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TPS65653-Q1: Alternate part for TPS65653

Karthik B
Expert 1310 points
Part Number: TPS65653-Q1
Other Parts Discussed in Thread: TPS650861, LM3248

Hi Team, 

I am looking for an power IC whose output voltage can be  controlled by an FPGA via I2C or GPIO  and that output voltage can be varied in steps of 0.1V/100mV steps.

I need two channels in a single IC this is the minimum requirement of the voltage.
Channel 1: 1.2V to 1.97V @1A
Channel 2: 2.6V to 3.6V @ 1A

TPS65653-Q1 This part can only support upto 3.36V max so its limited and we need to have the voltage that can be varied upto 3.6V 

Please suggest a best part for the same.

Regards,

Karthik

  • 0
    TI__Expert 8730 points

    Hi,

    I could not find any alternate part which is similar to TPS65653-Q1 and can support up to 3.6V output. But I will ask around  in our team and if we find suitable part, we will get back to you.

    Regards,

    Murthy

  • 0 in reply to Krishnamurthy Hegde
    Expert 1310 points

    Hi Murthy,

    Thanks for the response, could you please suggest a bit faster as I need to update to our customer to proceed with the design.

    Regards,
    Karthik

  • 0 in reply to Karthik B
    TI__Genius 17380 points

    I can confirm that I am not aware of a dual buck product which has voltage scaling on a 3.3V rail to up to 3.6V.

    TPS650861 goes up to 3.575V, which is more than most PMICs, but it is not a good fit for the application.

    For curiosity, can you describe the FPGA and use case where this voltage scaling would be necessary?

  • 0 in reply to Kevin LaRosa
    Expert 1310 points

    HI Kevin,

    Thanks for your response. 

    TPS650861 as you said is the not exact fit

    We have a IC that has two inputs VCCA=1.8V and VCCB=3.3V and VCCA/VCCB can be in the range of VCCA=1.2V to 1.97V and VCCB=2.7V to 3.6V, so apart from the typical voltage values we also need to verify our IC with all the supported voltage range and that we will do by incrementing the voltage in steps of 100mV. 

    we have xilinx based FPGA on board and we are planning to use an I2C or any GPIOs to controll the power IC and change the output voltage by programming the power IC with 100mV changes and validate our test IC.

    This is our whole requirement

    Regards,
    Karthik

  • 0 in reply to Karthik B
    TI__Genius 17380 points

    Thanks for the clarification Karthik - makes sense to me now that you would want to test the full range during validation.

    I reviewed a variety of PMICs but unfortunately TPS650861 was the only one I could find that went above 3.4V. Have you posted separately for discrete power parts? If not, I would recommend it. I did a quick check for you but did not find anything with I2C control above 3.4V except maybe LM3248, though I think you'd have to use a DAC from the FPGA to use it maybe? It's not in my group so I'm not familiar with it.