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ADP3168 Datasheet(PDF) 14 Page - Analog Devices

Part # ADP3168
Description  6-Bit, Programmable 2-, 3-, 4-Phase Synchronous Buck Controller
PDF  24 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP3168 Datasheet(HTML) 14 Page - Analog Devices

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ADP3168
Rev. B | Page 14 of 24
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
increased measurement error. A good rule is to have the DCR
be about 1 to 1½ times the droop resistance (RO). Our example
uses an inductor with a DCR of 1.6 mΩ.
ENABLE
POWER
GOOD
RLIM
200k
Ω
CDLY
39nF
RT
249k
Ω
RDLY
390k
Ω
RA
16.9k
Ω
CFB
33pF
CA
390pF
CCS1
2.2nF
RB
1.33k
Ω
CB
1.5nF
RPH1
124k
Ω
FROM CPU
RR
383k
Ω
CCS2
1.5nF
RCS1
35.7k
Ω
RPH3
124k
Ω
RSW11
RSW31
RSW21
RCS2
73.2k
Ω
RPH2
124k
Ω
U1
ADP3168
VID4
VID3
VID2
VID1
VID0
VID5
FBRTN
FB

COMP
PWRGD
EN
DELAY
RT
RAMPADJ
VCC
PWM1
PWM2
PWM3
PWM4
SW1
SW2
SW3
SW4
GND
CSCOMP
CSSUM
CSREF
ILIMIT
C19
1
µF
R4
10
Ω
C20
33
µF
Q8
IPD06N03L
L4
600nH/1.6m
Ω
BST
IN
OD
VCC
DRVH
SW
PGND
DRVL
C15
4.7
µF
C18
4.7nF
R3
2.2
Ω
RTH
100k
Ω, 5%
Q9
IPD06N03L
U4
ADP3418
D4
1N4148WS
C17
4.7
µF
Q7
IPD12N03L
C16
100nF
Q5
IPD06N03L
C12
100nF
U3
ADP3418
BST
IN
OD
VCC
DRVH
SW
PGND
DRVL
C11
4.7
µF
D3
1N4148WS
C14
4.7nF
R2
2.2
Ω
Q6
IPD06N03L
Q2
IPD06N03L
Q3
IPD06N03L
Q4
IPD12N03L
L3
600nH/1.6m
Ω
C7
4.7
µF
C13
4.7
µF
10
µF × 23MLCC
AROUND
SOCKET
VCC(CORE)
0.8375V–1.6V
65A AVG, 74A PK
VCC(CORE) RTN
820
µF/2.5V × 8
FUJITSU RE SERIES
8m
Ω ESR (EACH)
L2
600nH/1.6m
Ω
C21
C28
C10
4.7nF
R1
2.2
Ω
Q1
IPD12N03L
C8
100nF
C9
4.7
µF
U2
ADP3418
BST
IN
OD
VCC
DRVH
SW
PGND
DRVL
++
+
D2
1N4148WS
D1
1N4148WS
VIN 12V
VIN RTN
L1
1.6
µH
C1
C6
470
µF/16V × 6
NICHICON PW SERIES
++
NOTE:
1 FOR A DESCRIPTION OF OPTIONAL RSW RESISTORS, SEE THE THEORY OF OPERATION SECTION.
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4
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4
1
2
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4
8
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Figure 11. 65 A Intel Pentium 4-CPU Supply Circuit, VRD 10 Design



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