Datasheet IRU1117-33CY, IRU1117-33CS, IRU1117-33CP, IRU1117-33CD Datasheet (International Rectifier)
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Data Sheet No. PD94172
IRU1117-33
800mA LOW DROPOUT POSITIVE
FIXED 3.3V REGULATOR
FEATURES
Guaranteed < 1.2V Dropout at 800mA Load
Current
Fast Transient Response
1% Output Voltage Initial Accuracy
Built-In Thermal Shutdown
Available in SOT-223, D-Pak, Ultra Thin-Pak
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
DESCRIPTION
The IRU1117-33 is a low dropout three-terminal fixed output regulator with minimum of 800mA output current capability. This product is specifically designed to provide
well regulated supply for low voltage IC applications such
as VGA, sound & DVD cards. The IRU1117-33 is guaranteed to have <1.2V dropout at full load current making
it ideal to provide well regulated with 4.75V to 7V input
supply. The IRU1117-33 is specifically designed to be
stable with low cost aluminum capacitors while maintaining stability with low ESR tantalum caps.
Vin
3
IRU1117-33
Vout
2
Gnd
1
Figure 1 - Typical application of IRU1117-33 in a 5V to 3.3V regulator
PACKAGE ORDER INFORMATION
Tj (°C) 2-PIN PLASTIC 3-PIN PLASTIC 2-PIN PLASTIC 8-PIN PLASTIC
TO-252 (D-Pak) SOT-223 (Y) Ultra Thin-Pak (P) SOIC (S)
0 To 150 IRU1117-33CD IRU1117-33CY IRU1117-33CP IRU1117-33CS
3.3V / 800mA
C2
10uF
Rev. 1.3
06/29/01
1
Page 2
IRU1117-33
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 TO-252 (D-Pak) 3-PIN PLASTIC SOT-223 (Y) 2-PIN ULTRA THIN-PAK (P) 8-PIN PLASTIC SOIC (S)
Tab is
Vout
FRONT VIEW
3
Vin
1
Gnd
Tab i s
Vou t
TOP VIEW
3
Vin
2
Vou t
1
Gnd
θJA=70°C/W for 0.5" Sq pad θJA=90°C/W for 0.4" Sq pad θJA=70°C/W for 0.5" Sq pad θJA=55°C/W for 1" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Cin=1µF, Vin=5V, Cout=10µF, and Tj=0 to 125!C.
Typical values refer to Tj=25!C.
Tab is
Vout
FRONT VIEW
3
Vin
1
Gnd
Vin
NC
NC
TOP VIEW
1
2
3
4
8
Vout
7
Vout
6
Vout
5
VoutGnd
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Output Voltage Vo Io=10mA,Tj=25!C 3.267 3.300 3.333 V
Io=10mA 3.235 3.300 3.365
Line Regulation Io=10mA, 4.75V<Vin<7V 7 mV
Load Regulation (Note 1) 10mA<Io<800mA 17 mV
Dropout Voltage (Note 2) Io=1A 1.3
Io=800mA 1.2 V
Current Limit dVo=100mV 1.1 A
Thermal Regulation 30ms Pulse, Io=800mA 0.01 0.02 %/W
Ripple Rejection f=120Hz, Co=25µF Tantalum,
Io=0.5A 60 70 dB
Temperature Stability Io=10mA 0.5 %
Long Term Stability Tj=125!C, 1000Hrs 0.3 1 %
RMS Output Noise Tj=25!C, 10Hz<f<10KHz 0.003 %Vo
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 Vin and Vout required to maintain
regulation at Vout. It is measured when the output voltage drops 1% below its nominal value.
2
Rev. 1.3
06/29/01
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PIN DESCRIPTIONS
PIN# PIN SYMBOL PIN DESCRIPTION
1
Gnd
Ground pin. This pin must be connected to ground plane using a low inductance short
connection.
IRU1117-33
2
3
Vout
Vin
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. Typically a large storage capacitor is connected from this pin to
ground to insure that the input voltage does not sag below the minimum dropout voltage
during the load transient response. This pin must always be 1.3V higher than Vout in order
for the device to regulate properly.
BLOCK DIAGRAM
Vin 3
CURRENT
LIMIT
2 Vout
+
1.25V
+
Rev. 1.3
06/29/01
THERMAL
SHUTDOWN
1117-33blk1-1.0
Figure 2 - Simplified block diagram of the IRU1117-33
1 Gnd
3
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IRU1117-33
Notes
4
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 02/01
Rev. 1.3
06/29/01
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