I have designed a charging circuit utilising the BQ2002 and LM317 for 2x 1.2V NiMH batteries, and it is to be charged using a 5V USB input, I need the output current to be between 550 mA and 1A. I have no idea how to control the charging current.

I need some guidance on how to achieve this.

Thanks in advance

P.S: Sorry for the '9V' +VE and the missing 'LM317' reference in the schematic below.

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