HIP6021

FN4684 Rev 1.00

Page 15 of 15

March 8, 2005

HIP6021 DC-DC Converter Application Circuit

Figure 12 shows an application circuit of a power supply for a

microprocessor computer system. The power supply provides the

microprocessor core voltage (VOUT1), the AGP bus voltage

(VOUT2), the GTL bus voltage (VOUT3), and the memory voltage

(VOUT4) from +3.3V, +5VDC, and +12VDC. For detailed

information on the circuit, including a Bill-of-Materials and circuit

board description, see Application Note AN9836. Also see

Intersil’s web page (http://www.intersil.com).

VID1

VID2

VID3

VID4

SS

GND

VCC

VID0

PGND

VSEN1

PGOOD

LGATE

UGATE

OCSET

PHASE

Q1,2

POWERGOOD

FB

COMP

VSEN2

DRIVE2

Q3

DRIVE3

VSEN3

DRIVE4

C25,26

C23,24

C12-19

HIP6021

Q4

L2

+

+

+

+

+

C7

L1

C1-6

C9

C8

R1

R2

R3

C20

C21

C22

C27

2x1000

F

2x1000

F

C10,11

2x1000

F

1

H

6x1000

F

1

F

1

F

1000pF

8x1000

F

0.1

F

4.2

H

0.22

F

10pF

2.7nF

10.2K

1.62k

GND

(3.3V or 1.5V)

(1.5V)

(1.8V)

VSEN4

TYPEDET

SELECT

R5

499K

R4

150K

SD

FIX

1.0K

Q5

U1

1

2

3

4

5

6

7

8

9

10

11

12

13

16

15

14

17

18

19

20

21

22

23

24

25

26

27

28

FAULT/RT

VAUX

HUF76107D3S

HUF76107D3S

HUF76121D3S

2xHUF76143S3S

(1.3V-3.5V)

FIGURE 12. POWER SUPPLY APPLICATION CIRCUIT FOR A MICROPROCESSOR COMPUTER SYSTEM