US1261
TYPICAL APPLICATION
PENTIUM IIä APPLICATION
3.3V
C1
Vout1
Vin
5
4
3
2
1
2.5V / 1A
1.5V / 6A
C3
C4
Gnd
C2
US1261
Vout2
Vctrl
1261app1-1.3
5V
R1
Figure 4 - Typical application of US1261 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,C4
C3
C2
R1
Description
Dual LDO Regulator
Capacitor
Capacitor
Capacitor
Qty Part #
Manuf
Unisem
Panasonic
1
2
1
1
1
US1261CM
Elect,680uF,EEUFA1A681L
Elect,220uF,6.3V,ECAOJFQ221 Panasonic
Ceramic,1uF,16V,Z5U
Resistor
3W, 0.1W , 0805 SMT
Panasonic
HS1
Heat Sink 1)Use 1" Square Copper Pad area if Iout2<1.7A & Iout1<0.2A.
2)For Iout2<3A & Iout1<0.5A Use US1261CT and Thermalloy
6030B
3)For Iout2<5.4A & Iout1<0.5A Use US1261CT and Thermalloy
7021B
Rev. 1.7
3/22/99
3-6
UNISEM [ UNISEM ]
