Datasheet LM340, LM340A, LM7805, LM7812, LM7815 (Texas Instruments) - 16

LM340, LM340A , LM7805, LM7812 , LM7815
SNOSBT0L – FEBRUARY 2000 – REVISED SEPTEMBER 2016
www.ti.com System Examples (continued)
Q1 RSC Q1 I 2N6132 Q1 2N6133 IN VI Q2 R1 2N6124 3.0: IREG IO MAX OUTPUT VO INPUT INPUT OUT OUTPUT 0.1 PF 0.22 PF R1 GND 3.0: 0.22 PF 0.1 PF GND β(Q1) ≥ IO Max / IREG Max RSC = 0.8 / ISC R1 = 0.9 / IREG = β(Q1) VBE(Q1) / IREG Max (β +1) – IO Max R1 = βVBE(Q1) / IREG Max (β +1) – IO Max
Figure 24. High Current Voltage Regulator Figure 25. High Output Current With Short-Circuit Protection
INPUT OUTPUT LM340 + OUT + + 0.1 PF GND INPUT OUTPUT LM79xx + + 0.1 PF GND - OUT
Figure 26. LM340 Used With Negative Regulator LM79xx
16 Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated Product Folder Links: LM340 LM340A LM7805 LM7812 LM7815 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