IRU3033

4

Rev. 1.7

07/17/02

www.irf.com

TYPICAL APPLICATION

Pentium Dual Supply Application

0 = Jumper block is installed.

1 = Jumper block is not installed.

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

Figure 3 - Typical application of IRU3033 in a flexible motherboard with the 4-bit VID output voltage selection. This

circuit 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. The Vcc2 Det pin automati-

cally shuts down the I/O regulator when a single plane processor is dropped in the socket.

5V

5V

12V

Q1

C1

C3

R6

R7

C6

R8

R3

C5

D2

R10

C8

R9

L1

Q2

C2

L2

R4

C7

1

D1

R2

C4

R5A

R5B

R5C

R5D

R5E

2

3

4

5

6

7

8

JP1

R1

CPU

I/O

Vcc2 Det

Core

R13

C9

R11

Drv1

Gnd

Drv2

U1