US3022

4-7

Rev. 1.0

11/2/99

TYPICAL APPLICATION

TYPICAL APPLICATION

5VSB

6MV1500DX

23

28

16

1

9

11

18

19

15

14

17

12

3

5

6

7

8

20

21

22

24

25

26

27

4

13

US3022

Vref(2V)

VID3

VID2

VID1

VID0

6MV1500DX

2

10

Fault/Rt

The Vref(2V) can be used to provide reference for

the ACPI regulatos. In this application the ACPI

regulators are designed using op-amp and discrete

transistors.

C4

220PF

Q1

IRL3103S

+

C2

1500uf

+

C3

1500uf

+

C7

1500uf

R2

5.1

Q3

IRL3103S

R3

5.1

+

C8

1500uf

+

C9

1500uf

+

C10

1500uf

+

C11

1500uf

+

C12

1500uf

R1

2.21K

L2

2.5UH

C5

1UF

L1

1UH

+

C1

680uf

Q2

IRL3103S

+

C13

680uf

+

C6

220UF

C14

1UF

C18

0.1uF

+

C16

680uf

+

C15

680uf

Q6

PMBT2222A

+

C17

220uf

C19

0.1uF

Q5

MJD200

Q4

MJD200

VCORE

12V

+5Vin

Vout2(1.5V or 3.3V)

3.3Vin

Vout3 (1.5V)

TYPE DETECT#

Vout4(1.8V)

PGood

Vout5(2.5V)

Figure 2 - Typical application of US3022 for an on board DC-DC converter providing power for the Vcore , GTL+,

1.8V chip set supply, 2.5V clock supply as well as auto select AGP supply for the next generation PC applica-

tions.