SNOSC48O June   2000  – December 2014 LM2936

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics for 3-V LM2936
    6. 6.6 Electrical Characteristics for 3.3-V LM2936
    7. 6.7 Electrical Characteristics for 5-V LM2936
    8. 6.8 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 High Input Operating Voltage
      2. 7.3.2 Thermal Shutdown (TSD)
      3. 7.3.3 Short-Circuit Current Limit
      4. 7.3.4 Shutdown (SD) Pin
    4. 7.4 Device Functional Modes
  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
          1. 8.2.2.1.1 Minimum Capacitance
          2. 8.2.2.1.2 ESR Limits
        2. 8.2.2.2 Output Capacitor ESR
      3. 8.2.3 Application Curve
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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9 Power Supply Recommendations

This device is designed to operate from an input supply voltage from at least VOUT + 1 V up to a maximum of 40 V. The input supply should be well regulated and free of spurious noise. To ensure that the LM2936 output voltage is well regulated the input supply should be at least VOUT + 2 V. A capacitor at the IN pin may not be specifically required if the bulk input supply filter capacitors are within three inches of the IN pin, but adding one will not be detrimental to operation.

While the LM2936 maintains regulation to VIN = 60 V, it will not withstand a short circuit on the output with VIN above 40 V because of safe operating area limitations in the internal PNP pass device. With VIN above 60 V the LM2936 will break down with catastrophic effects on the regulator and possibly the load as well. Do not use this device in a design where the input operating voltage, including transients, is likely to exceed 60 V.