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BQ25790: Quality questions

Part Number: BQ25790

Tool/software:

HI team,

1. I think the device has shoot through protection at switching FET, how to do this?

2. Regarding the spec, is it tested in each chip when production that minimum voltage input to maximum Iout (VBUS = 3.6V and Iout = 5A)? Or is it guaranteed by IC desgin?

Regards,

Hayashi

  • Hi Hayashi,

    Our devices have varying protections to prevent against unwanted operational modes and are tested to comply with the recommended operating conditions.

    Regards,

    Jared Baxter

  • HI Jared,

    I know that, but please give a clear statement as TI? Customer's quality team would like those in order to judge the device. 

    My questions was "which mechanisms to prevent shoot through" and "Is every chips tested with specific condition in boundary (VBUS = 3.6V and Iout = 5A)?".

    Regards,

    Hayashi

  • Hi Hayashi,

    None of our chargers can be tested on a tester while switching and providing full output power.  Full output power is only tested on the bench on a few units.  Practically, the input power must be greater than the output power.  So to get 5A output with a 4.2V battery and VBUS=3.6V, the charger requires 4.2V*5A/3.6A = 5.83A, which is above the max input current rating of 3.3A.  Even at higher input voltages, the WCSP package gets too hot, causing the IC to enter thermal regulation, limiting output power, in all but a very few VBUS to VBAT configurations.

    Regards,

    Jeff