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TPS61222: Voltage output when disabled?

Ron Segal20
Intellectual 360 points
Part Number: TPS61222
Other Parts Discussed in Thread: TPS61099

Hi All,  Can someone please confirm that for this series  (TPS6122x) of boost converters a voltage will always appear on the output (i.e. the battery voltage is effectively passed through), irrespective of the state of the Enable pin?

Which is what I'm reading from the manual i.e. 

'This means that voltage is always present at the output, which can be as high as the input voltage or lower depending on the load.'

So this device cannot be used to entirely switch-off the power to the load?

If this is correct, I'd appreciate help identifying a very low quiescent current device that is able to boost 3.3 volts to 5 volts (at, at least 200mA), whilst being able to be completely shut off power to the load.  Many thanks, Ron.

  • 0
    TI__Mastermind 46905 points
    Hello
    your understanding is correct. there is voltage at output when the TPS61222 is shutdown by EN pin.
    i would suggest TPS61099 from current information.
    but i need to double confirm your requirement. the "quiescent current " normally mean the current during the device is enable. why do you need both total shutdown and very low quiescent current, considering the output current reach at least 200mA.
  • 0 in reply to Jasper Li
    Intellectual 360 points

    Thanks Jasper, appreciate the confirmation and suggested alternative device.

    The TPS61099 looks ideal, with a true shutdown, although I'm a little uncertain of the suitability of the package's tiny BGA format for easy, manual solder stenciling during prototype assembly! 

    The requirement for low quiescent current, you're correct, is a little bit 'belt and braces'. The aim is to also minimise the contribution of the enabled device to overall current draw, even though this will be very minor (insignificant even) for the short periods that the device is active.  Mostly it will be sleeping.

    Cheers, Ron