• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 462 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.

TPS54260: Light load efficiency issue

Ryder Nguyen
Prodigy 110 points
Part Number: TPS54260
Other Parts Discussed in Thread: TPS54360, LMR36015, LMR33630, LMR33620, LMR36006

Hi guys
I am designing the power supply for a tracking device, which uses a GPRS and GPS module (MC60 from Quectel)

I am using TPS54360 with 74404043100A  inductor from Wurth 

Our device is almost in sleep mode, which just consumes about 600uA but the efficiency of TPS54360 is to low (about 10%) at 12V input

I have checked the datasheet, there is no data about the efficiency at 0.6mA output current. Can you help me to find out the efficiency data at 0.6mA output current?

BTW, how to force TPS54360 to run in ECO mode?

Thanks

Ryder

  • 0
    TI__Guru 74052 points

    Hi Ryder,

    The TPS54360 should be in pulse skipping ECO mode at the 0.6mA light-load condition. You can check the SW node voltage waveform to verify that.

    Note the inductor you mentioned only has a sat current of 1.04A, well below the current limit threshold of the TPS54360. If you don't need the full load current capability of the TPS54360, you might also consider the LMR36006 or LMR36015 synchronous buck converters -- these also have high light-load efficiency. Also, given that VIN = 12V here, maybe you don't need 60V input capability -- in that case, refer to the LMR33620 and LMR33630 as alternatives.

    Regards,

    Tim