IRU3034 & (PbF)

4

www.irf.com

TYPICAL APPLICATION

Pentium Core Supply Application (IRU3034 and IRU3033 Dual Layout)

Low Cost 4-Bit VID

Figure 3 - Typical application of IRU3034 in a flexible motherboard with the 4-bit VID output voltage selection. This

circuit is done using a dual layout with the IRU3033 part. The advantage of this circuit is that it uses a single jumper

that programs the output voltage in 16 steps with 0.1V steps from 2V to 3.5V, designed for Intel P55, P54, AMD K5

& K6 as well as Cyrix M1 and M2 applications.

0 = Jumper block is installed.

1 = Jumper block is not installed.

Note: R9 can be

eliminated if dual

layout with IRU3033

is not desired.

JP1

1-2

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

JP1

3-4

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

JP1

5-6

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

JP1

7-8

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

Output

Voltage

3.5

3.4

3.3

3.2

3.1

3.0

2.9

2.8

2.7

2.6

2.5

2.4

2.3

2.2

2.1

2.0

5V

12V

C3

R3

C5

C8

R9

L1

Q2

C1

L2

R4

C7

1

D1

R2

C4

R5A

R5B

R5C

R5D

R5E

2

3

4

5

6

7

8

JP1

R1

C2

R8

R6

C6

R7

Drv

Gnd

CS-/

CS+/

Drv2

SS/

U1