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| Data Sheet No. PD94125 IRU1030-33 3A LOW DROPOUT POSITIVE FIXED 3.3V REGULATOR DESCRIPTION The IRU1030-33 is a low dropout three-terminal fixed 3.3V output regulator with minimum of 3A output current capability. This product is specifically designed to provide well regulated supply for low voltage IC applications requiring 3.3V output. The IRU1030-33 is guaranteed to have <1.3V dropout at full load current making it ideal to provide well regulated output with supply voltage as low as 4.6V input. FEATURES Guaranteed < 1.3V Dropout at Full Load Current Fast Transient Response 1% Voltage Reference Initial Accuracy Output Current Limiting Built-In Thermal Shutdown APPLICATIONS Standard 3.3V Chip Set and Logic Applications TYPICAL APPLICATION 5V C1 330uF Vin 3 IRU1030-33 Vout 2 C2 330uF 3.3V / 3A Gnd 1 Figure 1 - Typical application of IRU1030-33 TYPICAL APPLICATION Tj (C) 0 To 150 3-PIN PLASTIC TO-220 (T) IRU1030-33CT 3-PIN PLASTIC TO-263 (M) IRU1030-33CM 2-PIN PLASTIC Ultra Thin-Pak (P) IRU1030-33CP 2-PIN PLASTIC TO-252 (D-Pak) IRU1030-33CD Rev. 1.1 06/29/01 1 IRU1030-33 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 3-PIN PLASTIC TO-220 (T) FRONT VIEW 3 3-PIN PLASTIC TO-263 (M) FRONT VIEW 2-PIN PLASTIC ULTRA THIN-PAK (P) FRONT VIEW 2-PIN PLASTIC TO-252 (D-Pak) FRONT VIEW Vin Vout Gnd 3 Vin Vout Gnd 3 Vin Tab is Vout 3 Vin Tab is Vout 2 Tab is Vout 2 Tab is Vout 1 1 1 Gnd 1 Gnd JT=2.7C/W JA=60C/W JA=35C/W for 1" Square pad JA=70C/W for 1" Square pad JA=70C/W for 0.5" Sq pad ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Cin=1F, Cout=10F, and Tj=0 to 150!C. Typical values refer to Tj=25!C. PARAMETER Output Voltage Line Regulation Load Regulation (Note 1) Dropout Voltage (Note 2) Current Limit Minimum Load Current (Note 3) Thermal Regulation Ripple Rejection Adjust Pin Current Change Temperature Stability Long Term Stability RMS Output Noise SYM Vo TEST CONDITION Io=10mA,Tj=25!C,Vin=5V Io=10mA, Vin=5V Io=10mA, 4.7V 1.1 3.1 5 0.01 60 70 0.2 0.5 0.3 0.003 5 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. Note 3: Minimum load current is defined as the minimum current required at the output in order for the output voltage to maintain regulation. Typically the resistor dividers are selected such that it automatically maintains this current. 2 Rev. 1.1 06/29/01 IRU1030-33 PIN DESCRIPTIONS PIN # 1 2 3 PIN SYMBOL PIN DESCRIPTION Gnd This pin must be connected to ground plane using a low inductance short connection. Vout Vin The output of the regulator. A minimum of 10F capacitor must be connected from this pin to ground to insure stability. The 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 drop out 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 2 Vout + 1.25V CURRENT LIMIT THERMAL SHUTDOWN + 1030-33blk1-1.0 1 Gnd Figure 2 - Simplified block diagram of the IRU1030-33 APPLICATION INFORMATION Stability The IRU1030-33 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. Typical designs for microprocessor applications use standard electrolytic capacitors with a typical ESR in the range of 50 to 100m and an output capacitance of 500 to 1000F. Fortunately as the capacitance increases, the ESR decreases resulting in a fixed RC time constant. The IRU1030-33 takes advantage of this phenomena in making the overall regulator loop stable. For most applications a minimum of 100F aluminum electrolytic capacitor such as Sanyo MVGX series, Panasonic FA series as well as the Nichicon PL series insures both stability and good transient response. Rev. 1.1 06/29/01 3 IRU1030-33 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. 1.1 06/29/01 |
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