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ADP3154JRU

5-Bit Programmable Dual Power Supply Controller for Pentium® III Processors

Analog Devices 

ADP3154

100k⍀

␮P

SYSTEM

ADP3154

1 VID1

VID0 20

2 VID2

PGND 19

3 VID3

NC 18

4 VID4

DRIVE1 17

5 AGND

6 SD

7 FB

DRIVE2 16

VCC 15

PWRGD 14

IRLR2703

2k⍀

470pF

8 NC

9 VLDO

10 SENSE–

CMP 13

CT 12

SENSE+ 11

VO2

+3.3V

0.5A

1000␮F

RTN

1.1⍀

2N2222

RPROG

35k⍀

R3

20k⍀

NC = NO CONNECT

22⍀

22␮F

1␮F

IRL3803

IRL3803

R1

105k⍀

R2

18.2k⍀

CCOMP

3600pF

CT

200pF

220⍀

1nF

220⍀

ESR = 25m⍀ EACH

2200␮F ؋3

(25V)

L2

1␮H

1␮F

L1

1.7␮H

RSENSE

5m⍀

ESR = 25m⍀ EACH

2200␮F ؋ 6

(25V)

10BQ015

VIN +12V

VCC +5V

+5V RTN

+12V RTN

VO

2V

0-19A

RTN

Figure 2. Typical VRM8.2/8.3/8.4 Compliant Core DC/DC Converter Circuit

SD 6

VCC DRIVE1 DRIVE2 PGND AGND PWRGD SENSE+ SENSE–

15

5

14

11

10

ADP3154

NONOVERLAP

DRIVE

CROWBAR

IN

OFF

VREF +15%

DELAY

VREF +5% VREF –5%

CMPI

REFERENCE

2R

1.20V

S

Q

R

VT2

VT1

gm VREF

R

CMPT OFF-TIME

CONTROL

VIN

SENSE–

12

13

CT

CMP

DAC

Figure 3. Functional Block Diagram

9 VLDO

FB

VID0

1 VID1

2 VID2

3 VID3

4 VID4

–4–

REV. A

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