Datasheet

10
LTC1643AL
LTC1643AL-1/LTC1643AH
1643afb
Figure 2. Normal Power-Up Sequence
Figure 3. Normal Power-Down Sequence
ON
10V/DIV
TIMER
10V/DIV
GATE
10V/DIV
12V
OUT
5V/DIV
5V
OUT
5V/DIV
3V
OUT
5V/DIV
V
EEOUT
5V/DIV
FAULT
10V/DIV
PWRGD
10V/DIV
10ms/DIV
1643A F02
ON
10V/DIV
TIMER
10V/DIV
GATE
10V/DIV
12V
OUT
5V/DIV
5V
OUT
5V/DIV
3V
OUT
5V/DIV
V
EEOUT
5V/DIV
FAULT
10V/DIV
PWRGD
10V/DIV
10ms/DIV
1643A F03
R2
0.005Ω
Q2
IRF7413
Q1
IRF7413
R1
0.007Ω
R5
10Ω
R6
10Ω
R7
100Ω
C1
0.047µF
5V
5A
3.3V
7.6A
GND
–12V
100mA
12V
500mA
R3
10k
R4
10k
11 3 13 12 14
16
15
4
109
8
1
2
5
6
7
3V
IN
GND
12V
IN
V
EEIN
ON
FAULT
PWRGD
3V
SENSE
5V
SENSE
3V
OUT
LTC1643AH
5V
OUT
12V
OUT
V
EEOUT
TIMER
5V
IN
GATE
1643A F01
SYSTEM
POWER
SUPPLY
PCI
POWER
SYSTEM
CONTROLLER
C2
0.1µF
RESET
LOGIC
RESET
43
21
43
21
Figure 1. Typical PCI Application
APPLICATIONS INFORMATION
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