SNOS733R April   2000  – February 2025 LP2980-N

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Output Enable
      2. 6.3.2 Dropout Voltage
      3. 6.3.3 Current Limit
      4. 6.3.4 Undervoltage Lockout (UVLO)
      5. 6.3.5 Output Pulldown
      6. 6.3.6 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation
      2. 6.4.2 Dropout Operation
      3. 6.4.3 Disabled
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Recommended Capacitor Types
        1. 7.1.1.1 Recommended Output Capacitors (Legacy Chip)
          1. 7.1.1.1.1 Tantalum Capacitors (Legacy Chip)
          2. 7.1.1.1.2 Aluminum Electrolytic Capacitors (Legacy Chip)
          3. 7.1.1.1.3 Multilayer Ceramic Capacitors (Legacy Chip)
        2. 7.1.1.2 Recommended Output Capacitors (New Chip)
      2. 7.1.2 Input Capacitor Requirements
      3. 7.1.3 Estimating Junction Temperature
      4. 7.1.4 Power Dissipation (PD)
      5. 7.1.5 Reverse Current
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 ON/OFF Input Operation
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 Device Nomenclature
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.1.1.1 Recommended Output Capacitors (Legacy Chip)

The legacy chip version of the LP2980-N requires an output capacitor to maintain regulator loop stability. Select this capacitor to meet the requirements of minimum capacitance and equivalent series resistance (ESR) range. Because the acceptable capacitance and ESR ranges are wider than for most other LDOs, finding capacitors that meet the stability criteria of the LP2980-N is not difficult. Dynamic device performance also improves by using an output capacitor.

In general, make sure the capacitor value is at least 1μF (over the actual ambient operating temperature), and the ESR is within the range indicated in Figure 5-41, Figure 5-42, and Figure 5-43. Although a maximum ESR is given in these figures, capacitors generally do not support such high ESR values.