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REG71050: REG71050 VS TPS60150 heat dissipation

Kostas Papouis
Prodigy 70 points
Part Number: REG71050
Other Parts Discussed in Thread: TPS60150,

Hi TI Team,

I am looking to boost a 3V3 rail to 5V in order to power a load of max 30mA. The PCB will be fitted into an enclosure with temperature sensor.

 I would like to ask which solution out of the following two will create the least heat dissipation which will have a result of a less heat rise building inside the enclosure.

 REG71050 or TPS60150.

 Thank you.

  • 0
    TI__Guru 61705 points

    Hello Kostas,

    Both are charge pumps. For getting from 3.3V to 5V, a charge pump operates in voltage doubler mode. So at the end, the power dissipation in this operating mode is calculated like this and it is the same for both devices:

    ( 2 * 3.3V - 5V) * 30 mA = 48 mW

    So if you want to minimize power dissipation, you either need to use a free running voltage doubler, which then generates a voltage which is above 6V with 3.3V input or you go with a inductive boost converter optimized for low currents.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Prodigy 70 points

    Hi Brigitte,
    Thanks for your prompt response. 

    Would you be able to recommend any TI inductive boost converter optimized for low currents to match my power requirements?

    Kind Regards,
    Kostas

  • 0 in reply to Kostas Papouis
    TI__Genius 11665 points

    Hi Kostas,

    Thanks for your response. Please give us time. We will be back with an answer at the beginning of next week.

    Kind regards,

    Moritz

  • 0 in reply to Moritz
    Prodigy 70 points

    Hi Moritz and Brigitte,

    Both     REG71050 or TPS60150 come on WSON(6) package. 
    According to their datasheets the REG71050 Junction-to-ambient thermal resistance is 119.1 °C/W whereas the TPS60150 is  69.1°C/W.

    Can you confirm that the TPS60150 will run cooler based on 30mA load (48mW power dissipation)?
    Thanks.

  • 0 in reply to Kostas Papouis
    TI__Guru 61705 points

    Hello Kostas,

    This is what I would expect.

    Best regards,
    Brigitte