• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 159 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25120A: Efficiency of buck converter

krf
Prodigy 70 points
Part Number: BQ25120A

Hi,

I am going to use buck converter with voltages that 1.2V to 1.8V. Drawing current is probably maximum 6-7mA.

What should do ı to keeping efficiency above %85? or it is possible to do that? Maybe selecting right inductor would help us but ı am not sure calculations that specified in datasheet.

What should be DCR value of inductor?

Best Regards... 

  • 0
    TI__Genius 17955 points

    Hi,

    krf said:
    voltages that 1.2V to 1.8V

    To clarify this is your output voltage range?

    krf said:
    keeping efficiency above %85? or it is possible to do that?

    Efficiency is highest when the output voltage is closer to the input voltage of the buck converter, so you will see higher efficiency by keeping your buck output voltage as high as possible. Efficiency will vary as the battery charges and discharges, becoming more efficient as it discharges (since the voltage drop will be less). Section 10.2.3.2 of the datasheet shows the efficiency curves of the SYS rail across various load currents, input voltages, and output voltages.

    In terms of selecting an inductor, a lower DCR is typically desirable for higher efficiency, but maintaining a 2.2uH inductor value is important as the device has been characterized with this inductance and may not work as expected with a different value. 

    Best Regards,

    Juan Ospina