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TPS51601A: Integrated Boot Switch

Jerry Leung
Prodigy 175 points
Part Number: TPS51601A
Other Parts Discussed in Thread: TPS51604, , TPS51604-Q1

Hi Team,

Saw this locked E2E post and want to follow up on it as I have the same question in my application:

"I noticed that TPS51601A has an integrated n-fet (boost switch) for bootstrap operation. How is this n-fet powered, as its source is 5 V? And is there a level-shifter for the gate signal (DRVL)?"

I also want to know if there is a minimum VIN requirement?

Thanks for the help in advance and best regards,

Jerry

  • 0
    TI__Mastermind 24075 points

    Hi Jerry, 

    The internal boost switch should be powered by level shift circuit. 

    DRVL is iow side gate drive, it does not has level shift circuit. 

    The minimum VDD for TPS51604 is 4.5V. 

    There is no minimum Vin (power Vin for MOSFET) requirement from TPS51604 side. 

    Thanks

    Qian

  • 0 in reply to Qian Chen
    Prodigy 175 points

    Hi Qian, 

    Just want to follow up real quick, I noticed you mentioned TPS51604 rather than the TPS51601A so want to verify that the TPS51601A also has the same characteristic and doesn't have a minimum Vin.  They look like very similar devices but want to be absolutely sure. 

    Thanks for the help and best,

    Jerry

  • 0 in reply to Jerry Leung
    TI__Mastermind 24075 points

    Hi Jerry, 

    Sorry for the typo, I mean TPS51601A in my previous reply. 

    Thanks

    Qian

  • 0 in reply to Qian Chen
    Prodigy 175 points

    Hi Qian,

    Actually, could you help provide a quick comparison between the 2 parts? I took a closer look into the TPS51604 and it mentioned that it has a Conversion Input Voltage Range (VIN): 4.5 to 28 V while the TPS51601A doesn't, but the functional block diagram looks to be the same.  Is there something internally different between the 2?

    The TPS51604 seems to be a newer part, so I'm curious to see if this is possibly applicable for my design.

    Thanks for the support with all my questions.

    Best,

    Jerry

  • 0 in reply to Jerry Leung
    TI__Mastermind 24075 points

    Hi Jerry, 

    These two devices have different size and EC spec.   

    Also, TPS51604-Q1 is qualified for automotive application. 

    I think you can check the spec and pick either one fitting your application. 

    Thanks

    Qian