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TPS61322: Using the TPS613222A w/o battery as a source

T.Mali
Prodigy 30 points
Part Number: TPS61322
Other Parts Discussed in Thread: TPS62177

Currently I use a TPS62177 as 3.3V voltage source for my application.
There are applications in which a USB stick is to be connected to the device for various purposes. For this I need a second 5V power source to operate the USB host interface. Is there any argument against feeding the TPS613222A from the TPS62177? The TPS613222A data sheet only lists battery-powered applications.

  • 0
    TI__Mastermind 40080 points

    TPS613222A can support a very wide Vin range.  What is the Vin and Vo, Io for TPS613222A in this case?

  • 0 in reply to Helen chen
    Prodigy 30 points

    The input voltage is approx. 3.2-3.4V, the output voltage is 5V/ max. 0.5A.
    Of course I noticed that the TPS62177 is overloaded at 5V/ 0.5A. In this case, another switching regulator would be used, which could supply the required power.
    What amazes me at this point is that the data sheet only talks about battery-powered applications. In terms of simplicity and price, the TPS613222A is of course also very interesting for other applications, provided there are no restrictions that speak against using a 3.3V switching regulator as a source for high-transforming the voltage to 5V with the TPS613222A.


    Best Regards

  • 0 in reply to T.Mali
    TI__Mastermind 40080 points

    The maximum output capability mfor the TPS613222A is around 0.2A without the external diode. If you want to use it with 0.5A output, please add the external diode and RC snubbber. Please check the section 1.5 in the attached user guide.SLVUBD9_final.pdf