SLUAAJ6 april   2023 BQ25171-Q1 , BQ51013B-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Wireless Power Design
    1. 1.1 Wireless Charging Input
    2. 1.2 Battery Charger
  4. 2Layout Guidelines
    1. 2.1 Wireless Receiver (BQ51013B-Q1)
    2. 2.2 Linear Charger (BQ25171-Q1)
  5. 3Experimental Results
    1. 3.1 Wireless Power Efficiency
    2. 3.2 FOD Calibration
    3. 3.3 Battery Charge Profile
  6. 4References

1.2 Battery Charger

The BQ25171-Q1 is an AEC-Q100 qualified linear charger that is capable of 800 mA and suitable for 1-2 cell Li-Ion, Li-Polymer, LiFePO4, as well as 1-6 cell NiMH. The charger operates as a standalone device where charge parameters such as charge current, battery chemistry, and regulation voltage are selected based by the resistor for each function. The input operating range of 3 V to 18 V and absolute maximum 40 V makes BQ25171-Q1 designed for automotive applications where a wide range of supply voltages can be used.

Figure 1-3 shows the charger portion of the design where the input is powered by the output of the BQ51013B-Q1. With 82-kΩ, 18-kΩ, and a potentiometer at the CHM_TMR, VSET, and ISET pins, the device is configured for charging 4.2 V Li-Ion batteries with a variable charge current. This configuration is done to meet the requirements in Table 1-3.

GUID-20221222-SS0I-3XPJ-9JWT-DZBM8ZKV5Z5C-low.gif Figure 1-3 Battery Charger Schematic: BQ25171-Q1
Table 1-3 BQ25171-Q1 Design Requirements
DescriptionValue
Battery ChemistryLi-Ion
Battery Regulation Voltage4.2 V
Safety Charge Timer10 hours