SBVS375D July   2019  – July 2026 TPS7A03

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 Switching Characteristics
    7. 5.7 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 Excellent Transient Response
      2. 6.3.2 Active Discharge (P-Version Only)
      3. 6.3.3 Low IQ in Dropout
      4. 6.3.4 Smart Enable
      5. 6.3.5 Dropout Voltage
      6. 6.3.6 Foldback Current Limit
      7. 6.3.7 Undervoltage Lockout (UVLO)
      8. 6.3.8 Thermal Shutdown
    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 Recommended Capacitor Types
      2. 7.1.2 Input and Output Capacitor Requirements
      3. 7.1.3 Load Transient Response
      4. 7.1.4 Undervoltage Lockout (UVLO) Operation
      5. 7.1.5 Power Dissipation (PD)
        1. 7.1.5.1 Estimating Junction Temperature
        2. 7.1.5.2 Recommended Area for Continuous Operation
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Examples
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 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

7.2.2 Detailed Design Procedure

For this design example, the 1.0V, fixed-version TPS7A0310 is selected. A dual AA Alkaline battery was used, thus a 1.0µF input capacitor is recommended to minimize transient currents drawn from the battery. Use a 1.0µF output capacitor for excellent load transient response. Keep the dropout voltage (VDO) within the TPS7A03 dropout voltage specification for the 1.0V output voltage option. This voltage level keeps the device in regulation under all load and temperature conditions for this design. Use the recommend 1µF input and output capacitor because the input source has a high equivalent series resistor (ESR) of 600mΩ (typ). The very small ground current consumed by the regulator maintains a high current efficiency as compared to the load current consumed by the system. This efficiency is depicted in Figure 7-5, which allows for long battery life. Equation 6 calculates the current efficiency (Iη) of this system.

Equation 6. Iη(%) = IOUT / (IOUT + IQ) × 100