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TPS63050 ULVO

Other Parts Discussed in Thread: TPS63050

Regarding the TPS63050 and it UVLO.

Datasheet says it about 1.7V +- 200mV.

Also the min vin to keep output at rated current is 2.7V.

As a battery discharges (taking current), when exactly will the Vin input be disconnected.

approx. 1.7V or 2.7V.

Just trying to work out if this may cause damage to the lithium battery as it discharges?

Thanks

  • According to the datasheet the TPS63050 enters UVLO when the supply voltage drops (VIN falling) below 1.7V typical (min 1.6V, max 1.8V). It will attempt to restart with a hysteresis of 200mV, which means typically at 1.9V.

    2.7V is the minimum input voltage to turn on into full load (500mA). This has nothing to do with UVLO. The device will start at lower input voltage, depending on the load of course.

  • OK thanks,  But can you still draw the 500mA from the output pin between the vin range of 2.7V down to 1.7V where it switches off. Or is the current limited in this range and you would need to monitor it some how.

    The power good signal, I don't think turns off until the UVLO trips.

    thanks

    Lee

  • This UVLO of 1.7V seems very low.

    As this device is meant to be used with Li ION cells, the cell would be damaged by this point.

    It probably needs a separate protection circuit as well. Assuming battery does not have it already. Not all battery source include this in the pack.

    Thanks.

  • The TPS63050 is not designed for being used with a certain battery chemistry only. So its UVLO is not targeted for protecting batteries which are used to supply the device. It is built in to shut down the converter if its supply voltage is not high enough for reliable operation.