPICAL APPLICATION
Hot Swapping Two Supplies
Two separate supplies can be independently controlled by
using the LTC1647-3. In some applications, sequencing
between the two power supplies is a requirement. For
example, it may be necessary to ramp-up one supply first
before allowing the second supply to power-up, as well
as requiring that this same supply ramp-down last on
power-down. Figure 14’s circuit illustrates how to program
the delays between the two pass transistors using the
RELATED PARTS
PART NUMBER
LTC1421
LTC1422
LT1640AL/LT1640AH
LT1641
LT1642
LTC1643L/LTC1643H
LT1645
22
12V SUPPLY
5V SUPPLY
FAULT
GND
ON1
ON2
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
*REQUIRED FOR V
R5
10k
●
R6
10k
FAX: [phone]
DESCRIPTION
2-Channel Hot Swap Controller
Hot Swap Controller in SO-8
Negative Voltage Hot Swap Controller in SO-8
High Voltage Hot Swap Controller in SO-8
Fault Protected Hot Swap Controller
PCI-Bus Hot Swap Controller
2-Channel Hot Swap Controller
12k
R7
R4
4.7k
CC
> 10V
2
3
4
5
8
ON1
FAULT1
ON2
FAULT2
GND
V
V
CC1
CC2
1
16
0.01Ω
0.02Ω
R10
R1
●
LTC1647-3
www.linear.com
SENSE1
SENSE2
Figure 14. Hot Swapping Two Supplies
15
14
R3
100Ω
R8
100Ω
IRF7413
IRF7413
GATE1
GATE2
Q2
Q1
13
12
R2
10Ω
R9
10Ω
+
+
C
C1
10nF
C3
10nF
C
LOAD
LOAD
V
(5A)
V
(2.5A)
OUT1
OUT2
ON1 and ON2 pins (time events t1 to t4). t5 and t7 show
both channels being switched on simultaneously where
sequencing is not crucial.
Some applications require that both channels be gated
off if a fault occurs in one channel. This is accomplished
in Figure 14 by using a crisscross FAULT-to-SENSE
arrangement of R3/R4 and R7/R8. t6 and t9 illustrate the
circuit’s operation.
*D1
DDZ23
V
V
V
V
V
OUT1
OUT2
V
ON1
ON2
R10
R1
t1
COMMENTS
24-Pin, Operates from 3V to 12V and Supports –12V
System Reset Output with Programmable Delay
Operates from –10V to –80V
Operates from 9V to 80V
Operates Up to 16.5V, Protected to 33V
3.3V, 5V and ±12V in Narrow 16-Pin SSOP
Operates from 1.2V to 12V, Power Sequencing
t2
t3
t4
” LINEAR TECHNOLOGY CORPORA TION 1999
t5
LT 1010 REV A • PRINTED IN USA
t6
t7
t8
1647-1/2/3 F14
1647fa
t9