US1260
TYPICAL APPLICATION
PENTIUM IIä APPLICATION
3.3V
2.5V / 1A
1.5V / 6A
C1
R1
R2
C2
C3
Vout1
Vin
7
6
5
4
3
2
1
U1
Vout2
Gnd
R3
R4
C4
US1260
Vfb2
Vfb1
Vctrl
R5
C5
1260app7-1.0
5V
Figure 4 - Typical application of US1260 in the Pentium IIä design with the 1.5V output providing for GTL+
termination while 2.5V supplies the clock chip.
Notes: Pentium II is trade mark of Intel Corp.
Ref Desig
U1
C1,C3
C2
C4
C5
R1
R2,R4
R3
Description
Dual LDO Regulator
Capacitor
Capacitor
Capacitor
Capacitor
Resistor
Resistor
Resistor
Resistor
Qty Part #
Manuf
Unisem
Panasonic
1
2
1
1
1
1
2
1
1
US1260CM
Elect,680uF,EEUFA1A681L
Elect,220uF,6.3V,ECAOJFQ221 Panasonic
Ceramic, 0.1 uF, SMT , 0805 Panasonic
Elect,100uF,6.3V,ECAOJFQ101 Panasonic
11 kW , 1%, SMT , 0805
10.2 kW , 1%, SMT , 0805
2.55 kW , 1%, SMT , 0805
3 W , 5%, SMT , 0805
Panasonic
Panasonic
Panasonic
Panasonic
R5
HS1
Heat Sink
Use 1" Square Copper Pad area if Iout2<1.7A & Iout1<0.2A
For Iout2<3A & Iout1<0.5A Use US1260CT and Thermalloy
6030B
Rev. 1.9
3/22/99
3-7
UNISEM [ UNISEM ]
