SNOSA40K November   2002  – December 2016 LP2996-N , LP2996A

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 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Start-Up
      2. 7.4.2 Normal Operation
      3. 7.4.3 Shutdown
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Typical SSTL-2 Application Circuit
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Input Capacitor
          2. 8.2.1.2.2 Output Capacitor
            1. 8.2.1.2.2.1 Aluminum Electrolytics
            2. 8.2.1.2.2.2 Ceramic Capacitors
            3. 8.2.1.2.2.3 Hybrid Capacitors
            4. 8.2.1.2.2.4 PC Application Considerations
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Other Application Circuits
        1. 8.2.2.1 SSTL-2 Applications
        2. 8.2.2.2 DDR-II Applications
        3. 8.2.2.3 DDR-III Applications
      3. 8.2.3 Level Shifting
      4. 8.2.4 HSTL Applications
      5. 8.2.5 QDR Applications
  9. 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 Related Links
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

9 Power Supply Recommendations

There are several recommendations for the LP2996-N and LP2996A input power supply. Although not required, TI recommends an input capacitor for improved performance during large load transients to prevent the input rail from dropping. The input capacitor must be placed as close as possible to the PVIN pin.

A typical value recommended for aluminum electrolytic capacitors is 50 µF. Ceramic capacitors can also be used, a value approximately 10 µF with X5R or better would be an ideal choice. The input capacitance can be reduced if the LP2996-N or LP2996A is placed close to the bulk capacitance from the output of the 2.5-V DC-DC converter. If the two supply rails (AVIN and PVIN) are separated then the 47-µF capacitor must be placed as close to possible to the PVIN rail. An additional 0.1-µF ceramic capacitor can be placed on the AVIN rail to prevent excessive noise from coupling into the device.