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
7 PIN POWER FLEX (P)
FRONT VIEW
FRONT VIEW
FRONT VIEW
5
4
3
2
1
5
4
3
2
1
Vout1
Vin
Vout1
Vin
5
4
3
2
1
Vout1
Vin
Gnd
Vout2
Vctrl
Gnd
Gnd
Vout2
Vctrl
Vout2
Vctrl
qJT =2.7°C/W qJA =60°C/W
qJA =30°C/W for 1"sq pad
qJA =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
Output Voltage #2
3.0
V
Vo2
Vo1
Io=10mA, Tj=25°C
Io=10mA
Io=10mA, Tj=25°C
Io=10mA
1.485 1.500
1.470 1.500 1.530
2.462 2.500 2.537
1.515
V
V
Output Voltage #1
2.425 2.500 2.575
Line Regulation
Load Regulation (note 1)
Dropout Voltage (output #2)
Io=10mA, 3.1V<Vin<3.6V
10mA<Io<Ifl
Note 2,
0.2
0.4
%
%
Io=6A, Vctrl=4.75V
Note 2,
1.3
V
Dropout Voltage (output #1)
Io=1A, Vctrl=4.75V
dVo=100mV
dVo=100mV
0.4
0.6
V
A
A
Current Limit (output #2)
Current Limit (output #1)
Minimum Load Current
(note 3)
6.1
1.1
5
10
mA
ThermalRegulation
Ripple Rejection
30 mS PULSE,Io=Ifl
f=120HZ ,Co=25uF Tan
Io=0.5*Ifl
Io=10mA
Tj=125°C,1000Hrs
10hz<f<10khz
0.01
0.02
%/W
70
0.5
0.3
dB
%
%
Temperature Stability
Long Term Stability
RMS Output Noise
0.003
%Vo
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.
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.
Rev. 1.7
3/22/99
3-2
UNISEM [ UNISEM ]
