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TPS61033: Question about boost DCDC with VINDPM function.

Kazuya Nakai59
Guru 21155 points
Part Number: TPS61033
Other Parts Discussed in Thread: BQ24610, TPS61376

Hello guys,

One of my customers is looking for a DCDC boost converter IC which has VINDCM(Input Voltage Dynamic Power Management) function.

The customer wants to build a product like the following.
Input: 5V(connected to USB port of PC or mobile battery by USB type-A cable)
Output: 6.5V/2A(Max)

They know that it is not possible to realize 6.5V/2.5A(Max) output from USB type-A.
But the requirements is come from their end customer.
So they are looking for a DCDC boost converter IC which has VINDCM(Input Voltage Dynamic Power Management) function though output current is reduced to less than 1A.

Do you have any boost converter which has such function?
Or is their any way to realize the function using TPS61033 with any other IC?

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    TI__Genius 10535 points

    Hi Kazuya,

    I am sorry that TPS61033 can't support 6.5V output voltage, the maximum voltage of TPS61033 is 5.5V.

    Could you please explain more about the so called VINDCM? Does it mean the output is needed to be stable when input voltage changes? If that, may I know the minimum voltage of input voltage? Thanks.

    Regards,

    Nathan

  • 0 in reply to Nathan Ding
    Guru 21155 points

    Hi Nathan,

    Thank you very much for your reply.

    I'm sorry DCM is typo. Correct is DPM.
    BQ24610 has VINDPM function

    BQ24610
    https://www.ti.com/product/ja-jp/BQ24610

    If TI has a boost converter which has VINDPM function, could you please tell me?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Genius 10535 points

    Hi Kazuya,

    I am still a little confused about the VINDPM. In charge device, it can reduce the charging current when the input power limit is reached, But for Boost device, what customer want when the input power limit is reached? To reduce output voltage? It can't reduce output current because output current is decided by the load. So the only way to limit power is to reduce the output voltage.

    If that, all of the Boost have this function, I mean input current limit function. When the input current hits the current limit, the output voltage is reduced to reduce power.

    But one thing is what the most Boost devices limit is actually the inductor peak or valley current (for TPS61033, it is valley), the inductor current is approximately equal to but not perfectly equal to input current, so the accuracy is not very high.

    If customer need high input current limit accuracy, by now only TPS61376 has this feature because TPS61376 limit input average current not valley or peak current.

    Let me know if you have more questions.

    Regards,

    Nathan

  • 0 in reply to Nathan Ding
    Guru 21155 points

    Hi Nathan,

    Thank you very much for the device information.

    I will introduce TPS61376 to the customer!

    Could I ask you one more question?
    What is happen at VOUT of TPS61376 when the input average current is exceeded the current value set by a external resistor?
    Does the output voltage go down to lower voltage because the input power is limited?
    Or is the output shut down and restarted automatically after a few seconds like auto retry function?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Genius 10535 points

    Hi Kazuya,

    The output voltage go down to lower voltage when it hits current limit you set.

    Regards,

    Nathan

  • 0 in reply to Nathan Ding
    Guru 21155 points

    Hi Nathan,

    Thank you very much for your reply.

    I understood.

    Thank you again and best regards,
    Kazuya.