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TDA2SX: PMIC placement on daughter card (other than SOC)

Part Number: TDA2SX


We are designing our vision system based on TDA2x. Due to space constraints, our PCB design engineer wants to take PMIC and associated power circuitry to a carrier/daughter PCB (i mean other than one on which)
SOC is placed. Does this approach recommended (to input power via connector/header)? If so, what connector type and routing scheme should be used?


  • This is not recommended due to the voltage drop that can occur from the multiple PCBs and connector.  Several of the TDA2x power rails are very low voltage/high current, and even the small voltage drop can cause issues.  Even with standard power supply designs (on same PCB as TDA2x), we recommend the SMPS sense point be located near the load, to compensate for any small drop across the PCB.  It is expected a connectorized solution would have even greater voltage drop (due to increased resistance). Sufficient decoupling capacitors are also required to handle both high and low frequency current demands outside the SMPS control bandwidth. 

    It might be possible to remote sense the load through higher resistive/inductive connections (like a board-to-board connector), but has not been tested/validated by TI and thus is not recommended.

  • Thanks a lot Robert. Thumbsup