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TPS65720: TPS65720 PSRR of LDO

Nicholas Carley
Expert 8465 points
Part Number: TPS65720
Other Parts Discussed in Thread: TPS65217, TPS65218D0, TPS65000-Q1

Hello,

I don't see a PSRR spec for the integrated LDO, we want to use this on a noise sensitive rail. Where can I find this spec?

Thanks,
Nick

  • 0
    TI__Mastermind 30260 points

    Nick,

    Sorry for the delay. I am looking into this now.

  • 0
    TI__Mastermind 30260 points

    Nick,

    For the most part, PMICs will only specify Line Regulation and Load Regulation for sudden changes in Supply (Line Regulation) and Load conditions.

    This is the cast for many PMICs that are intended for specific chipsets. For example, the TPS65720 was initially designed to power a Bluetooth Chip, where the LDO output is connected to VIN of the Bluetooth Chip. The TPS65217 was designed for AM335x processors, and the TPS65218D0 was designed for AM43xx processors.

    The majority of these PMICs can be re-used for other purposes, but the PSRR was not a critical consideration for design and was not specified.

    The TPS65000-Q1, on the other hand, was designed for powering a sensitive analog component (camera sensor). As a result, PSRR for this LDO is specified in a certain frequency range.

    If you provide more info on what the PMIC will power in your system, we can help determine the best PMIC for the application.