BQ24210: How to calculate charging current from ISET current

Rostyslav Kurylo

Part Number: BQ24210

Hello,

The BQ24210 datasheet states that "An external resistor on the ISET pin is used to program the output current (50 to 800mA) and can be used as a current monitor.". But unlike the datasheets for other similar ICs, this one does not describe how to calculate the charging current from current through the external resistor on the ISET pin. How do I calculate the charging current?

Best regards,

Rostyslav

over 2 years ago

+1 Bill Johns over 2 years ago

TI__Guru 69641 points

HI Rostyslav

The current out of ISET is a sample of output current, the ratio between OUT and ISET is 262 to 1. For an output current of 524mA the current out of ISET is 2.0mA.

0 Rostyslav Kurylo over 2 years ago in reply to Bill Johns

Prodigy 10 points

Thanks! Do you know why this is not stated in the datasheet? Or is it specified implicitly?

+1 Bill Johns over 2 years ago in reply to Rostyslav Kurylo

TI__Guru 69641 points

Hi Rostyslav

It follows the same format used for similar converters that used constant K-ISET. This term combines both the sample ratio and reference voltage. see BQ2404X

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BQ24210: How to calculate charging current from ISET current