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about DSBGA package

Part Number: bq27502

Dear all,

Our customer would like to know about DSBGA package of BQ27520.

When I searched for data, I found the following data about BGA.

http://www.ti.com/lit/an/snoa021c/snoa021c.pdf

Are there any documents written about DSBGA mentioned above?

In addition, the cross section of the BGA (the following figure) was listed in the above link material. Is there a cross section of the DSBGA?

Best Regards,

Y.Ottey