SLVSCZ5B July   2016  – October 2018 TPS61230A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
      2.      Efficiency
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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
      1. 7.3.1 Startup
      2. 7.3.2 Enable and Disable
      3. 7.3.3 Under-Voltage Lockout (UVLO)
      4. 7.3.4 Current Limit Operation
      5. 7.3.5 Over Voltage Protection
      6. 7.3.6 Load Disconnect
      7. 7.3.7 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 PWM Mode
      2. 7.4.2 PFM Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 TPS61230A 2.5-V to 4.5-V Input, 5-V Output Converter
        1. 8.2.1.1 TPS61230A 5-V Output Design Requirements
        2. 8.2.1.2 TPS61230A 5-V Detailed Design Procedure
          1. 8.2.1.2.1 Programming The Output Voltage
          2. 8.2.1.2.2 Inductor and Capacitor Selection
            1. 8.2.1.2.2.1 Inductor Selection
            2. 8.2.1.2.2.2 Output Capacitor Selection
            3. 8.2.1.2.2.3 Input Capacitor Selection
          3. 8.2.1.2.3 Loop Stability, Feed Forward Capacitor
        3. 8.2.1.3 TPS61230A 5-V Output Application Performance Plots
      2. 8.2.2 Systems Example - TPS61230A with Feed Forward Capacitor for Best Transient Response
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    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

8.2.1.2.1 Programming The Output Voltage

The TPS61230A's output voltage need to be programmed via an external voltage divider to set the desired output voltage.

An external resistor divider is used, as shown in Equation 4. By selecting R1 and R2, the output voltage is programmed to the desired value. When the output voltage is regulated, the typical voltage at the FB pin is VFB. The following equation can be used to calculate R1 and R2.

Equation 4. TPS61230A EQ1_output_SLVSCZ5.gif

R2 is typically around 100kΩ to ensure that the current following through R2 is at least 100 times larger than FB pin leakage current. Changing R2 towards a lower value increases the robustness against noise injection. Changing the R2 towards higher values reduces the quiescent current for achieving highest efficiency at low load currents.

For the fixed output voltage version, the FB pin must be tied to the output directly.