SNVS192C October   2002  – November 2015 LP3992

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 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Input Test Signals
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Shutdown and Enable
      2. 8.3.2 Fast Turnon and Turnoff
    4. 8.4 Device Functional Modes
      1. 8.4.1 Enable Operation
  9. 9 Application And Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 External Capacitors
        2. 9.2.2.2 Input Capacitor
        3. 9.2.2.3 Output Capacitor
        4. 9.2.2.4 No-Load Stability
        5. 9.2.2.5 Capacitor Characteristics
        6. 9.2.2.6 Power Dissipation
        7. 9.2.2.7 Estimating Junction Temperature
      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 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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11 Layout

11.1 Layout Guidelines

The dynamic performance of the LP3992 is dependant on the layout of the PCB. PCB layout practices that are adequate for typical LDOs may degrade the PSRR, noise, or transient performance of the device.

Best performance is achieved by placing CIN and COUT on the same side of the PCB as the LP3992 and as close as is practical to the package. The ground connections for CIN and COUT must be routed back to the LP3992 GND pin using as wide and as short a copper trace as is practical.

Avoid layout connections that have any combination of long trace length, narrow trace width, or vias. These add parasitic inductances and resistance that result in inferior performance, especially during transient conditions.

11.2 Layout Example

LP3992 layout_snvs192.gif Figure 18. LP3992 Layout Example