SLUUCX1 august   2023 BQ25173-Q1

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 I/O Descriptions
    2. 2.2 Printed Circuit Board Assembly
    3. 2.3 Best Practices
      1.      15
    4. 2.4 Test Summary
      1. 2.4.1 Equipment
      2. 2.4.2 Cautions
      3. 2.4.3 Test Instructions
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 Board Layout
    3. 3.3 Bill of Materials
  9. 4Additional Information
    1.     Trademarks

2.4.2 Cautions

Care must be taken to not charge the super capacitor higher than the voltage rating specified by the manufacturer. For setting the max charging voltage, refer to the Super capacitor Regulation Voltage section of the BQ25173-Q1 800-mA Linear Charger for 1- to 4-Cell Super capacitor data sheet (SLUSF68).

The BQ25173-Q1EVM has two series super capacitors installed on the board, C7 & C8. The super capacitors support VREG up to 5 V. The regulation voltage is set by JP7 to 2.5V or 5 V. For higher voltage C7 & C8 must be disconnected using JP6 and external super capacitors or test equipment used. Higher voltage, 7.5V or 10 V can be set installing R18 or R17.

The device enters thermal regulation at too high an input to output voltage drop and current. Thermal regulation begins reducing current at 125 °C; at 150 °C device shuts off. For thermal calculation, refer to the Thermal Package section of the BQ25173-Q1 800-mA Linear Charger for 1- to 4-Cell Super capacitor data sheet (SLUSF68).

The device can get hot during high input-to-output voltage drop and high current conditions. Use caution when handling the board.