US3033

4-4

Rev. 1.5

1/14/99

TYPICAL APPLICATION

TYPICAL APPLICATION

Pentium Dual Supply Application

Figure2- Typical application of US3033 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 Vcc2Det pin automatically shuts down the I/O regulator when a single plane

processor is dropped in the socket.

3033app2-1.3

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

1

2 3

4

5

6

7

8

Drv1V12swVfb1 Vhyst

Gnd

Vfb2

Drv2

V12

U1

R13

C9

R11

JP1

JP1

JP1

JP1

Output

1-2

3-4

5-6

7-8

Voltage

0

0

0

0

3.5

0

0

0

1

3.4

0

0

1

0

3.3

0

0

1

1

3.2

0

1

0

0

3.1

0

1

0

1

3.0

0

1

1

0

2.9

0

1

1

1

2.8

1

0

0

0

2.7

1

0

0

1

2.6

1

0

1

0

2.5

1

0

1

1

2.4

1

1

0

0

2.3

1

1

0

1

2.2

1

1

1

0

2.1

1

1

1

1

2.0

0 = Jumper block is installed.

1 = Jumper block is not installed.