SLYY195A August   2020  – May 2022 BQ25790 , BQ25792 , BQ25798

 

  1.   At a glance
  2.   Authors
  3.   3
  4.   Why universal charging
  5.   On-the-go charging
  6.   Integrated components maximize power density
  7.   Implementing buck-boost charging
  8.   Conclusion
  9.   References

Implementing buck-boost charging

All of the features described so far, which help simplify the system-level design of a USB PD charging solution, have been implemented in TI’s BQ25790 and BQ25798 buck-boost chargers. These devices support one cell in series (1s) to 4s battery charging from a 3.6-V to 24-V input voltage, which covers the full USB PD input voltage range.

The BQ25790 and BQ25798 include:

  • A dual-input power multiplexer for input source power-path management and selection.
  • USB battery charging 1.2 and high-voltage dedicated charging port adapter detection.
  • Input current-sensing, regulation and protection circuits.
  • Four switching MOSFETs for the buck-boost converter.
  • One battery MOSFET for NVDC power-path management and charging the current sensor.
  • A 16-bit analog-to-digital converter for monitoring and optimizing system performance.
  • USB Type-C OTG and FRS operations.

These features are available in a 2.9-mm-by-3.3- mm wafer chip-scale package or a 4-mm-by-4- mm quad flat no-lead package. The total charging solution is capable of delivering 45 W of power, with around 100 W/in2(150mV/mm2) of power density, which is two times more than competitive devices.