BQ25731: Does BQ25731 have pre-charge function?

Yuting Li

Intellectual 1420 points

Part Number: BQ25731

Hi team,

Does BQ25731 have pre-charge function? If it is, what is the BAT voltage threshold? What is the charge current? Thanks.

over 4 years ago

0 Pengzhao Zhu over 4 years ago

TI__Genius 11385 points

Hi Yuting,

For BQ25731, I just did some quick tests with the EVM in the lab.

Charge current was clamped to ~384 mA before 3V. From ~3V to ~3.6V, charge current was clamped to 2 A. For > 3.6 V, charge current was determined by the charge current register.

We have the EVM for evaluation if needed.

https://www.ti.com/tool/BQ25731EVM

Thanks and I hope this helps,

Peng

*If my answer solves your question, please press "This Resolved My Issue" on the thread.

0 Yuting Li over 4 years ago in reply to Pengzhao Zhu

TI__Intellectual 1420 points

Hi Pengzhao,

Thanks for your help. Is it for 1s battery or 5s batter?

0 Pengzhao Zhu over 4 years ago in reply to Yuting Li

TI__Genius 11385 points

Hi Yuting,

What is the cell count of your application? My last reply was for 1s.

Thanks,

Peng

*If my answer solves your question, please press "This Resolved My Issue" on the thread.

0 Yuting Li over 4 years ago in reply to Pengzhao Zhu

TI__Intellectual 1420 points

Hi Pengzhao,

It uses 4s battery.

+1 Pengzhao Zhu over 4 years ago in reply to Yuting Li

TI__Genius 11385 points

Hi Yuting,

For 4S, there is a threshold at ~12.3 V. Before ~12.3 V, the charge current will be clamped to ~384 mA. After VBAT rises above 12.3 V, the charger current will be determined by the charge current register.

Thanks and I hope this helps,

Peng

*If my answer solves your question, please press "This Resolved My Issue" on the thread.

0 Yuting Li over 4 years ago in reply to Pengzhao Zhu

TI__Intellectual 1420 points

Hi Pengzhao,

Thanks for your help!

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BQ25731: Does BQ25731 have pre-charge function?