SLVS181K December   1998  – December 2025 TPS763

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 Diagrams
    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 Thermal Shutdown
      5. 6.3.5 Output Pulldown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Device Functional Mode Comparison
      2. 6.4.2 Normal Operation
      3. 6.4.3 Dropout Operation
      4. 6.4.4 Disabled
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Adjustable Device Feedback Resistors
      2. 7.1.2 Capacitor Selection (Legacy Chip)
      3. 7.1.3 Recommended Capacitor Types (New Chip)
      4. 7.1.4 Input and Output Capacitor Requirements (New Chip)
      5. 7.1.5 Reverse Current
      6. 7.1.6 Feed-Forward Capacitor (CFF)
      7. 7.1.7 Power Dissipation (PD)
      8. 7.1.8 Estimating Junction Temperature
      9. 7.1.9 Special Consideration for Line Transients (New Chip)
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Transient Response
        2. 7.2.2.2 Selecting Feedback Divider Resistors
        3. 7.2.2.3 Thermal Dissipation
      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 Device Nomenclature
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.2.2.2 Selecting Feedback Divider Resistors

The output voltage of the TPS76301 adjustable regulator is programmed using an external resistor divider as illustrated in Figure 7-5. The output voltage is calculated using Equation 7.

Equation 7. TPS763

where:

  • Vref = 1.192V typical (the internal reference voltage)
  • 0.995 is a constant used to center the load regulator (1%)

Resistors R1 and R2 must be chosen for approximately 7-µA divider current. Lower value resistors can be used but offer no inherent advantage and waste more power. Higher values must be avoided as leakage currents at FB increase the output voltage error. TI recommends choosing a design procedure of R2 = 169kΩ to set the divider current at 7 µA and then calculate R1 using Equation 8.

Equation 8. TPS763
TPS763 TPS76301 Adjustable LDO Regulator ProgrammingFigure 7-5 TPS76301 Adjustable LDO Regulator Programming