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TPS62802: Load disconnect in TPS62802 and TPS6208x devices

Part Number: TPS62802
Other Parts Discussed in Thread: TPS62082, TPS62088, TPS62743, TPS62748

The feature list on the TI website for both the TPS62802 and TPS62082 device lists "load disconnect". In the data sheets however, there is no mention of this. Before I use the devices, I would like to know: Have both ICs the ability to completely disconnect the load on disabling via ENABLE pin? Not only regulator disable, but no current flow to the load.

Best regards

  • Hi Florian,

    Yes, most all buck converters and the TPS62802 open the high side switch when they are off. This is the only current path to the load.

    As well, TPS62802 has output discharge which will bring the output voltage back down to 0V when it is off. Not all devices have this.

    The TPS62802 and TPS62082 are very different devices. I'm surprised that you are looking at both of them. What Vin, Vout, and Iout do you need in your application?
  • Hi Chris,

    thanks for the info. The reason I am looking at quite different converter series is my main design constraint: Size and peripheral part count. My application is heavily miniaturized, battery powered and reliant on high efficiency, therefore I am looking for the smallest possible solution with high efficiency. My VIN is a LiIon battery, so 4.2-3V. VOUT is 3V to 3V3 (Still checking with the manufacturer of the load) at min. 600mA. The 3V load is controlled by a ULP 1.8V circuit via ENABLE, so to save power there should be no current leaking through the converter while it is disabled. As the 3V load is a wireless communication device, low ripple is required.

    If you have a recommendation for a more integrated solution, I am happy to hear it :-)

    Regards,
    Florian Grabi
  • Thanks for explaining. Yes, TPS62802 is the smallest device. TPS62082 is much larger.

    In case your final Vout does not align with the discrete Vout settings on TPS62802, we have the fully adjustable TPS62088.

    If you have a lower current rail and need a load switch, we have the very low Iq TPS6274x family, such as TPS62743 and TPS62748.
  • Thank you for the info! I will take a look at the parts.

    Regards
    Florian Grabi