SSPPXX22994400 11AA LLooww DDrrooppoouutt VVoollttaaggee RReegguullaattoorr August 2009 Rev. 2.0.0 GENERAL DESCRIPTION APPLICATIONS The SPX2940 is a 1A, accurate voltage Power Supplies regulators with a low drop out voltage of LCD Monitors 280mV (typical) at 1A. Portable Instrumentation These regulators are specifically designed for Medical and Industrial Equipments low voltage applications that require a low dropout voltage and a fast transient response. They are fully fault protected against over- FEATURES current, reverse battery, and positive and negative voltage transients. Guaranteed 1.5A Peak Current The SPX2940 is offered in 3-pin TO-220 & TO- Low Quiescent Current 263 packages. For a 3A version, refer to the Low Dropout Voltage of 280mV at 1A SPX29300 data sheet. Extremely Tight Load and Line Regulation Extremely Fast Transient Response Reverse-battery Protection Internal Thermal Protection Internal Short Circuit Current Limit Replacement for LM2940, MIC2940A, AS2940 Standard TO-220 and TO-263 packages TYPICAL APPLICATION DIAGRAM Fig. 1: SPX2940 Application Diagram Fixed Output Linear Regulator Exar Corporation www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 SSPPXX22994400 11AA LLooww DDrrooppoouutt VVoollttaaggee RReegguullaattoorr ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of Junction Temperature Range .................... -40C to 125C the device at these ratings or any other above those TO-220 Package indicated in the operation sections of the specifications Thermal Resistance, Junction to Case (at T ) .......... 4C/W A below is not implied. Exposure to absolute maximum TO-263 Package rating conditions for extended periods of time may affect Thermal Resistance, Junction to Case (at T ) .......... 4C/W A reliability. 1 Note 1: Maximum positive supply voltage of 20V must be Input Voltage V ................................................... 16V IN of limited duration (<100ms) and duty cycle (<1%). The Storage Temperature .............................. -65C to 150C maximum continuous supply voltage is 16V. Lead Temperature (Soldering, 5 sec) ..................... 260C ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Ambient Temperature of T = 25C only limits applying over the full A 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 T = 25C, and are provided A for reference purposes only. Unless otherwise indicated, V = V +1V, I = 10mA, C = 6.8F, C = 10F, T = 25C. IN IN OUT IN OUT A Parameter Min. Typ. Max. Units Conditions 5.0V version 4.850 5.0 5.150 V I =10mA OUT Output Voltage 10mA I 1A, 6V V 16V 4.750 5.0 5.250 V OUT IN Line Regulation 0.2 1.0 % I =10mA, (V +1V)V 16V OUT OUT IN Load Regulation 0.3 1.5 % V = V +1V,10mAI 1A IN OUT OUT - Output Voltage 20 100 ppm/C temperature Coefficient 2 70 200 mV I =100mA Dropout Voltage OUT (except 1.8V version) 280 550 mV I =1A OUT 12 25 mA I =750mA, V = V +1V OUT IN OUT 3 Ground Current 18 mA I =1A OUT I Ground Pin Current at V = 0.1V less than specified V GNDDO IN OUT 1.2 mA Dropout I =10mA, OUT 4 Current Limit 1.5 2.2 A V = 0V OUT 400 V 10Hz-100KHz, I =100mA, C =10F RMS L L Output Noise Voltage 260 V 10Hz-100KHz, I =100mA, C =33F RMS L L Note 2: Dropout voltage is defined as the input to output differential when the output voltage drops to 99% of its normal value. Note 3: 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 4: V =V +1V. For example, use V =4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize IN OUT(NOMINAL) IN temperature rise. 2009 Exar Corporation 2/10 Rev. 2.0.0