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

4 Experimental Results

This chapter presents the charging waveforms of the TPS55289(2)-Q1 for supercapacitor applications. Additionally, it highlights the operational differences between the non-I2C version entering hiccup mode and the I2C version with hiccup mode disabled.

TPS552892: Vin = 9V, V_charge = 12V, I_charge = 2.5A, Super cap = 5.4FFigure 4-1 TPS552892: Vin = 9V, V_charge = 12V, I_charge = 2.5A, Super cap = 5.4F

Figure 4-1 illustrates the supercapacitor charging waveforms of the TPS552892-Q1 configured for a 2.5A output current. Because the current limit is set to a low value, the device avoids entering hiccup mode during the initial phase of charging.

TPS552892: Vin = 9V, V_charge = 12V, I_charge = 5A, Super cap = 5.4FFigure 4-2 TPS552892: Vin = 9V, V_charge = 12V, I_charge = 5A, Super cap = 5.4F

When the output current is set to 5A, hiccup mode is triggered during the initial charging stage as Figure 4-2 shows. Once the capacitor voltage is charged above 0.8V, TPS552892-Q1 exits hiccup mode and proceeds with CCCV charging.

TPS55289: Vin = 9V, V_charge = 12V, I_charge = 5A, Super cap = 5.4FFigure 4-3 TPS55289: Vin = 9V, V_charge = 12V, I_charge = 5A, Super cap = 5.4F

After deactivating hiccup mode through the I2C interface, TPS55289-Q1 immediately begins 5-A constant-current charging once the device is enabled as Figure 4-3.