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TPS61222: TPS61222

Amr Qasem
Prodigy 10 points
Part Number: TPS61222
Other Parts Discussed in Thread: TPS61299

Hi, 

I have recently used TPS61222 boost converter 
But I notice when I turn it off, (0 at EN pin ) there is still voltage and current passing through
The datasheet mention that the Shutdown current should be 0.2 μA but, the boost converter supply the device with  a couple mA current!! 

the datasheet also says: 
10.3.2 Device Enable And Shutdown Mode The device is enabled when EN is driven high, and shut down when EN is low. During shutdown, the converter stops switching and all internal control circuitry is turned off. During shutdown, the input voltage is connected to the output through the back-gate diode of the rectifying MOSFET. 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.

Regards

  • 0
    TI__Genius 12245 points

    Hi Amr,

    TPS61222 is in pass-through mode during shutdown, as the d/s said, the output is connected with input through the internal diode.

    Please noted that the test condition of shutdown current, VOUT >= VIN, it means the internal diode is blocked when testing.

    If you need true shutdown feature during shutdown (means that the VOUT is disconnected with VIN so there is no current from VIN to VOUT during shutdown).

    We recommend to use TPS61299, the latest generation of low-iq, low input voltage Boost device.

    Let me know if you have any more question.

    Regards,,

    Nathan