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High PSRR LDO recommend

BX27
Genius 3870 points
Other Parts Discussed in Thread: TPS7A47, TIDA-00270

Hi

we have trouble in choosing an LDO with following requirements. The PSRR is critical, TPS7A4701's PSRR is basically ok, but it's Iout is maxim 1A.

Could you please recommend some part? Thanks a lot ! 

Vout： Adjustable,max 10V

Iout： max 2A

PSRR：higher than 50dB @ 500KHZ~1MHz; in worst case , 40db is acceptable

Output Voltage Noise: as low as possible. target with TPS7A4701, higher than TPS7A4701 is ok.

  • 0
    TI__Guru 55940 points
    Hi Yi,

    The Vout and current requirement drastically limit the options available. One thing you could consider is paralleling two TPS7A47 LDOs similar to TIDA-00270. This would give you your voltage and current requirements but will take more components and board space.

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    Genius 3870 points
    Thanks, Ryan!
    I think we have to try to limit load current under 1A, because the board space is very limited. Paralleling LDOs is one reasonable solution, but need to be reviewed by our team.
    By the way, what is the difference between TPS7A4701 and TPS7A47?
  • 0 in reply to BX27
    TI__Guru 55940 points

    Hi Yi,

    TPS7A47 is the family name for TPS7A4700 and TPS7A4701.  I referred to the family of devices because my statement applies to the entire family and not just a specific option within the family.

    Very Respectfully,

    Ryan