link to page 20 link to page 20 link to page 20 link to page 20 link to page 20 link to page 5 link to page 5 link to page 1 Product Sample & Technical Tools & Support & Folder Buy Documents Software Community LM340, LM340A, LM7805, LM7812,LM7815 SNOSBT0L – FEBRUARY 2000 – REVISED SEPTEMBER 2016 LM340, LM340A and LM7805 Family Wide VIN 1.5-A Fixed Voltage Regulators1 Features3 Description • Output Current up to 1.5 A The LM340 and LM7805 Family monolithic 3-terminal 1 positive voltage regulators employ internal current- • Available in Fixed 5-V, 12-V, and 15-V Options limiting, thermal shutdown and safe-area • Output Voltage Tolerances of ±2% at TJ = 25°C compensation, making them essentially indestructible. (LM340A) If adequate heat sinking is provided, they can deliver • Line Regulation of 0.01% / V of at 1-A Load over 1.5-A output current. They are intended as fixed (LM340A) voltage regulators in a wide range of applications including local (on-card) regulation for elimination of • Load Regulation of 0.3% / A (LM340A) noise and distribution problems associated with • Internal Thermal Overload, Short-Circuit and SOA single-point regulation. In addition to use as fixed Protection voltage regulators, these devices can be used with • Available in Space-Saving SOT-223 Package external components to obtain adjustable output voltages and currents. • Output Capacitance Not Required for Stability Considerable effort was expended to make the entire 2 Applications series of regulators easy to use and minimize the number of external components. It is not necessary to • Industrial Power Supplies bypass the output, although this does improve • SMPS Post Regulation transient response. Input bypassing is needed only if • HVAC Systems the regulator is located far from the filter capacitor of the power supply. • AC Inventors • Test and Measurement Equipment LM7805 is also available in a higher accuracy and better performance version (LM340A). Refer to • Brushed and Brushless DC Motor Drivers LM340A specifications in the LM340A Electrical • Solar Energy String Invertors Characterisitcs table. SPACE Device Information(1)Available PackagesPART NUMBERPACKAGEBODY SIZE (NOM) Pin 1. Input DDPAK/TO-263 (3) 10.18 mm × 8.41 mm 2. Ground LM340x SOT-23 (4) 6.50 mm × 3.50 mm 3. Output 2 1 Tab/Case is Ground or Output LM7805 Family TO-220 (3) 14.986 mm × 10.16 mm TO-3 (2) 38.94 mm x 25.40 mm TO-3 TO-220 (1) For all available packages, see the orderable addendum at 1 the end of the data sheet. 2 3 Fixed Output Voltage Regulator TO-263 SOT-223 1 1 2 2 3 3 *Required if the regulator is located far from the power supply filter. **Although no output capacitor is needed for stability, it does help transient response. (If needed, use 0.1-μF, ceramic disc). 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 LM340A Electrical Characteristics, VO = 5 V, VI = 10 V 6.6 LM340 / LM7805 Electrical Characteristics, VO = 5 V, VI = 10 V 6.7 LM340 / LM7812 Electrical Characteristics, VO = 12 V, VI = 19 V 6.8 LM340 / LM7815 Electrical Characteristics, VO = 15 V, VI = 23 V 6.9 Typical Characteristics 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Output Current 7.3.2 Current Limiting Feature 7.3.3 Thermal Shutdown 7.4 Device Functional Modes 8 Application and Implementation 8.1 Application Information 8.1.1 Shorting the Regulator Input 8.1.2 Raising the Output Voltage Above the Input Voltage 8.1.3 Regulator Floating Ground 8.1.4 Transient Voltages 8.2 Typical Applications 8.2.1 Fixed Output Voltage Regulator 8.2.1.1 Design Requirements 8.2.1.2 Detailed Design Procedure 8.2.1.3 Application Curve 8.3 System Examples 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 10.3 Heat Sinking DDPAK/TO-263 and SOT-223 Package Parts 11 Device and Documentation Support 11.1 Documentation Support 11.1.1 Related Documentation 11.2 Related Links 11.3 Receiving Notification of Documentation Updates 11.4 Community Resources 11.5 Trademarks 11.6 Electrostatic Discharge Caution 11.7 Glossary 12 Mechanical, Packaging, and Orderable Information Page 1
