BQ25606: Calculating the charge current limit and input current limit resistors

Nir Dvash1

Part Number: BQ25606

Hi,

For some reason, the formula on the device's DS for calculating the charge current limit resistor and input current limit resistor is not clear to me.

I wish to set them both to 3A. Can someone please clear this for me?

Thank you!

Nir

over 4 years ago

0 Ning T over 4 years ago

TI__Guru 57341 points

Nir,

Please visit https://e2e.ti.com/support/power-management/f/196/t/890626 for BQ25606: Schematic Review and PCB Layout Design Tips. Additional Information including FAQs is available http://www.ti.com/lit/an/slva924/slva924.pdf Designing A Standalone Single Cell 3-A Charger with the bq25606. These documents should be helpful to your questions.

Thanks,

Ning.

0 Nir Dvash1 over 4 years ago in reply to Ning T

Intellectual 470 points

Hey Ning,

Just to make sure I got it right: To set the charging current to 3A, I need to place a 225 ohms resistor from the ICHG pin to GND?

Nir.

0 Ning T over 4 years ago in reply to Nir Dvash1

TI__Guru 57341 points

Nir,

ICHG=677/RICHG

Thanks,

Ning.

0 Nir Dvash1 over 4 years ago in reply to Ning T

Intellectual 470 points

Thank you Ning.

Can you please review the below schematics and make sure it has no mistakes in terms of the BQ charger which is set to:

Input current limit - 3A

Fast charge current - 2A

Charging Voltage - 4.208V

No USB functions needed.

No OTG needed.

Thank you!

Nir.

Thank you,

Nir.

Design.pdf

0 Ning T over 4 years ago in reply to Nir Dvash1

TI__Guru 57341 points

Hi,

Please refer to https://e2e.ti.com/support/power-management/f/196/t/890626 for BQ25606: Schematic Review and PCB Layout Design Tips and http://www.ti.com/lit/an/slva924/slva924.pdf Designing A Standalone Single Cell 3-A Charger with the bq25606.

Thanks,

Ning.

Power management

Power management forum

BQ25606: Calculating the charge current limit and input current limit resistors