SLVS047L November   1981  – January 2015 LM237 , LM337

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Electrical Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Design Schematic
    4. 8.4 Feature Description
      1. 8.4.1 Output Voltage Adjustment
    5. 8.5 Device Functional Modes
      1. 8.5.1 Adjustable Output Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 General Configurations
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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8 Detailed Description

8.1 Overview

The LMx37 devices are adjustable 3-terminal negative-voltage regulators capable of supplying in excess of –1.5 A over an output voltage range of –1.2 V to –37 V. They are exceptionally easy to use, requiring only two external resistors to set the output voltage and one output capacitor for frequency compensation. The current design is optimized for excellent regulation and low thermal transients. In addition, LM237 and LM337 feature internal current limiting, thermal shutdown, and safe-area compensation, making them virtually immune to failure by overloads. The LMx37 devices serve a wide variety of applications, including local on-card regulation, programmable output-voltage regulation, and precision current regulation.

8.2 Functional Block Diagram

lmx37_blockdia.gif

8.3 Design Schematic

sch_dia_lvs047.gif

8.4 Feature Description

8.4.1 Output Voltage Adjustment

The ADJUSTMENT pin serves as a voltage adjustment reference for the output. The ADJUSTMENT pin can be attached to a resistor divider circuit to adjust its own voltage level. The reference voltage VADJUSTMENT will typically be 1.25 V higher than VO.

8.5 Device Functional Modes

8.5.1 Adjustable Output Mode

The device has a single functional mode: Adjustable output voltage mode. A resistor divider circuit on the ADJUSTMENT pin determines the output voltage.