SLVAG21 April   2026 TPS61381-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2System Overview
    1.     6
    2. 2.1 Design Considerations
    3. 2.2 System Design Theory
      1. 2.2.1 Supercapacitor Charging Operation
        1. 2.2.1.1 Calculation for Backup Supercapacitor Selection
          1. 2.2.1.1.1 Design Calculations
  6. 3Test Results
    1. 3.1 Standby Operation
    2. 3.2 Charging Operation
    3. 3.3 Boost Operation
  7. 4Summary
  8. 5References

TPS61381-Q1 Functional Block Diagram Figure 2-1 TPS61381-Q1 Functional Block Diagram

The TPS61381-Q1 integrates a configurable constant-current and constant-voltage (CC/CV) with programmable timer to charge the battery, which can support one to five cell NiMH, one to two cell Li-Ion, Li-Poly, and LiFePO4, one to four cell supercap. Figure 2-1 shows the corresponding functional block diagram.

The device has a battery temperature monitor feature and controls the back-up battery discharge current by an I2C interface and an output analog signal for MCU for diagnosing the battery health. This is available in a 3mm × 4mm QFN package with wettable flank.