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ADP3157 View Datasheet(PDF) - Analog Devices
Part Name
Description
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ADP3157
5-Bit Programmable Synchronous Controller for Pentium® III Processors
Analog Devices
ADP3157 Datasheet PDF : 12 Pages
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ADP3157
100k
⍀
P
SYSTEM
22
⍀
ADP3157
1
VID1
VID0
16
2
VID2
PGND
15
3
VID3
DRIVE1
14
4
VID4
DRIVE2
13
5
AGND
6
SD
V
CC
12
PWRGD
11
7
SENSE–
CMP
10
8
SENSE+
C
T
9
22
F
1
F
IRL3803
R1
105k
⍀
IRL3803
R2
18.2k
⍀
C
COMP
3600pF
C
T
200pF
220
⍀
1nF
220
⍀
ESR = 25m
⍀
EACH
2200
F
؋
3
(25V)
L2
1
H
1
F
L1
1.7
H
R
SENSE
5m
⍀
ESR = 25m
⍀
EACH
2200
F
؋
6
(25V)
10BQ015
Figure 2. Typical VRM8.2/8.3/8.4 Compliant Core DC/DC Converter Circuit
V
CC
+12V
V
IN
+5V
+5V RTN
+12V RTN
V
O
1.3V TO
3.5V
0-19A
RTN
V
CC
DRIVE1 DRIVE2 PGND AGND PWRGD
SENSE+
SENSE–
12
14
13
5
11
SD
6
C
T
NONOVERLAP
DRIVE
CROWBAR
IN
S
Q
R
V
T2
CMPT
V
REF
+15%
DELAY
V
REF
+5% V
REF
–5%
CMPI
V
T1
g
m
OFF-TIME
CONTROL
SENSE–
ADP3157
2R
REFERENCE
1.20V
V
REF
R
DAC
VID0
1
VID1
2
VID2
3
VID3
4
VID4
10
CMP
Figure 3. Functional Block Diagram
–4–
REV. A
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