ADP3155 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP3155

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

Analog Devices 

ADP3155

␮P

SYSTEM

1␮F

VLDO1

+1.5V

4A

RTN

IRF3103

470pF

1000␮F

R4

5k⍀

R3

20k⍀

ADP3155

1 VID1

VID0 20

2 VID2 PGND 19

3 VID3 DRIVE1 18

4 VID4 DRIVE2 17

5 AGND

VCC 16

6 SD PWRGD 15

2k⍀

7 FB1

FB2 14

8 VLDO1 VLDO2 13

9 SENSE– CMP 12

10 SENSE+

CT 11

100k⍀

22⍀

22␮F

1␮F

ESR = 25m⍀ EACH

2200␮F ؋3

L2

1␮H

1␮F

VIN +1.8V

VIN +12V

VIN +5V

+5V RTN

+12V RTN

R1

150k⍀

2k⍀

R2

39k⍀

CT

200pF

Q1

IRL3803

Q2

IRL3803

L1

1.7␮H

RSENSE ESR = 25m⍀ EACH

5m⍀

2200␮F ؋ 6

10BQ015

VO

2V

0–19A

RTN

CCOMP

2nF

470pF

220⍀

Q4

IRLR3703

R6

21.7k⍀

R5

20k⍀

1␮F

VINLDO2

+3.3V

1000␮F

VLDO2

+2.5V

0–2A

RTN

1nF

220⍀

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

SD 6

VCC DRIVE1 DRIVE2 PGND AGND PWRGD

16

18

17

5

15

SENSE+ SENSE–

10

9

REFERENCE

NONOVERLAP

DRIVE

CROWBAR

IN

OFF

S

Q

R

VT2

VREF + 15%

DELAY

2R

VREF + 5% VREF – 5%

CMPI

1.20V

VT1

gm VREF

R

CMPT OFF-TIME

CONTROL

VIN

SENSE–

ADP3155

DAC

11

12

CT

CMP

Figure 3. Functional Block Diagram

13 VLDO2

14 FB2

8 VLDO1

FB1

VID0

1 VID1

2 VID2

3 VID3

4 VID4

–4–

REV. A

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