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Data Sheet No. PD94121
IRU1010-33
1A LOW DROPOUT POSITIVE FIXED 3.3V REGULATOR DESCRIPTION
The IRU1010-33 is a low dropout three-terminal fixed output regulator with minimum of 1A 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 IRU1010-33 is guaranteed 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 maintaining 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 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 Vin
3 2 1
C2 10uF
IRU1010-33
Vout
3.3V / 1A
Gnd
Figure 1 - Typical application of IRU1010-33 in a 5V to 3.3V regulator
PACKAGE ORDER INFORMATION
Tj (C) 0 To 150 2-PIN PLASTIC TO-252 (D-Pak) IRU1010-33CD 3-PIN PLASTIC SOT-223 (Y) IRU1010-33CY 2-PIN PLASTIC Ultra Thin-Pak (P) IRU1010-33CP 8-PIN PLASTIC SOIC (S) IRU1010-33CS
Rev. 1.3 06/29/01
1
IRU1010-33
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) .................................................... Power Dissipation ..................................................... Storage Temperature Range ...................................... Operating Junction Temperature Range ..................... 7V Internally Limited -65C To 150C 0C To 150C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak)
FRONT VIEW 3
3-PIN PLASTIC SOT-223 (Y)
2-PIN ULTRA THIN-PAK (P)
FRONT VIEW
8-PIN PLASTIC SOIC (S)
TOP VIEW
Vin Tab is Vout
TOP VIEW 3 2 1
Vin Vout Gnd
3
Vin
Tab is Vout
1
Tab is Vout
1
Gnd
Gnd
Vin NC NC Gnd
1 2 3 4
8 7 6 5
Vout Vout Vout Vout
JA=70C/W for 0.5" Sq pad
JA=90C/W for 0.4" Sq pad
JA=70C/W for 0.5" Sq pad
JA=55C/W for 1" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Cin=1F, Vin=5V, Cout=10F, 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 Temperature Stability Long Term Stability RMS Output Noise SYM Vo TEST CONDITION Io=10mA,Tj=25!C Io=10mA Io=10mA, 4.75V1.1 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 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
IRU1010-33
PIN DESCRIPTIONS
PIN# 1 2 3 PIN SYMBOL Gnd Vout Vin 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
Vin 3 2 Vout
+
1.25V CURRENT LIMIT THERMAL SHUTDOWN
+
1010-33blk1-1.0
1 Gnd
Figure 2 - Simplified block diagram of the IRU1010-33
Rev. 1.3 06/29/01
3
IRU1010-33
Notes
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
4
Rev. 1.3 06/29/01

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