US1260
TYPICAL APPLICATION
RAMBUS APPLICATION
5V
2.5V
3.3V
C1
R1
R2
C2
C3
Vout1
Vin
7
6
5
4
3
2
1
U1
Vout2
Gnd
R3
R4
US1260
Vfb2
Vfb1
Vctrl
1260app6-1.0
Figure 5- Typical application of US1260 in the Rambusä design with the 2.5V output providing for memory
termination while 3.3V supplies the on board logic.
Notes:Rambus is trade mark of Rambus Corp.
Ref Desig
U1
C1,C2,C3
R1
R2,R4
R3
Description
Dual LDO Regulator
Capacitor
Resistor
Resistor
Qty Part #
Manuf
Unisem
1
3
1
2
1
US1260CM
Elect,220uF,6.3V,ECAOJFQ221 Panasonic
11 kW , 1%, SMT , 0805
10.2 kW , 1%, SMT , 0805
17.8 kW , 1%, SMT , 0805
Panasonic
Panasonic
Panasonic
Resistor
HS1
Heat Sink
1" Square Copper Pad area if Iout2<1.2A & Iout1<0.5A
For Iout2<3A & Iout1<0.5A Use Thermalloy 6030B
Rev. 1.9
3/22/99
3-8
UNISEM [ UNISEM ]
