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TPS62561: inverting buck application

Ben Kuo
Expert 7570 points
Part Number: TPS62561

Dear team,

I need a negative output voltage(-0.8V_out) for RF ADC application which only consume 200mA load current.

The ripple performance have to within +/- 24mV.

Is TPS62561 a right solution? (It's acceptable, if we need to design an extra inductor/bead  to improve ripple performance)

Application: 

3.3Vin to -0.8Vout @ 200mA load current.

Regards,

Ben

  • 0
    TI__Expert 3611 points

    Hi Ben,

    A buck converter in an inverting buck-boost topology can be made by following this reference design: TIDA-01405, different buck converters can be used in place of the one given in the reference design. 

    The least time consuming design should be to use a module with an integrated inductor such as the TPS82084.

    For a converter without the integrated inductor (a less expensive option), I could recommend the TPS62821. Or for an even more cost-optimized approach the TLV62568A could be a good solution as well.

    Note that the TPS62561 you mentioned has a minimum Vout of 0.85, so in the inverting configuration it cannot reach the -0.8V of your specifications.

    Kind regards,

    Davor

  • 0 in reply to Davor Pavlovski
    TI__Expert 3611 points

    Hi Ben,

    Since we continued our communication over e-mail, I will close this thread.

    Regards,

    Davor