ADP3157 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP3157

5-Bit Programmable Synchronous Controller for Pentium® III Processors

Analog Devices 

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

VCC 12

PWRGD 11

7 SENSE–

CMP 10

8 SENSE+

CT 9

22␮F

1␮F

IRL3803

R1

105k⍀

IRL3803

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

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

VCC +12V

VIN +5V

+5V RTN

+12V RTN

VO

1.3V TO

3.5V

0-19A

RTN

VCC DRIVE1 DRIVE2 PGND AGND PWRGD SENSE+ SENSE–

12

14

13

5

11

SD 6

CT

NONOVERLAP

DRIVE

CROWBAR

IN

S

Q

R

VT2

CMPT

VREF +15%

DELAY

VREF +5% VREF –5%

CMPI

VT1

gm

OFF-TIME

CONTROL

SENSE–

ADP3157

2R

REFERENCE

1.20V

VREF

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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