ADP3168 Analog Devices, ADP3168 Datasheet - Page 14

• Manufacturer Part Number: ADP3168
• Description: 4-Phase Synchronous Buck Controller
• Manufacturer: Analog Devices

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ADP3168
Another important factor in the inductor design is the DCR,
which is used for measuring the phase currents. A large DCR
causes excessive power losses, while too small a value leads to
4
ENABLE
POWER
GOOD
V
V
IN
IN
RTN
12V
1N4148WS
D1
1.6µH
L1
NOTE:
1
FOR A DESCRIPTION OF OPTIONAL R
NICHICON PW SERIES
+
C1
C
39nF
470µF/16V × 6
1.33kΩ
DLY
R
1.5nF
B
C
1N4148WS
B
1N4148WS
1N4148WS
D2
10Ω
390pF
390kΩ
R4
R
D3
D4
4.7µF
C
4.7µF
4.7µF
C11
C15
DLY
C7
+
A
C6
Figure 11. 65 A Intel Pentium 4-CPU Supply Circuit, VRD 10 Design
FROM CPU
16.9kΩ
C19
1µF
R
A
249kΩ
1
2
3
4
1
2
3
4
1
2
3
4
R
T
BST
IN
OD
VCC
BST
IN
OD
VCC
BST
IN
OD
VCC
+
ADP3418
ADP3418
ADP3418
33pF
33µF
C
SW
C20
FB
U2
U3
U4
RESISTORS, SEE THE THEORY OF OPERATION SECTION.
PGND
PGND
PGND
DRVH
DRVH
DRVH
DRVL
DRVL
DRVL
383kΩ
SW
SW
SW
R
10
11
12
13
14
1
2
3
4
5
6
7
8
9
R
100nF
100nF
C12
C8
VID4
VID3
VID2
VID1
VID0
VID5
FBRTN
FB
COMP
PWRGD
EN
DELAY
RT
RAMPADJ
8
7
6
5
8
7
6
5
8
7
6
5
Rev. B | Page 14 of 24
ADP3168

100nF
C16
U1
IPD06N03L
CSCOMP
CSSUM
IPD06N03L
IPD06N03L
CSREF
PWM1
PWM2
PWM3
PWM4
ILIMIT
Q8
SW1
SW2
SW3
SW4
GND
VCC
Q2
Q5
28
27
26
25
24
23
22
21
20
19
18
17
16
15
IPD12N03L
IPD12N03L
IPD06N03L
IPD12N03L
IPD06N03L
IPD06N03L
increased measurement error. A good rule is to have the DCR
be about 1 to 1½ times the droop resistance (R
uses an inductor with a DCR of 1.6 mΩ.
2.2nF
C
R
CS1
Q1
Q4
Q3
Q7
Q6
Q9
SW2
4.7µF
4.7µF
4.7µF
C13
C17
1.5nF
C9
C
CS2
1
200kΩ
R
R
35.7kΩ
R
LIM
R
SW1
SW3 1
CS1
4.7nF
2.2Ω
4.7nF
2.2Ω
2.2Ω
4.7nF
1
600nH/1.6mΩ
C10
C14
R1
R2
C18
R3
600nH/1.6mΩ
600nH/1.6mΩ
73.2kΩ
R
L2
CS2
L3
L4
100kΩ, 5%
124kΩ
R
R
PH3
TH
FUJITSU RE SERIES
124kΩ
10µF × 23MLCC
R
8mΩ ESR (EACH)
PH2
+
820µF/2.5V × 8
C21
AROUND
SOCKET
124kΩ
R
PH1
+
C28
V
0.8375V–1.6V
65A AVG, 74A PK
V
CC(CORE)
CC(CORE) RTN
O
). Our example