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TPS62233DRYR - MINIMUM REQUIRED INPUT FOR THE SWITCHING REGULATOR

Dibin G
Prodigy 110 points
Other Parts Discussed in Thread: TPS62088, TPS62821, TPS62801

I have used TPS62233DRYR switching regulator in the design of a tracking system. in the output maximum current consumption is about 250mA.

As per the datasheet, this regulator needs Vout+1 volt as the input voltage Vin for 500mA.

Now we are planning to connect a single lithium polymer cell (3.7V) to the input.

Could you please help by providing the information about the minimum required voltage range for the regulator to get the output range of minimum 2.8 to 3V.

  • 0
    TI__Expert 4155 points

    Diblin,

    The Vin > Vout+1V you are referring to is a test condition. The minimum input voltage for your design can be calculated using the equation in section 8.4.4. For this equation you should use 850 mohms for Rdson.

    Please let me know if you need anything else.

    Thank you,

    Nick

  • 0
    TI__Guru**** 150650 points
    Hi Dibin,

    Nick correctly addressed why the recommended operating conditions table is written that way: this device has a higher Rdson which prohibits meeting the requirements of some higher current, lower dropout applications. Let us know if there is still some question on this topic.

    As well, we have the newer TPS62821 which offers much lower dropout performance. If you can accept a BGA/WCSP package, we also have TPS62088 and TPS62801 which are very small.