Data Sheet No. PD94127 IRU1050-33 5A LOW DROPOUT POSITIVE FIXED 3.3V REGULATOR DESCRIPTION FEATURES Guaranteed < 1.3V Dropout at Full Load Current Fast Transient Response 1% Voltage Reference Initial Accuracy Output Current Limiting Built-In Thermal Shutdown The IRU1050-33 is a low dropout three-terminal fixed 3.3V output regulator with minimum of 5A output current capability. This product is specifically designed to provide well regulated supply for low voltage IC applications requiring 3.3V output. The IRU1050-33 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. APPLICATIONS Standard 3.3V Chip Set and Logic Applications TYPICAL APPLICATION 5V C1 330uF IRU1050-33 VIN 3 VOUT 2 3.3V / 5A C2 330uF Gnd 1 Figure 1 - Typical application of IRU1050-33. PACKAGE ORDER INFORMATION TJ (°C) 0 To 150 Rev. 1.3 04/22/02 3-PIN PLASTIC T0-220 (T) IRU1050-33CT 3-PIN PLASTIC TO-263 (M) IRU1050-33CM www.irf.com 2-PIN PLASTIC Ultra Thin-PakTM (P) IRU1050-33CP 2-PIN PLASTIC TO-252 (D-Pak) IRU1050-33CD 1 IRU1050-33 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 3-Pin Plastic TO-220 (T) 3-Pin Plastic TO-263 (M) 2-Pin Plastic ULTRA THIN-PAKTM (P) 2-Pin Plastic TO-252 (D-Pak) FRONT VIEW FRONT VIEW FRONT VIEW FRONT VIEW Tab is VOUT 3 VIN 2 VOUT 1 Gnd θJT=2.7°C/W θJA=60°C/W Tab is V OUT 3 V IN 2 V OUT 1 Gnd θJA=35°C/W for 1" Square pad 3 VIN Tab is VOUT 3 V IN 1 Gnd Tab is V OUT 1 Gnd θJA=70°C/W for 1" Square pad θJA=70°C/W for 0.5" Sq pad ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over CIN=1mF, COUT=10mF, and TJ=0 to 1508C. Typical values refer to TJ=258C. PARAMETER Output Voltage Line Regulation Load Regulation (Note 1) Dropout Voltage (Note 2) Current Limit Minimum Load Current (Note 3) Thermal Regulation Ripple Rejection Temperature Stability Long Term Stability RMS Output Noise SYM Vo DVo TEST CONDITION Io=10mA, TJ=258C, VIN=5V Io=10mA, VIN=5V Io=10mA, 4.7V<VIN<7V VIN=3.3V, 10mA<Io<5A Note 2, Io=5A VIN=5V, DVo=100mV VIN=5V 30ms Pulse, VIN-Vo=3V, Io=5A f=120Hz, Co=25mF Tantalum, Io=2.5A, VIN-Vo=3V VIN=5V, Io=10mA TJ=258C, 1000Hrs TJ=258C, 10Hz<f<10KHz 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 MIN 3.267 3.234 TYP 3.3 3.3 1.1 MAX 3.333 3.366 0.2 0.4 1.3 5 0.01 10 0.02 5.1 60 70 0.5 0.3 0.003 1 UNITS V % % V A mA %/W dB % % %Vo 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. www.irf.com Rev. 1.3 04/22/02 IRU1050-33 PIN DESCRIPTIONS PIN # PIN SYMBOL Gnd 1 PIN DESCRIPTION This pin must be connected to ground plane using a low inductance short connection. 2 VOUT The output of the regulator. A minimum of 10mF capacitor must be connected from this pin to ground to insure stability. 3 VIN 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 dropout voltage during the load transient response. This pin must always be 1.3V higher than V OUT in order for the device to regulate properly. BLOCK DIAGRAM VIN 3 2 VOUT + 1.25V + CURRENT LIMIT THERMAL SHUTDOWN 1 Gnd Figure 1 - Simplified block diagram of the IRU1050-33. APPLICATION INFORMATION Stability The IRU1050-33 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 100mV and an output capacitance of 500 to 1000mF. Fortunately as the capacitance increases, the ESR decreases resulting in a fixed RC time constant. The IRU1050-33 takes advantage of this phenomena in making the overall regulator loop stable. For most applications a minimum of 100mF 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. 1.3 04/22/02 www.irf.com 3 IRU1050-33 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 www.irf.com Rev. 1.3 04/22/02