SLVSI89A March   2026  – June 2026 TPS63820

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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 Timing Requirements
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Control Scheme
        1. 7.3.1.1 Buck Operation
        2. 7.3.1.2 Boost Operation
        3. 7.3.1.3 Buck-Boost Operation
      2. 7.3.2  PFM Operation
      3. 7.3.3  Ultra-sonic Mode Operation
      4. 7.3.4  Forced-PWM Operation (FPWM)
      5. 7.3.5  Ramp-PWM Operation (RPWM)
      6. 7.3.6  Device Enable (EN)
      7. 7.3.7  Undervoltage Lockout (UVLO)
      8. 7.3.8  Soft Start
      9. 7.3.9  Dynamic Voltage Scaling
      10. 7.3.10 Protection Functions
        1. 7.3.10.1 Input Voltage Protection (IVP)
        2. 7.3.10.2 Output Voltage Protection (OVP)
        3. 7.3.10.3 Current Limit Mode and Overcurrent Protection
        4. 7.3.10.4 Output Short-Circuit Protection (Hiccup)
        5. 7.3.10.5 Thermal Shutdown
      11. 7.3.11 Power Good
      12. 7.3.12 Load Disconnect
      13. 7.3.13 Output Discharge
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
      1. 7.5.1 Serial Interface Description
      2. 7.5.2 Standard-, Fast-, and Fast-Mode Plus Protocol
      3. 7.5.3 I2C Update Sequence
  9. 8 Register Map
    1. 8.1 Register Description
      1. 8.1.1 Register Map
      2. 8.1.2 Register CONTROL (Register address: 0x01; Default: 0xE0 or 0x40)
      3. 8.1.3 Register STATUS (Register address: 0x02; Default: 0x00)
      4. 8.1.4 Register DEVID (Register address: 0x03; Default: 0x20)
      5. 8.1.5 Register VOUT1 (Register address: 0x04; Default: 0x54)
      6. 8.1.6 Register CONTROL2 (Register address: 0x06; Default: 0x08)
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 1.2V to 5.5V Output Power Supply
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection
          2. 9.2.1.2.2 Output Capacitor Selection
          3. 9.2.1.2.3 Input Capacitor Selection
        3. 9.2.1.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1.     79

7.3.2 PFM Operation

To increase efficiency across a wide range of operating conditions, the device automatically changes from pulse-width modulation (PWM) at medium and high output currents to pulse-frequency modulation (PFM) at low output currents.

  • During PWM operation, the device switches continuously and adjusts the duty cycle of each switching cycle to regulate the output voltage.
  • During PFM operation, the device switches with a single pulse, separated by periods when the device does not switch. PFM operation increases efficiency at low output currents because when the device does not switch, there are no switching losses and most of the internal circuitry is disabled, which reduces quiescent power consumption. A comparator compares the output voltage of the error amplifier to a predefined PFM threshold voltage.

To enable power-save mode, clear the FPWM bit in the Control register to 0.

Table 7-1 Forced-PWM versus Power-Save Mode Performance Comparison
PERFORMANCE PARAMETERBEST OPERATING MODE
Low-power efficiencyPFM
Medium- and high-power efficiencyNo difference
DC Output voltage accuracyForced-PWM
Transient responseForced-PWM
Output voltage rippleForced-PWM