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US1261CM 반도체 회로 부품 판매점

DUAL 6A AND 1A LOW DROPOUT POSITIVE FIXED OUTPUT REGULATOR



UNISEM 로고
UNISEM
US1261CM 데이터시트, 핀배열, 회로
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
APPLICATIONS
Pentium II Processor Applications
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.
TYPICAL APPLICATION
1261app1-1.3
3.3V
C1
Vout1 5
US1261
Vin 4
Gnd 3
Vout2 2
Vctrl 1
5V
R1
C2
2.5V / 1A
C3
1.5V / 6A
C4
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


US1261CM 데이터시트, 핀배열, 회로
US1261
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) ............................................................. 10V
Power Dissipation ............................................ Internally Limited
Storage Temperature Range ................................ -65°C TO 150°C
Operating Junction Temperature Range ...................... 0°C TO 150°C
PACKAGE INFORMATION
7 PIN PLASTIC TO220
7 PIN PLASTIC TO263
FRONT VIEW
5
4
3
2
1
Vout1
Vin
Gnd
Vout2
Vctrl
FRONT VIEW
5
4
3
2
1
Vout1
Vin
Gnd
Vout2
Vctrl
θJT =2.7°C/W θJA =60°C/W θJA =30°C/W for 1"sq pad
7 PIN POWER FLEX (P)
FRONT VIEW
5
4
3
2
1
Vout1
Vin
Gnd
Vout2
Vctrl
θJA =30°C/W for 1"sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over ,Cin=1 uF,Cout=100uF,and Tj=0 to 150°C.Typical
values refer to Tj=25°C. Ifl=6A for output #2 & 1A for output #1.Vctrl=5V,Vin=3.3V.
PARAMETER
SYM TEST CONDITION
MIN TYP MAX UNITS
Vctrl Input Voltage
3.0 V
Output Voltage #2
Vo2 Io=10mA, Tj=25°C
1.485 1.500 1.515
V
Io=10mA
1.470 1.500 1.530
Output Voltage #1
Vo1 Io=10mA, Tj=25°C
2.462 2.500 2.537
V
Io=10mA
2.425 2.500 2.575
Line Regulation
Io=10mA, 3.1V<Vin<3.6V
0.2 %
Load Regulation (note 1)
10mA<Io<Ifl
0.4 %
Dropout Voltage (output #2)
Note 2,
Io=6A, Vctrl=4.75V
1.3 V
Dropout Voltage (output #1)
Note 2,
Io=1A, Vctrl=4.75V
0.4 0.6
V
Current Limit (output #2)
dVo=100mV
6.1
A
Current Limit (output #1)
dVo=100mV
1.1
A
Minimum Load Current
5 10 mA
(note 3)
Thermal Regulation
30 mS PULSE,Io=Ifl
0.01 0.02 %/W
Ripple Rejection
f=120HZ ,Co=25uF Tan
Io=0.5*Ifl
70 dB
Temperature Stability
Io=10mA
0.5 %
Long Term Stability
Tj=125°C,1000 Hrs
0.3 %
RMS Output Noise
10hz<f<10khz
0.003
%Vo
Note 1 : Low duty cycle pulse testing with Kelvin con-
nections are required in order to maintain accurate data.
Note 2 : Drop-out voltage is defined as the minimum
differential voltage between Vin and Vout required to main-
tain regulation at Vout. It is measured when the output
voltage drops 1% below its nominal value.
Note 3 : Minimum load current is defined as the mini-
mum current required at the output in order for the out-
put voltage to maintain regulation. Typically the resistor
dividers are selected such that it automatically main-
tains this current.
3-2
Rev. 1.7
3/22/99




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