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TPS61022: Maximum Output Current

Kaushal K
Prodigy 80 points
Part Number: TPS61022
Other Parts Discussed in Thread: TPS61088

Tool/software:

Hi team,

We are developing a boost converter circuit for our application and need some guidance regarding output current.

At the input of the boost circuit, Li-Po battery would get connected so the input voltage would vary between 2.8V to 4.2V.

We require a boost converter that can accept specified input voltage and provide an output of at least 5V and 4A. Can TPS61022 support 4A current even at lower battery voltages? If not, please suggest an alternate part which meet the specification.

Thanks in advance!

Kaushal K

  • 0
    TI__Guru 61705 points

    Hello Kaushal K,

    The experts to the boost converters are out of the office today due to a holiday.

    You can calculate the minimum current needed on the switch with the minimum input voltage and the maximum output power. In your case 2.8V and 20W.

    So the input current at maximum output power will be 7.2A. Some margin for the ripple on the inductor current and for efficiency losses in the system are needed, so a good starting point is a device with a switch current of 9.5A at least would be necessary.

    TPS61022 has worst case a peak current of 6.5A, so it will not be able to deliver full power at lowest input voltage.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    TI__Genius 10165 points

    Hi Kaushal K,

    Unfortunately the TPS61022 can't support 5V/4A when input voltage is as low as 2.8V.

    Please use the TPS61088 as an alternate part.

    Regards,

    Nathan