SLVSFE7 November   2019 TPS61391

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Circuit
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Recommended Operating Conditions
    2. 6.2 Absolute Maximum Ratings
    3. 6.3 ESD Ratings
    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
      1. 7.3.1 Undervoltage Lockout
      2. 7.3.2 Enable and Disable
      3. 7.3.3 Current Mirror
      4. 7.3.4 High Optical Power Protection
    4. 7.4 Device Functional Mode
      1. 7.4.1 PFM Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirement
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Selecting the Rectifier Diode
        2. 8.2.2.2  Selecting the Inductor
        3. 8.2.2.3  Selecting Output Capacitor
        4. 8.2.2.4  Selecting Filter Resistor and Capacitor
        5. 8.2.2.5  Setting the Output Voltage
        6. 8.2.2.6  Selecting Capacitor for CAP pin
        7. 8.2.2.7  Selecting Capacitor for AVCC pin
        8. 8.2.2.8  Selecting Capacitor for APD pin
        9. 8.2.2.9  Selecting the Resistors of MON1 or MON2
        10. 8.2.2.10 Selecting the Capacitors of MON1 or MON2
        11. 8.2.2.11 Selecting the Short Current Limit
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Package Option Addendum
      1. 12.1.1 Packaging Information
      2. 12.1.2 Tape and Reel Information

Package Options

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

7.4.1 PFM Operation

The TPS61391 integrates a power save mode with pulse frequency modulation (PFM) at the light load. When a light load condition occurs, the COMP pin voltage naturally decreases and reduces the peak current. When the COMP pin voltage further goes down with the load lowered and reaches the pre-set low threshold, the output of the error amplifier is clamped at this threshold and does not go down any more. If the load is further lowered, the device skips the switching cycles and reduces the switching losses and improves efficiency at the light load condition by reducing the average switching frequency.