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BQ24297: EMI

Part Number: BQ24297
Other Parts Discussed in Thread: TPS61169

Hi team,

My customer is evaluating the bq24297 in their system. They have been conducting an noise emission test with their board which integrated bq24297 and TPS61169(LED driver) . The customer says that they see large noise emissions at 50 to 70 MHz and 150 to 200 MHz, and that they are taking action, but they are not able to reduce the noise. They say that disabling the TPS61169 did not cause any change in the noise emissions. Therefore, this noise seems to be generated by bq24297. Also, when the customer stopped the charging and supplied the power from battery, the noise emission was reduced, so the DC/DC switching operation of bq24297 converter may affect to the noise emission. The input power source is USB 5V.

Do you have any countermeasure for the noise emission? If the bq24297 setting prevents this noise emission, could you tell me it?