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TPS60204: average current 30mA but (very small) peaks of 180mA

Frits Jan van Kempen
Prodigy 215 points
Part Number: TPS60204
Other Parts Discussed in Thread: TPS61091, TPS60120

Tha tps60204 datasheet states it can deliver (min) 100mA continuously.

I want to power a esp32C3 microcontroller (in low power mode).

However, during bluetooth transmissions it will draw tiny peaks (say 2ms each 250ms) of max 180mA.

I have measured the device with a power profiler, and the peaks are tiny, minimum power draw is about 16mA, max 180mA and average is 25mA.

There are no big timespans where the power is above 100mA (even above 50mA).

Can I then use this device? Or should I switch to TPS61091 for example.
This seems a bit of an overkill for my application...

My device is battery powered 2x AAA alkaline.

I like to use the low-battery warning on the TPS60204.

Any other recommendations?

Thanks in advance

  • 0
    TI__Guru 65170 points

    Hello Frits Jan,

    In general, I do not expect an issue when using TPS60204 for this application. It might be necessary to increase the output capacitor, if the ripple gets too high. The current peaks will be delivered by the output capacitor as long as there are times in between when the charge pump has time to recharge it.

    Best regards,
    Brigitte

  • 0
    Prodigy 215 points

    Thank you for the reply. How high should the output capacitor then be? (Can I go too high?)

    also i found the tps60120 which has an output of 200mA,

    I could use this one instead, but it feels like an overkill to me.

    also the tps60120 has a strange efficiency curve compared to the tps60204. And there is the bigger footprint…

  • 0 in reply to Frits Jan van Kempen
    TI__Guru 65170 points

    Hello Frits,

    For the first test, I would not increase the output capacitor. Only if the cap is discharged too much during the peak currents, I would increase it. In general there is almost no limit as long as there is enough time to recharge it.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Prodigy 215 points

    After some tesing, I concluded that the tps60204 could not deliver enough power for the startup of the esp32-C3. So I went by using the TPS60120.