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TLV62065 Efficiency

Blyker
Prodigy 50 points
Other Parts Discussed in Thread: TLV62065, TPS62085, TPS62740, TPS82084

Hi,

What is the efficiency  of the TLV62065 at 10uA or less? I am looking for a Buck Converter with 2A output and high efficiency at light loads.

Thanks for your answers.

Best regards.

  • 0
    TI__Guru**** 150950 points
    What is your Vin range and Vout needed?

    You could measure it on an EVM, but the input current will be at least the Iq, so you can compute a maximum theoretical efficiency from this.

    But the combining of ultra-low current efficiency and higher current loads is odd. Could you share a little more about your application requirements?

    Finally, the TPS62085 is a newer device which has better efficiency at heavier loads, which is likely important to you as well.
  • 0 in reply to Chris Glaser
    Prodigy 50 points

    Vin range is from 3.3V to 5.0V and Vout 3.3V. My application consist of a microcontroller that sends information periodically through a XBee, and spend most of the time sleeping. I need a ultra low current efficiency for the sleeping time, and enough current for transmitting (1.5A at least). I have been read datasheets of several Buck Converter, and found that the efficiency is around 70% for 100uA.

  • 0 in reply to Blyker
    TI__Guru**** 150950 points
    2A sounds like a lot of power for a radio.

    The efficiency at loads under 10 uA is very dependent on the Iq. Here is a paper on Iq: www.ti.com/.../slyt412.pdf

    If you are most concerned about battery life, you could use a TPS62740/3 type device to power just the MCU. Now, you get ~90% efficiency down to 10uA loads due to the ultra-low 360 nA Iq. You then have a separate converter for the XBee. I recommend a device with DCS-Control to power such a load with fast and large transients. TPS82084/5 module or TPS62085 discrete are good ones for this.

    What source do you have that varies from 3.3V to 5V?
  • 0 in reply to Chris Glaser
    Prodigy 50 points
    Yes, 2A is too much for a radio, but I'm thinking a converter for incoming projects. I have a battery charger, and his output depend if an AC/DC converter is connected or not (3.3V is the minimum from the battery and 5.0V is from the AC/DC converter).

    Thanks for your answers.

    Best regards.