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TPS7A16A-Q1: LDO selection for 48V automotive

Jerry Hu
Prodigy 695 points
Part Number: TPS7A16A-Q1

Tool/software:

Hello team

One of my customer is searching for a LDO, this is the diagram of their system(Wireless key module in automotive)

typical current: more than 100mA, I want to find a DCDC for them, but they have RF module, so maybe LDO is the best choice. However, I don't find out a LDO with 48V input and 200mA output.

Could you please help for suggestion about LDO? Many thanks!

  • +1
    TI__Expert 6680 points

    Hi Jerry,

    Stepping down 48V to 5V at ~200mA is roughly 8.5W of power dissipation, which is too much for an LDO to handle. In this case, for powering noise-sensitive loads like RF, I recommend using a buck to step down to an intermediate voltage (ex. 6V), then using a low noise/high PSRR LDO after the buck to clean up the power rail. In this case, TPS7A21-Q1 would be a good choice.

    Please note that if the output current requirement was lower, a 48V to 5V conversion might be possible with an LDO. I will email you some content I've put together re: automotive LDOs for 48V systems.

    Regards,

    Kelsey