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TPS7A20: Asking for the TPS7A2018 design suggestion

SHH
Mastermind 30301 points
Part Number: TPS7A20

Hi Sir,

 

My customer would like design TPS7A2018.

Here is the core chip’s requirement.

Would you please review and provide comment that TPS7A2018 can meet or not?

 

 

BR,

SHH

  • 0
    TI__Mastermind 29320 points

    Hello SHH,

    We will have to test this on an EVM. If the 3.3V input supply is a switching converter, then the PSRR from the LDO will determine the amount of ripple that makes its way through the LDO.  See the figures below from the datasheet.  If the switching frequency is high (above 1 MHz) then the output capacitance will determine the PSRR.

    Is there a specification for output capacitance?  Right now here are the specifications that I can see.  We have readily available EVM's with 2.8V output, so what I can do is test this on an EVM with 2.8V output but scale Vin to maintain the same headroom, so Vin = 4.3V.

    Vin = 3.3V
    Vout = 1.8V
    Iout = 35mA to 65mA to 35mA, 0.5A/us load steps

    Thanks,

    - Stephen