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TPS659037: Using with 3.3V input?

Michael Shklyarman
Genius 12710 points
Part Number: TPS659037
Other Parts Discussed in Thread: AM5726

Champs,

Customer is looking to re-use AM5726 based design for another product and on the new product they have only 3.3V input. The TPS659037 Recommended operating conditions state 3.8V as nominal input, I am wondering if there are any concerns with using the device with 3.3V input supply.

thank you

Michael

  • 0
    TI__Genius 9380 points
    Michael,
    That's a good question. I have forwarded your question to a product specialist to help answer this.

    Thank you
  • 0 in reply to Gordon Varney
    TI__Genius 16410 points

    Hi Michael,

    We have plenty of designs that use 3.3V to supply the PMIC’s VDD, SMPSx_IN, and 1.8V LDO inputs.  But you will need 5V on LDO inputs in order to be able to regulate 3.3V on the LDO outputs.

    If you really only have 3.3V, you possibly could use load switches to sequence this 3.3V to the SoC, with each load switch enabled by the respective LDO.  But you would have to make sure this still meets the sequencing requirements of the processor.

    Otherwise, I think they may need to boost the 3.3V to 3.8V or higher for the LDOs to supply 3.3V out.

    You can see the TPS659037 User's Guide for AM572x, the first block diagram uses 3.3V to supply the PMIC, with 5V to supply the 3.3V-out LDOs.  This is the configuration on the AM572x EVM.

    Regards,

    Karl