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TPS61087: can it be setup as a SEPIC?

K Ohn
Intellectual 1945 points
Other Parts Discussed in Thread: TPS61087, TPS61200, TPS40210

Can TPS61087 can be setup as a SEPIC? The input voltage range is 3.2V – 5.25V and the output voltage is 5V. The output current would be the maximum current that the switch limit can provide.

Have we ever built a SEPIC TPS61087?

Thanks! K Ohn

  • 0
    TI__Guru 65280 points

    Hello K,

    Up to now, noone built a SEPIC with TPS61087. In theory this should work very similar to the circuit in the following application report: http://www.ti.com/litv/pdf/slva337.

    I wonder if it is necessary to go to a SEPIC configuration. Having a look on the input to output voltage range, it might be possible to use a diode with a higher voltage drop and still get the right output voltage with a standard boost. The advantage is a simpler circuit and the efficiency should be in the range of a SEPIC configuration. You might test this on the EVM.

    We also have a boost converter in the portfolio that has a down mode for higher input voltage than output voltage: TPS61200.

    If the output current is not high enough, please have a look on the TPS63xxx parts which are buck-boost converters or the controllers with external switch, i.e. TPS40210. This part is tested in SEPIC configuration, e.g. there is an application note on how to build a SEPIC USB charger.

    Best regards, Brigitte