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about bq500215EVM-648 Standby power question

Kuo Nowal
Expert 2315 points
Other Parts Discussed in Thread: BQ500212, BQ500215

Hi Sir,

 

My customer( http://www.timotion.com/ ) survey wireless charger solution, target standby power need under 1mA , but have some question need you help.

Currently promote bq500215EVM-648, peak current is 10mA,

In standby mode, how to decrease Quiescent Current ? I try to led mode short to GND, but current up to 43mA

  • 0
    TI__Guru* 75656 points
    Hello Kuo
    The bq500215 will use the same low power sleep mode as bq500212 with external RC circuits.
    See FAQ section of the forum "FAQ-bqTESLA TX Sleep Mode -- RC Time Constant Based".

    Shorting LED mode to GND will disable the sleep mode and increase standby current.
    If the application is non-Qi it may be possible to increase the snooze time beyond 500mS by changing the RC time constant.
    TX will send a digital ping to detect the RX.

    To meet the Qi certification requirements the TX needs to detect RX in 500mS. This will make it difficult to get to 1mA in a certified application.