SNVS100F March   2000  – July 2014 LM2937

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  Handling Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics: LM2937-5
    6. 6.6  Electrical Characteristics: LM2937-8
    7. 6.7  Electrical Characteristics: LM2937-10
    8. 6.8  Electrical Characteristics: LM2937-12
    9. 6.9  Electrical Characteristics: LM2937-15
    10. 6.10 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Thermal Shutdown (TSD)
      2. 7.3.2 Short Circuit Current Limit
      3. 7.3.3 Overvoltage Shutdown (OVSD)
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 External Capacitors
        2. 8.2.2.2 Output Capacitor ESR
        3. 8.2.2.3 Heatsinking
        4. 8.2.2.4 Heatsinking TO-220 Package Parts
        5. 8.2.2.5 Heatsinking DDPAK/TO-263 and SOT-223 Package Parts
        6. 8.2.2.6 SOT-223 Soldering Recommendations
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Fully Specified for Operation Over −40°C to 125°C
  • Output Current in Excess of 500 mA
  • Output Trimmed for 5% Tolerance Under all Operating Conditions
  • Typical Dropout Voltage of 0.5 V at Full Rated Load Current
  • Wide Output Capacitor ESR Range, up to 3 Ω
  • Internal Short Circuit and Thermal Overload Protection
  • Reverse Battery Protection
  • 60-V Input Transient Protection
  • Mirror Image Insertion Protection

2 Applications

  • Automotive
  • Industrial Control
  • Point-of-Load regulation

Simplified Schematic

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3 Description

The LM2937 is a positive voltage regulator capable of supplying up to 500 mA of load current. The use of a PNP power transistor provides a low dropout voltage characteristic. With a load current of 500 mA the minimum input to output voltage differential required for the output to remain in regulation is typically 0.5 V (1-V ensured maximum over the full operating temperature range). Special circuitry has been incorporated to minimize the quiescent current to typically only 10 mA with a full 500-mA load current when the input to output voltage differential is greater than 3 V.

The LM2937 requires an output bypass capacitor for stability. As with most low dropout regulators, the ESR of this capacitor remains a critical design parameter, but the LM2937 includes special compensation circuitry that relaxes ESR requirements. The device is stable for all ESR below 3 Ω. This allows the use of low ESR chip capacitors.

Ideally suited for automotive applications, the LM2937 will protect itself and any load circuitry from reverse battery connections, two-battery jumps, and up to 60-V/−50-V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM2937 TO-220 (3) 14.986 mm x 10.66 mm
SOT (4) 6.50 mm x 3.5 mm
TO-263 (3) 10.18 mm x 8.41 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.