US3034
TYPICAL APPLICATION
Pentium Core Supply Application (US3034 and US3033 Dual Layout)
Low Cost 4 Bit VID
**
R9
12V
C6
C8
8
7 6 5
** R9 can be elimi-
nated if dual layout
with US3033 is not
desired.
SS/ CS+/ CS-/ Gnd
V12 Drv2 Vfb2
U1
Drv V12 Vfb Vhyst
R8
R7
1
2 3 4
C3
R1
R3
C5
L2
R6
Vout
C7
L1
5V
Q2
R4
C1
C2
C4
R2
R5A
R5B
R5C
R5D
R5E
D1
JP1
1
2
3
4
5
7
6
8
3034app2-1.0
Figure2- Typical application of US3034 in a flexible motherboard with the 4 bit VID output voltage selection. This circuit is done
using a dual layout with the US3033 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.
JP1 JP1
JP1
5-6
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
JP1
7-8
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
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
1-2
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
3-4
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0 = Jumper block is installed.
1 = Jumper block is not installed.
1
1
2.0
Rev. 1.8
1/13/99
4-4
UNISEM [ UNISEM ]
