Datasheet

LTC1644
19
1644f
APPLICATIO S I FOR ATIO
WUU
U
Figure 12. No 5V Supply Application Circuit
C1
0.047µF
GND
3V
IN
3V
IN
R21 1.74Ω
3V
SENSE
17
3V
OUT
18
5V
IN
LTC1644*
13
C6
0.01µF
5V
OUT
3
5V
SENSE
14 16
GATE
15
8
R3
10Ω
3V
OUT
1644 F12
R5
1k
R1
0.005Ω
Q1
IRF7413
Z3: 1PMT5.0AT3
*ADDITIONAL PINS OMITTED FOR CLARITY
PCB EDGE
BACKPLANE
CONNECTOR
BACKPLANE
CONNECTOR
3.3V
LONG 3.3V
GROUND
Z3
C8 0.1µF
PER 10
POWER PINS
C1
0.047µF
C4
0.01µF
GND
12V
IN
V
EEIN
OFF/ON
FAULT
PWRGD
RESETIN
3V
IN
3V
IN
*
R22 2.74Ω
5V
IN
*
3V
SENSE
17
3V
OUT
18
5V
IN
LTC1644
13
PRECHARGE DRIVE
5V
OUT
3
5V
SENSE
1416
GATE
15
1
2
5
6
7
9
12V
OUT
V
EEOUT
TIMER
RESETOUT
20
19
4
EARLY V(I/O)
R18
2k
R19
1k
R20 1.2k
R3
10Ω
5V
IN
R21 1.74Ω
R4
10Ω
R17
2k
5V
OUT
3V
OUT
12V
OUT
V
EEOUT
NC
R5
1k
R1
0.005Ω
Q1
IRF7413
Q2
IRF7413
R2
0.007Ω
C2
0.1µF
R15
1Ω
12 11
10
Z1
Z1: SMAJ12CA Z3, Z4: 1PMT5.0AT3
*5V
IN
AND 3V
IN
MAY BE USED AS SOURCES OF EARLY POWER
I/O DATA LINE 1
I/O DATA LINE 128
I/O #1
1644 F11
Q3
MMBT2222A
8
R11
51k
R10
18Ω 5%
3V
IN
3V
OUT
R13
10Ω
I/O #128
R14
10Ω
R12
51k
1V
±10%
R6
2k
R8 1k
R7
12Ω
C3 4.7nF
R9
24Ω
RESET#
PCI
BRIDGE
(21154)
PCB EDGE
BACKPLANE
CONNECTOR
C8 0.1µF
PER 10
POWER
PINS
Z3
C7
0.01µF
C6
0.01µF
BACKPLANE
CONNECTOR
5V
LONG 5V
3.3V
LONG 3.3V
12V
BD_SEL#
HEALTHY#
PCI_RST#
GROUND
I/O PIN 1
I/O PIN 128
• • •
I/O #1
I/O #128
• • • • • •
C
LOAD(5VOUT)
C
LOAD(3VOUT)
C
LOAD(12VOUT)
Z4
C9 0.1µF
PER 10
POWER
PINS
+
+
+
Figure 11. No V
EE
(–12V) Supply Application Circuit