SPX29300/01/02 3A Low Dropout Voltage Regulator October 2010 Rev. 2.1.0 GENERAL DESCRIPTION The SPX29300/01/02 are 3A, highly accurate voltage regulators with a low dropout voltage of 600mV (typical) at 3A. These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. They are fully fault protected against overcurrent, reverse battery, and positive and negative voltage transients. On-Chip trimming adjusts the reference voltage to 1% initial accuracy. The SPX29300 is offered in a 3-pin TO-263 package, the SPX29301 is offered in a 5-pin TO-263 while SPX29302 is offered in a 5-pin TO-263 and 5-pin TO-220 packages. APPLICATIONS * Adjustable Power Supplies * Constant Current Regulators * Audio and Video/Graphic Cards * Battery Chargers FEATURES * 3A Guaranteed Output Current * Low Dropout Voltage of 600mV @ 3A * Adjustable Output down to 1.25V * 1% Output Accuracy * Tight Load and Line Regulation * Fast Transient Response * Reverse Battery Protection * Zero Current Shutdown (SPX29301/02) * Power Good Flag (SPX29301) * Lead Free 3-Pin TO-263, 5-pin TO-220 and TO-263 Packages TYPICAL APPLICATION DIAGRAM Fig. 1: SPX29300 and SPX29302 Application Diagrams Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 - Fax. +1 510 668-7001 SPX29300/01/02 3A Low Dropout Voltage Regulator ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage Range VIN ........................................... 16V Junction Temperature Range ....................-40C to 125C Thermal Resistance ...................................................... TO-220-5 Junction to Ambient ....................... 29.3C/W TO-263-3 Junction to Ambient ....................... 31.4C/W TO-263-5 Junction to Ambient ....................... 31.2C/W TO-220-5, TO-263-3, TO-263-5 Junction to Case .. 3C/W Input Voltage VIN1 ................................................... 20V Storage Temperature .............................. -65C to 150C Lead Temperature (Soldering, 5 sec) ..................... 260C ESD Rating (HBM - Human Body Model) .......................... All pins except EN ................................................. 2kV En pin ................................................................. 1kV Note 1: Maximum positive supply voltage of 20V must be of limited duration (<100ms) and duty cycle of less than 1%. The maximum continuous supply voltage is 16V. ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of TJ = TA = 25C only; limits applying over the full Operating Junction Temperature range are denoted by a "*". Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25C, and are provided for reference purposes only. Unless otherwise indicated, VIN = VOUT + 1V and IOUT=10mA, CIN = 6.8F, COUT = 10F, TA= 25C. Parameter Min. Typ. Max. Units Conditions Fixed Voltage Versions 1.782 1.800 1.818 1.764 1.800 1.836 2.475 2.500 2.525 2.450 2.500 2.550 3.267 3.300 3.333 3.234 3.300 3.366 4.950 5.000 5.050 4.900 5.000 5.100 Line Regulation 0.06 0.5 Load Regulation 0.2 1 % V/T 20 100 ppm/C 120 300 Output Voltage, 1.8V Version Output Voltage, 2.5V Version Output Voltage, 3.3V Version Output Voltage, 5.0V Version V V V V IOUT=10mA * 10mAIOUT3A, 2.8VVIN16V IOUT=10mA * 10mAIOUT3A, 3.5VVIN16V IOUT=10mA * 10mAIOUT3A, 4.3VVIN16V IOUT=10mA * 10mAIOUT3A, 6.0VVIN16V All Voltage Versions Dropout Voltage Except 1.8V Version (note 3) Current Limit Output Noise Voltage Reference Voltage Temperature Coefficient * 800 * 30 60 * mA 3.0 0.9 mA 4.5 A 400 20 Adjust Pin Bias Current Adjust Pin Bias Current Temperature Coefficient (c) 2010 Exar Corporation 40 V 80 nA 120 0.1 IOUT=3A IOUT=1.5A VIN = 0.5V less than specified VOUT IOUT=10mA VOUT=0V (note 4) 10Hz-100KHz, IOUT=100mA, COUT=10F 10Hz-100KHz, IOUT=100mA, COUT=33F ppm/C Reference Voltage and Adjustable Pin - SPX29302 1.24 1.252 1.228 1.265 1.215 Reference Voltage 1.277 1.203 IOUT=100mA IOUT=3A VRMS 260 VOUT Temp Coefficient (note 6) IOUT=1.5A 600 40 Ground Pin Current at Dropout VIN=VOUT + 1V, 10mAIOUT IFL (note 2) * mV 380 Ground Current (note 5) IOUT=10mA, (VOUT+1V)VIN16V % Note 7 * VREFVOUT(VIN-1), 2.3VVIN16V 10mAILIFL, TJ<TJMAX * nA/C 2/10 Rev. 2.1.0 SPX29300/01/02 3A Low Dropout Voltage Regulator Parameter Min. Typ. Max. 0.01 1 2 300 400 Units Conditions Power Good Flag Output - SPX29301 Output Leakage Current 220 Output Low Voltage Upper Threshold Voltage 40 25 mV 60 75 Lower Threshold Voltage A mV 95 mV 140 Hysteresis 15 * * * * VOH=16V Device set for 5V, VIN=4.5V, IOL=250A Device set for 5V, Note 8 Device set for 5V, Note 8 Device set for 5V, Note 8 mV Enable Input - SPX29301/02 Input Logic Voltage Low (OFF) Input Logic Voltage High (ON) 0.8 2.4 100 Enable Input Pin Regulator Output Current in Shutdown V 10 600 750 1 2 A 500 A * * * * * * VIN<10V VEN=16V VEN=0.8V Note 9 Note 2: Full load current (IFL) is defined as 3.0A. Note 3: Dropout voltage is defined (VIN-VOUT) when the output voltage drops to 99% of its nominal value. Note 4: VIN=VOUT(nom)+1V. Use pulse-testing procedures to minimize temperature rise. Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current. Note 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range Note 7: Thermal regulation is defined as the change in output voltage at time T after a change in power dissipation is applied, excluding load/line regulation effects. Specifications for a 200mA load pulse as VIN=20V (a 4W pulse) for t=10ms. Note 8: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To express these thresholds in terms of output voltage change, multiply the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmable output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 383mV. Threshold remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. Note 9: VEN 0.8V and VIN 16V, VOUT = 0. BLOCK DIAGRAM Fig. 2: SPX29300/01/02 Block Diagram (c) 2010 Exar Corporation 3/10 Rev. 2.1.0 SPX29300/01/02 3A Low Dropout Voltage Regulator PIN ASSIGNMENT Fig. 3: SPX29300/01/02 Pin Assignment ORDERING INFORMATION Part Number Junction Temperature Range SPX29300T-L-1-8 -40CTJ+125C SPX29300T-L-1-8/TR -40CTJ+125C SPX29300T-L-2-5 -40CTJ+125C SPX29300T-L-2-5/TR -40CTJ+125C SPX29300T-L-3-3 -40CTJ+125C SPX29300T-L-3-3/TR -40CTJ+125C SPX29300T-L-5-0 -40CTJ+125C SPX29300T-L-5-0/TR -40CTJ+125C SPX29301T5-L-3-3 -40CTJ+125C SPX29301T5-L-3-3/TR -40CTJ+125C SPX29301T5-L-5-0 -40CTJ+125C SPX29301T5-L-5-0/TR -40CTJ+125C SPX29302T5-L -40CTJ+125C SPX29302T5-L/TR -40CTJ+125C SPX29302U5-L -40CTJ+125C Marking Package SPX29300T 18YYWWLX SPX29300T 18YYWWLX SPX29300T 25YYWWLX SPX29300T 25YYWWLX SPX29300T 33YYWWLX SPX29300T 33YYWWLX SPX29300T 50YYWWLX SPX29300T 50YYWWLX 293001T5 33YYWWLX 293001T5 33YYWWLX 293001T5 50YYWWLX 293001T5 50YYWWLX 29302T5 YYWWLX 29302T5 YYWWLX 29302U5 YYWWLX 3-pin TO263 3-pin TO263 3-pin TO263 3-pin TO263 3-pin TO263 3-pin TO263 3-pin TO263 3-pin TO263 5-pin TO263 5-pin TO263 5-pin TO263 5-pin TO263 5-pin TO263 5-pin TO263 5-pin TO220 Packing Quantity Bulk Note 1 Note 2 Lead Free 500/Tape & Reel Lead Free Bulk Lead Free 500/Tape & Reel Lead Free Bulk Lead Free 500/Tape & Reel Lead Free Bulk Lead Free 500/Tape & Reel Lead Free Bulk Lead Free 500/Tape & Reel Lead Free Bulk Lead Free 500/Tape & Reel Lead Free Bulk Lead Free 500/Tape & Reel Lead Free Bulk Lead Free "YY" = Year - "WW" = Work Week - "L" = Lead Free Designator - "X" = Lot Number (c) 2010 Exar Corporation 4/10 Rev. 2.1.0 SPX29300/01/02 3A Low Dropout Voltage Regulator TYPICAL PERFORMANCE CHARACTERISTICS All data taken at VIN = VOUT + 1V, TJ = TA = 25C, unless otherwise specified. Fig. 4: Dropout Voltage vs Load Current Fig. 5: Startup Fig. 6: Line Regulation IOUT=10mA, VOUT=3.3V Fig. 7: Load Regulation VOUT=3.3V (c) 2010 Exar Corporation 5/10 Rev. 2.1.0 SPX29300/01/02 3A Low Dropout Voltage Regulator capacitor will guarantee stability over all load conditions. A tantalum capacitor is recommended if a faster load transient response is needed. If the power source has high AC impedance, a 0.1F ceramic capacitor between input & ground is recommended. THEORY OF OPERATION The SPX29300/01/02 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. THERMAL CONSIDERATIONS MINIMUM LOAD CURRENT Although the SPX29300/01/02 offers limiting circuitry for overload conditions, it is still necessary to insure that the maximum junction temperature is not exceeded in the application. Heat will flow through the lowest resistance path, the junction-to-case path. In order to insure the best thermal flow of the component, proper mounting is required. To ensure a proper behavior of the regulator under light load, a minimum load of 5mA for SPX29300/01/02 is required. ADJUSTABLE REGULATOR DESIGN The SPX29300/01/02 is an adjustable regulator that can be programmed to any value between 1.25V and 16V using 2 external resistors, R1 and R2. The relationship between the resistors and the output voltage is: TO-220 DESIGN EXAMPLE: Assume that VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50C, HA= 1C/W, CH= 2C/W, and JC= 3C/W, where: 1.240 TA = ambient temperature, 1 HA= heatsink to ambient thermal resistance ERROR FLAG CH= case to heatsink thermal resistance The SPX29301 features an error flag that indicates either an over current or under current voltage condition. The flag output goes low, sinking 10mA when either conditions occurs. JC = junction to case thermal resistance The power calculated under these conditions is: ENABLE INPUT 7.5 The SPX29301/02 has an Enable function that switches the regulator on and off. Their thresholds are TTL compatible. When the regulator is active, approximately 20A flows through the Enable pin. And the junction temperature is calculated as TYPICAL APPLICATION CIRCUITS or 50 7.5 Reliable operation Requirements 1 2 is 3 95 Figure 1 represents the typical implementation for an adjustable output regulator. The values of R1 and R2 set the output voltage value as follows: insured.Capacitor 1 CAPACITOR REQUIREMENTS A minimum value of 10kohms is recommended for R2 with a range between 10k and 47k. The output capacitor is needed to insure stability and minimize the output noise. The value of the capacitor varies with the load. However, a minimum value of 10F aluminum (c) 2010 Exar Corporation 6/10 Rev. 2.1.0 SPX29300/01/02 3A Low Dropout Voltage Regulator PACKAGE SPECIFICATION 3-PIN TO-263 (c) 2010 Exar Corporation 7/10 Rev. 2.1.0 SPX29300/01/02 3A Low Dropout Voltage Regulator 5-PIN TO-263 (c) 2010 Exar Corporation 8/10 Rev. 2.1.0 SPX29300/01/02 3A Low Dropout Voltage Regulator 5-PIN TO-220 (c) 2010 Exar Corporation 9/10 Rev. 2.1.0 SPX29300/01/02 3A Low Dropout Voltage Regulator REVISION HISTORY Revision Date 1.0.0 12/17/2009 Initial Release of Datasheet Description 2.0.0 03/31/2010 Reformat of datasheet Inserted ESD data Modified Dropout Voltage and Ground Current values in electrical characteristics table Corrected typographical error in result of calculus in note 8 Removed "Gound Current vs Load Current", "Enable Threshold vs Temperature" and "Power Supply Rejection Ratio curves" Updated "Dropout Voltage vs Load Current", "Line Regulation" and "Load Regulation" curves Added "start Up" curve 2.1.0 10/19/2010 Corrected Adjustable Regulator Design paragraph equation FOR FURTHER ASSISTANCE Email: customersupport@exar.com Exar Technical Documentation: http://www.exar.com/TechDoc/default.aspx? EXAR CORPORATION HEADQUARTERS AND SALES OFFICES 48720 Kato Road Fremont, CA 94538 - USA Tel.: +1 (510) 668-7000 Fax: +1 (510) 668-7030 www.exar.com NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. or its in all Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. (c) 2010 Exar Corporation 10/10 Rev. 2.1.0