SLUAAH5 November   2022 BQ25171-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1 Introduction
  4. 2 Li-Ion Overview
  5. 3 Li-Ion Applications
  6. 4 LiFePO4 Overview
  7. 5 LiFePO4 Applications
  8. 6 NiMH Overview
  9. 7 NiMH Applications
  10. 8 Super Capacitors
  11. 9 Super Capacitor Applications
  12. 10Summary
  13. 11References

5 LiFePO4 Applications

Applications require longer life cycle and higher current whereas weight and size are less critical are good applications for LFP.

Higher discharge current capability of the LFP makes them a good fit for portable power tools, motor driven devices and other peak power applications.

Larger multi-cell configuration is equivalent to 12 V lead acid batteries. A 4-cell LFP configuration, 12.8 V is an alternative to a 6-cell lead acid battery, 13.6 V. This makes application in electric vehicles and UPS systems possible.

The BQ25170 can support both LiFePO4 and Li-ion single cell configurations via single resistor programmability option. The BQ25180 and BQ25155 as mentioned earlier are both host-controlled chargers, and battery voltage can be set via MCU to support LiFePO4 battery charging. The BQ25171-Q1 on the other hand can support up to 2 cells of LiFePO4 in series. The BQ25180 and the BQ25155 have shutdown IQ of 10 nA to extend the battery’s shelf life, and the BQ25170 and BQ25171-Q1 has Battery only IQ of 350 nA to extend the operation of the battery and extend the battery’s run time.