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Original question:

TDA2EVM5777: Matching Question between TDA2SXBTQABC(SOC) and TPS659039(TPS659039 Orderable device: O9039A387IZWSRQ1; Device...

TDA2EVM5777: TDA2EVM5777

Joseph Wang Wang
Intellectual 520 points

Part Number: TDA2EVM5777

Please help to evaluate possibility and potential risk below.

PS_EVM_5V0 are input source of LDO7USB_IN1, LDOUSB_IN2, LDO12_IN;

We want to remove PS_EVM_5V0 power supply, we don't use LDOVANA_OUT,

we want to connect LDOUSB_OUT/LDOVRTC_OUT/LDO1_OUT/LDO2_OUT with PS_EVM_3V3 power supply directly;

  • 0
    TI__Mastermind 18640 points

    Hi Joseph,

    LDOs in the PMICs serve for 2 main functions:

    1. They provide low-noise, stabilized output. SMPSes are not so low-noise.

    2. They start (at power-on) at the exact moment validated for the SoC. Please see the Power Sequencing diagram in the SoC Datasheet for details.

    You can evaluate further how to achieve both functions externally. But please note that this cannot be supported nor guaranteed by TI.

    Regards,

    Stan