SLUAAM6 November   2022 BQ24190 , BQ24192 , BQ24192I , BQ24195 , BQ24195L , BQ24196 , BQ24292I , BQ24295 , BQ24296 , BQ24297 , BQ24298 , BQ25600 , BQ25600D , BQ25601 , BQ25601D , BQ25606 , BQ25611D , BQ25616 , BQ25618 , BQ25619 , BQ25620 , BQ25622 , BQ25890 , BQ25890H , BQ25892 , BQ25895 , BQ25896 , BQ25898 , BQ25898D

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Input Current Limit Detection
    2. 1.2 Control Methodology Host Controlled vs Stand-Alone
    3. 1.3 Battery Monitoring and Protection
    4. 1.4 Boost Mode On-The-Go (OTG) Output
  4. 2Stand-Alone Single-Cell Switching Battery Chargers
  5. 3I2C-Controlled 3.9 V – 14 V Single-Cell Switching Battery Chargers With Battery Monitoring (BQ2589x and BQ25898x)
  6. 4I2C-Controlled 3.9 V – 17 V VBUS Single-Cell Switching Battery Chargers (BQ2419x)
  7. 5I2C-Controlled 3.9 V – 6.2 V VBUS Single-Cell Switching Battery Chargers (BQ2429x)
  8. 6I2C-Controlled 3.9 V – 13.5 V VBUS Single-Cell Switching Battery Chargers (BQ2560x and BQ2561x)
  9. 7I2C-Controlled 3.9 V – 18 V VBUS Single-Cell Switching Battery Chargers (BQ2562x)
  10. 8Summary
  11. 9References

1.2 Control Methodology Host Controlled vs Stand-Alone

As a battery charger designer, one of the most important questions to consider is the control method for the charging system. Shall a microprocessor-controlled charger or a stand-alone charger be used?

The two most popular control methodologies are:

  • Inter-Integrated Circuit (I2C) controlled: The I2C bus is a very popular and powerful bus used for communication between a host device (or multiple host devices) and a single auxiliary device (or multiple auxiliary devices). A microcontroller, known as the host device, is necessary to communicate with auxiliary devices, including the charger. It’s possible for the host device to modify tens of charger system parameters via I2C on the fly. Charger status as well as fault conditions can be reported back to the host device.
  • Stand-alone: The charger functions independently without any software or host control. Fixed resistors on the board determine adjustable settings like charge current and voltage limit.

Table 1-1 lists what can be considered when determining the control method for a charger system.

Table 1-1 I2C Control vs. Stand-Alone
I2C-controlled Stand-alone
Need real-time control over the charger? √ X
Need the flexibility of charging parameters? √ X
Need to monitor charging parameter values? √ X
Require a host? Yes No
Require software code? Yes No