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| Data Sheet No. PD94137 IRU1117-18 800mA LOW DROPOUT POSITIVE FIXED 1.8V REGULATOR PRELIMINARY DATA SHEET FEATURES Guaranteed < 1.2V Dropout at 800mA Load Current Fast Transient Response 1% Voltage Reference Initial Accuracy Built-In Thermal Shutdown Available in SOT-223, D-Pak, Ultra Thin-Pak and 8-Pin SOIC Surface-Mount Packages DESCRIPTION The IRU1117-18 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 as well as generating clock supply for PC applications. The IRU1117-18 is guaranteed to have <1.2V dropout at full load current making it ideal to provide well regulated with 3.8V input supply. The IRU1117-18 is specifically designed to be stable with low cost aluminum capacitors while maintaining stability with low ESR tantalum caps. APPLICATIONS Low Voltage IC Supply Applications PC Clock Supply Voltage TYPICAL APPLICATION 3.3V C1 10uF Vin 3 2 1 C2 10uF IRU1117-18 Vout 1.8V / 800mA Gnd Figure 1 - Typical set-up of the IRU1117-18 in a 3.3V to 1.8V regulator application PACKAGE ORDER INFORMATION Tj (C) 0 To 125 2-PIN PLASTIC TO-252 (D-Pak) IRU1117-18CD 3-PIN PLASTIC SOT-223 (Y) IRU1117-18CY 2-PIN PLASTIC Ultra Thin-Pak (P) IRU1117-18CP 8-PIN PLASTIC SOIC (S) IRU1117-18CS Rev. 1.1 06/29/01 1 IRU1117-18 ABSOLUTE MAXIMUM RATINGS Input Voltage (Vin) .................................................... Power Dissipation ..................................................... Storage Temperature Range ...................................... Operating Junction Temperature Range ..................... 7V Internally Limited -65C To 150C 0C To 125C PACKAGE INFORMATION 2-PIN PLASTIC TO-252 (D-Pak) FRONT VIEW 3 3-PIN PLASTIC SOT-223 (Y) TOP VIEW 3 2-PIN ULTRA THIN-PAK (P) FRONT VIEW 8-PIN PLASTIC SOIC (S) TOP VIEW Vin Tab is Vout Tab is Vout 1 Vin Vout Gnd Tab is Vout 3 Vin 2 1 Gnd 1 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, 4.75V 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. 1.1 06/29/01 IRU1117-18 PIN DESCRIPTIONS PIN# 1 2 3 PIN SYMBOL PIN DESCRIPTION Ground pin. This pin must be connected to ground plane using a low inductance short Gnd connection. 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 2 Vout + 1.25V CURRENT LIMIT THERMAL SHUTDOWN + 1117-18blk1-1.0 1 Gnd Figure 2 - Simplified block diagram of the IRU1117-18 Rev. 1.1 06/29/01 3 IRU1117-18 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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