US1261
DUAL 6A AND 1A LOW DROPOUT
POSITIVE FIXED OUTPUT REGULATOR
FEATURES
Guaranteed to provide 1.5V and 2.5V Sup-
plies with 3.1V input.
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built in Thermal Shutdown
DESCRIPTION
The US1261 product using a
proprietary process
com-
bines a dual low dropout regulators with fixed outputs of
1.5V and 2.5V in a
single package
with the 1.5V out-
put having a minimum of
6A
and the 2.5V having a
1A
output current capability. This product is specifically de-
signed to provide well regulated supplies from
3.3V to
generate 1.5V for GTL+ termination resistor supply
and 2.5V clock supply for the new generation of
the Pentium II processor
applications.
APPLICATIONS
Pentium II Processor Applications
TYPICAL APPLICATION
3.3V
C1
Vout1
Vin
5
4
3
2
1
C4
C2
C3
2.5V / 1A
US1261
Gnd
Vout2
Vctrl
1.5V / 6A
1261app1-1.3
5V
R1
Typical application of US1261 in a Pentium II processor application
PACKAGE ORDER INFORMATION
Tj (
°
C)
0 TO 150
5 PIN PLASTIC
TO220(T)
US1261CT
5 PIN PLASTIC
TO263(M)
US1261CM
5 PIN PLASTIC
POWER FLEX(P)
US1261CP
Rev. 1.7
3/22/99
3-1
UNISEM [ UNISEM ]
