PRODUCT DATABOOK 1996/1997
LX1664/64A, LX1665/65A
D
UAL
O
UTPUT
PWM C
ONTROLLERS
P
R O D U C T I O N
WITH
5-B
IT
DAC
D
A T A
S
H E E T
A P P L I C AT I O N I N F O R M AT I O N
C
S
5V
R
S
12V
C
3
0.1µF
1
2
3
F
1
15A
L
2
1µH
Q
1
U1
LX1665
SS
INV
V
CC_CORE
VID0
VID1
VID2
VID3
VID4
L
FB
V
C1
TDRV
GND
BDRV
V
CC
C
T
OV
L
DRV
PWRGD
18
17
16
15
14
13
12
11
10
C
5
1µF
C
2
6.3V
1500µF x3
IRL3102
L
1
2.5µH
5V or 3.3V
Supply
Supply Voltage
for CPU Core
VID0
VID1
VID2
VID3
VID4
4
5
6
7
8
9
Q
2
V
OUT
IRL3303
C
8
680pF
Q
4
IRLZ44
R
5
R
6
6.3V, 1500µF x 3
C
1
C
9
330µF
** Three capacitors for Pentium
Four capacitors for Pentium II
18-pin
Wide Body SOIC
OV
PWRGD
1.5V for
GTL+ Bus Supply
C
7
330µF
FIGURE 8
— VRM 8.2 (Pentium II / Deschutes) Reference Design With Loss-Less Current Sensing
D
2
1N4148
C
3
0.1µF
1
2
3
D
3
1N4148
C
10
0.1µF
R
7
10
F
1
20A
12V
5V
U1
LX1665
SS
INV
V
CC_CORE
VID0
VID1
VID2
VID3
VID4
L
FB
V
C1
TDRV
GND
BDRV
V
CC
C
T
OV
L
DRV
PWRGD
18
17
16
15
14
13
12
11
10
1µF
C
5
6.3V
1500µF x3
C
2
Q
1
IRL3303
L
1
2.5µH
C
9
R
1
0.0025
Supply Voltage
for CPU Core
VID1
VID2
VID3
VID4
5
6
7
8
9
330µF
C
8
1500µF
1N5817
D
4
Q
3
SCR
2N6504
Q
4
IRLZ44
C
1
18-pin
Wide-Body SOIC
R
2
, 10k
PWRGD
R
5
R
6
C
7
330µF
Supply Voltage
For I/O Chipset or GTL+ Bus
FIGURE 9
— Full-Featured Pentium II Processor Supply With 12V Power Input
6.3V, 1500µF x 3**
IRL3102
** Three capacitors for Pentium
Four capacitors for Pentium II
VID0
4
Q
2
V
OUT
10
Copyright © 1999
Rev. 1.2 11/99
MICROSEMI [ MICROSEMI CORPORATION ]
