SDAA263 June   2026 TPS55289 , TPS55289-Q1 , TPS552892-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1E-latch System Introduction
    1. 1.1 Supercapacitor Characteristic
    2. 1.2 Typical Block Diagram of E-latch System
  5. 2 Supercapacitor Charging with Buck-boost Converter Based on CC/CV Control
    1. 2.1 Advantages of CC/CV Regulators for Supercapacitor Charging
    2. 2.2 Buck-Boost Dual-Loop With CC/CV
    3. 2.3 Output Current Monitoring
  6. 3Design Process
    1. 3.1 TPS5528x Family Part Selection
      1. 3.1.1 Current Capability
      2. 3.1.2 I2C Version and Non-I2C Version
      3. 3.1.3 Part Selection
    2. 3.2 Charge Voltage and Charge Current Setting
  7. 4Experimental Results
  8. 5Summary
  9. 6References

3 Design Process

This chapter introduces how to calculate and select the corresponding Buck-Boost model based on the customer circuit's supercapacitor capacitance, set output voltage, and desired charging time, as well as how to set the charging voltage and charging current.

The typical application circuit for supercapacitor charging based on the TPS5528X is shown in Figure 3-1.

TPS5528X Typical Application Circuit for Supercapacitor ChargingFigure 3-1 TPS5528X Typical Application Circuit for Supercapacitor Charging