US3034CS UNISEM, US3034CS Datasheet - Page 4

• Manufacturer Part Number: US3034CS
• Description: 8 PIN PWM SWITCHER CONTROLLER IC
• Manufacturer: UNISEM

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