Data Sheet No. PD94121 revA
IRU1010-33(PbF)
1A LOW DROPOUT POSITIVE
FIXED 3.3V REGULATOR
DESCRIPTION
The IRU1010-33 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 IRU1010-33 is guaran-
teed to have <1.3V dropout at full load current making it
ideal to provide well regulated with 4.75V to 7V input
supply. The IRU1010-33 is specifically designed to be
stable with low cost aluminum capacitors while main-
taining stability with low ESR tantalum caps.
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, Ultra Thin-Pak
TM
and 8-Pin SOIC Surface-Mount Packages
APPLICATIONS
VGA & Sound Card Applications
Standard 3.3V Chip Set and Logic Applications
TYPICAL APPLICATION
5V
C1
10uF
V
IN
3
2
1
C2
10uF
IRU1010-33
V
OUT
3.3V / 1A
Gnd
Figure 1 - Typical application of IRU1010-33 in a 5V to 3.3V regulator.
PACKAGE ORDER INFORMATION
Basic Part (Non-Lead Free)
T
J
(°C)
0 To 150
2-PIN PLASTIC
TO-252 (D-Pak)
IRU1010-33CD
2-PIN PLASTIC
Ultra Thin-Pak
TM
(P)
IRU1010-33CP
8-PIN PLASTIC
SOIC (S)
IRU1010-33CS
3-PIN PLASTIC
SOT-223 (Y)
IRU1010-33CY
Leadfree Part
T
J
(°C)
0 To 150
2-PIN PLASTIC
TO-252 (D-Pak)
Not available
2-PIN PLASTIC
8-PIN PLASTIC
TM
Ultra Thin-Pak (P)
SOIC (S)
Not available
IRU1010-33CSPbF
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3-PIN PLASTIC
SOT-223 (Y)
Not available
1
IRU1010-33(PbF)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
) ....................................................
Power Dissipation .....................................................
Storage Temperature Range ......................................
Operating Junction Temperature Range .....................
7V
Internally Limited
-65°C To 150°C
0°C To 150°C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak)
2-PIN ULTRA THIN-PAK
TM
(P)
8-PIN PLASTIC SOIC (S)
3-PIN PLASTIC SOT-223 (Y)
3
V
IN
Tab is
V
OUT
3
V
IN
Tab is
V
OUT
1
Gnd
1
Gnd
V
IN
NC
NC
Gnd
1
2
3
4
8
7
6
5
V
OUT
V
OUT
V
OUT
V
OUT
3
V
IN
V
OUT
Gnd
Tab is
V
OUT
2
1
θ
JA
=70°C/W for 0.5" Sq pad
θ
JA
=70°C/W for 0.5" Sq pad
θ
JA
=55°C/W for 1" Sq pad
θ
JA
=90°C/W for 0.4" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over C
IN
=1µF, V
IN
=5V, C
OUT
=10µF, and T
J
=0 to 1258C.
Typical values refer to T
J
=258C.
PARAMETER
Output Voltage
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
Current Limit
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise
SYM
Vo
TEST CONDITION
Io=10mA, T
J
=258C
Io=10mA
Io=10mA, 4.75V<V
IN
<7V
10mA<Io<1A
Io=1A
∆Vo=100mV
30ms Pulse, Io=1A
f=120Hz, Co=25µF Tantalum,
Io=0.5A
Io=10mA
T
J
=1258C, 1000Hrs
T
J
=258C, 10Hz<f<10KHz
MIN
3.267
3.235
TYP
3.300
3.300
MAX
3.333
3.365
7
17
1.3
0.02
UNITS
V
mV
mV
V
A
%/W
dB
%
%
%Vo
1.1
0.01
60
70
0.5
0.3
0.003
1
Note 1:
Low duty cycle pulse testing with Kelvin connections is required in order to maintain accurate data.
Note 2:
Dropout voltage is defined as the minimum differential voltage between V
IN
and V
OUT
required to maintain
regulation at V
OUT
. It is measured when the output voltage drops 1% below its nominal value.
2
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IRU1010-33(PbF)
PIN DESCRIPTIONS
PIN#
1
2
3
PIN SYMBOL
Gnd
V
OUT
V
IN
PIN DESCRIPTION
Ground pin. This pin must be connected to ground plane using a low inductance short
connection.
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
V
IN
3
2 V
OUT
+
1.25V
CURRENT
LIMIT
THERMAL
SHUTDOWN
+
1 Gnd
Figure 2 - Simplified block diagram of the IRU1010-33.
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