Risk of using magnetic feeder about TI LDO sensor (mechanical/functional

Hi Soeun,

We do not have any test data to assess the device performance in a high magnetic field environment.  Having said that, our LDOs are often used in environments where there is a magnetic field and other types of DC/DC converters would pose an issue (I.E. inductor based or transformer based switching converters).  Unless you have a very high frequency magnetic field, the issue would not be in the IC itself, it would be in the PCB layout.  This is because the internal LDO traces are too small to act as quality antenna's.  Thus, your goal would be to limit the PCB trace length as much as possible to be well under the maximum wavelength you expect to see in your magnetic feeder.  You can try testing our EVM's in your magnetic field environment if you want a cheap and easy way to prove these devices will work in the application.

I would recommend using the 2.85V version of the TPS7A20 over the LP5907.  The TPS7A20 is the new generation device of the LP5907.  The TPS7A20 supports higher current, has improved stability, and is cheaper than the LP5907.  The LP5907 has a faster turn on time than the TPS7A20, but that is the only real reason you would use the LP5907.

Thanks,

Stephen