TIDT184 December   2021

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Test Setup
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Start-Up Sequence

Description

This reference design is for 4-cell battery charging applications, such as a vacuum robot or robotic lawn mower, and so forth. The design employs the BQ25672 buck battery charger with a wide input and output range for 1- to 4-cell battery charging. An external ship FET is introduced to minimize the battery leakage current by totally disconnecting all system load from batteries when in standby. This reference design uses two-layer board to optimize cost and achieve 35-mm × 35-mm board dimensions.