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TPS63020: Clarification required on Boost Mode Current

Abuthahir Tajudeen
Prodigy 120 points
Part Number: TPS63020
Other Parts Discussed in Thread: TPS63802

Dear TI Support Team,

In TPS63020 datasheet it is stated that, the maximum current in the boost is 2A (Page #13, 8.1 Application Information).

My application draws 2.2A in boost mode.

VIN = 3.0 V

VOUT = 3.7 V 

IOUT = 2.2 A

But the inductor peak current is going as high as 2.75A for my application. I've simulated the requirement with WEBENCH Tool. It worked actually.

I want to know is this work in realtime also?

  • 0
    TI__Expert 7925 points

    Hi Abuthahir,

    Thank you for reaching out.

    This is very close to the maximum capability of the TPS63020. For short pulses it should be fine, but not for continuous operation at 2.2 A, where thermal limits can be reached.

    For your operating conditions, I suggest using the TPS63802 instead. 

    Best regards,
    Milos



  • 0 in reply to Milos
    Prodigy 120 points

    Hi Milos,

    Thanks for your reply. Why WEBENCH simulation is not supporting more than 2A for TPS63802, although the IPEAK for boost mode operation is 5.75 A.

    Kindly clarify.

  • 0 in reply to Abuthahir Tajudeen
    TI__Expert 7925 points

    Hi Abuthahir,

    Please note that the Ipeak that you mention is the switch current limit, not the maximum output current. How does switch current limit translate to the maximum output current depends on the operating conditions. 

    If you look at the TPS63802 datasheet, Figure14, the device can support more than 2 A, depending on the input/output voltages. Your case is close to the Vout = 3.6 V curve, and the device should provide up to around 2.5 A at Vin = 3 V. However, note that these results are valid at ambient temperature, on our evaluation module. At higher temperatures or different PCB layouts, the thermal limit might reduce the maximum output current.

    You could also make simulations using the TPS63802 PSpice model, which you can download on the product page.

    We will have to check why there is a limit in Webench at 2 A. Thank you for pointing that out.

    Best regards,
    Milos