HIP6020A

FN4735 Rev 2.00

Page 15 of 16

September 2001

HIP6020A DC-DC Converter Application Circuit

Figure 11 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 a very similar circuit employing an

HIP6020, including a Bill-of-Materials and circuit board

description, see Application Note AN9836. Also see Intersil

web page (www.intersil.com).

VID1

VID2

VID3

VID4

SS

GND

VCC

+5VIN

VID0

+12VIN

PGND

VSEN1

PGOOD

LGATE1

UGATE1

OCSET1

PHASE1

Q1,2

POWERGOOD

FB1

COMP1

VOUT2

VSEN2

UGATE2

Q3

DRIVE3

FB3

DRIVE4

C28,29

VOUT3

VOUT4

C26,27

C15-22

HIP6020A

Q4

L3

+

+

+

+

+

C8

L1

C1-7

C10

C9

R1

VOUT1

R3

R4

C23

C24

C25

C30

2x1000

F

2x1000

F

C12-14

3x1000

F

1

H

7x1000

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/1.5V)

(1.5V)

(1.8V)

FB4

TYPEDET

SELECT

+3.3VIN

R6

499K

R5

150K

SD

PHASE2

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

OCSET2

CR1

C11

1000pF

R2

L2

6.2

H

MBRD835L

2.7K

HUF76107D3S

HUF76107D3S

HUF76107D3S

HUF76143S3S

(1.3V-3.5V)

FIGURE 11. POWER SUPPLY APPLICATION CIRCUIT FOR A MICROPROCESSOR COMPUTER SYSTEM

+3.3VIN