US1010-33
1A LOW DROPOUT POSITIVE
FIXED OUTPUT REGULATOR
FEATURES
Guaranteed < 1.3V Dropout at Full Load
Current
Fast Transient Response
1% Output Voltage Initial Accuracy
Built-in Thermal Shutdown
Available in SOT-223, D-PAK , Power Flex
and 8 pin SOIC Surface Mount Packages
DESCRIPTION
PRELIMINARY DATASHEET
APPLICATIONS
VGA & Sound Card Applications
Standard 3.3V Chip-Set and Logic Applications
The US1010-33 is a low dropout three terminal fixed out-
put regulator with minimum of 1A output current capabil-
ity. This product is specifically designed to provide well
regulated supply for low voltage IC applications such as
VGA , sound & DVD cards. The US 1010 is
guaran-
teed to have <1.3V drop out at full load current
making it ideal to provide well regulated with 4.75V to
7V input supply. The US1010 is specifically designed to
be stable with low cost Aluminimum capacitors while
still maintains stability with low ESR tantalum caps as
well.
TYPICAL APPLICATION
5V
C1
10uF
Vin
3
2
C2
10uF
US1010-33
Vout
3.3V / 1A
Gnd
1010-33app1-1.0
1
Typical Application of US1010-33 in a 5V to 3.3V regulator .
PACKAGE ORDER INFORMATION
Tj (°C)
0 TO 150
2 PIN PLASTIC
TO252 (D)
US1010-33CD
3 PIN PLASTIC
SOT223 (Y)
US1010-33CY
2 PIN PLASTIC
POWER FLEX (P)
US1010-33CP
8 PIN PLASTIC
SOIC (S)
US1010-33CS
Rev. 1.2
10/30/00
2-1
US1010-33
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) .................................................................. 7V
Power Dissipation ............................................ Internally Limited
Storage Temperature Range .............................. -65
°
C TO 150
°
C
Operating Junction Temperature Range .................. 0
°
C TO 150
°
C
PACKAGE INFORMATION
2 PIN PLASTIC TO252 ( D )
FRONT VIEW
3
3 PIN PLASTIC SOT223 ( Y )
TOP VIEW
2 PIN POWER FLEX ( P )
FRONT VIEW
3 PIN PLASTIC SOT223 ( Y )
TOP VIEW
Vin
3
Vin
Vout
Gnd
Tab is
4
Vout
1
Tab is
Vout
Gnd
Tab is
Vout
4
3
Vin
2
1
1
Gnd
Vin
NC
NC
Gnd
1
2
3
4
8
7
6
5
Vout
Vout
Vout
Vout
θ
JA
=70°C/W for 0.5" Sq pad
θ
JA
=90°C/W for 0.4" Sq pad
θ
JA
=70°C/W for 0.5" Sq pad
θ
JA
=55°C/W for 1" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over, Cin=1uF, Vin=5V,Cout=10uF, and Tj=0 to 125°C.Typical
values refer to Tj=25°C.
PARAMETER
Output Voltage
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
Current Limit
Thermal Regulation
Ripple Rejection
SYM
Vo
TEST CONDITION
Io=10mA,Tj=25°C
Io=10mA
Io=10mA,4.75V<Vin<7V
10mA<Io<1A
Io=1A
dVo=100mV
30 mS PULSE, Io=1A
f=120HZ ,Co=25uF Tan
Io=0.5A
Io=10mA
Tj=125°C,1000 Hrs
Tj=25°C 10hz<f<10khz
MIN
TYP
3.267 3.300
3.235 3.300
MAX
3.333
3.365
7
17
1.3
UNITS
V
mV
mV
V
A
%/W
dB
%
%
%Vo
1.1
0.01
60
70
0.5
0.3
0.003
0.02
Temperature Stability
Long Term Stability
RMS Output Noise
1
Note 1 :
Low duty cycle pulse testing with Kelvin connections 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 maintain
regulation at Vout. It is measured when the output voltage drops 1% below its nominal value.
2-2
Rev. 1.2
10/30/00
US1010-33
PIN DESCRIPTIONS
PIN# PIN SYMBOL
1
Gnd
2
3
Vout
Vin
Pin Description
Gnd pin. This pin must be connected to GND plane using a low inductance short connec-
tion.
The output of the regulator. This pin is also connected to the tab of the package. An
output capacitor must be connected to this pin to insure stability of the regulator.
Input pin of the regulator.
BLOCK DIAGRAM
Vin 3
2 Vout
+
+
1.25V
CURRENT
LIMIT
THERMAL
SHUTDOWN
1 Gnd
1010-33blk1-1.0
Figure 1 - Simplified block diagram of the US1010-33
Rev. 1.2
10/30/00
2-3
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