US1261 UNISEM, US1261 Datasheet - Page 2

• Manufacturer Part Number: US1261
• Description: DUAL 6A AND 1A LOW DROPOUT POSITIVE FIXED OUTPUT REGULATOR
• Manufacturer: UNISEM

US1261
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.
3-2
ABSOLUTE MAXIMUM RATINGS
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin)
Power Dissipation
Storage Temperature Range ................................
Operating Junction Temperature Range ...................... 0 C TO 150 C
PACKAGE INFORMATION
PACKAGE INFORMATION
ELECTRICAL SPECIFICATIONS
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
Vctrl Input Voltage
Output Voltage #2
Output Voltage #1
Line Regulation
Load Regulation (note 1)
Dropout Voltage (output #2)
Dropout Voltage (output #1)
Current Limit (output #2)
Current Limit (output #1)
Minimum Load Current
(note 3)
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise
7 PIN PLASTIC TO220
JT
=2.7 C/W
FRONT VIEW
5
4
3
2
1
JA
=60 C/W
............................................
.............................................................
Vout1
Gnd
Vctrl
Vin
Vout2
Vo2
Vo1
SYM
7 PIN PLASTIC TO263
JA
=30 C/W for 1"sq pad
FRONT VIEW
TEST CONDITION
Io=10mA, Tj=25 C
Io=10mA
Io=10mA, Tj=25 C
Io=10mA
Io=10mA, 3.1V<Vin<3.6V
10mA<Io<Ifl
Note 2,
Io=6A, Vctrl=4.75V
Note 2,
Io=1A, Vctrl=4.75V
dVo=100mV
dVo=100mV
30 mS PULSE,Io=Ifl
f=120HZ ,Co=25uF Tan
Io=10mA
Tj=125 C,1000 Hrs
10hz<f<10khz
Io=0.5*Ifl
5
4
3
2
1
Internally Limited
Vout1
Vin
Gnd
Vout2
Vctrl
-65 C TO 150 C
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.
10V
7 PIN POWER FLEX (P)
JA
=30 C/W for 1"sq pad
FRONT VIEW
1.485
2.462
1.470
2.425
MIN
3.0
6.1
1.1
5
4
3
2
1
1.500
2.500
1.500
2.500
Vout1
Vin
Gnd
Vout2
Vctrl
TYP
0.2
0.4
0.003
0.01
0.4
0.5
0.3
5
70
MAX
1.515
1.530
2.537
2.575
0.02
1.3
0.6
10
UNITS
%Vo
%/W
dB
mA
%
%
V
V
A
A
%
%
Rev. 1.7
V
V
V
3/22/99