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TPS61025 & TPS62172 in parallel

Jan Zastera
Intellectual 260 points
Other Parts Discussed in Thread: TPS62172, TPS61025, TPS61070

Dear Ti,

could I ask you if it is possible to connect TPS61025 + TPS62172 in parallel and use one of them for powering our application (3.3V/200mA). The one, which is not used will be disablet pulling EN to low. We need to have 2xAA powering and also external 5-15V powering for our application and this  would be the easiest way to power it.

Thank you a lot!

Jan Zastera
BETSO ELECTRONICS Ltd.

  • 0
    TI__Guru**** 151520 points

    First, for a 2 AA to 3.3V at 200 mA boost, I would recommend the smaller, simpler TPS61070 over the TPS6102x family.

    This kind of thing is usually ok, but let me note some things out loud.

    When any buck converter has a voltage on its output, that voltage appears on the input also through the inductor and high side FET body diode.  This is usually ok, but to be aware of.  If there is any other circuitry connected to the input, it will be powered.

    Be sure to operate the boost in power save mode.  If operated in forced PWM mode, it will attempt to sink the output voltage if it thinks it is too high.

    You can always add a diode to the output of the buck to prevent any issues.

    You might also check in the power interface forum for powering OR'ing solutions.

  • 0 in reply to Chris Glaser
    Intellectual 260 points

    Chris,

    thank you very much for response. Perfectly answered. As you wrote, we can add diode to Buck output or to input to prevent current flow to its input, just in case.

    Have a nice time!

    Best regards,

    Jan