BQ27426: What's recommend range of Rsense value?

Che yi Su

Part Number: BQ27426
Other Parts Discussed in Thread: BQ40Z50-R1, , BQ40Z50

Hi,

What's recommend range of Rsense value? It recommend 10mohm in datasheet. I want to change 5mohm. Is it suitable for SRN-SRP? Meanwhile, would you provide recommend value for "Input voltage range of SRN-SRP"?

Below value looks like "Absolute value."

over 6 years ago

0 Onyx Ahiakwo over 6 years ago

TI__Guru* 76230 points

Che yi Su
yes you can change to 5 ohm. Ensure you run the calibration routine afterwards so current measurement can be accurate

The value below is not absolute. Why do you think it is absolute. Its typical value e is battery voltage +/- 25 mv adde

thanks
Onyx

0 Che yi Su over 6 years ago in reply to Onyx Ahiakwo

Expert 1695 points

Hi Onyx,
I found BQ40Z50-R1 recommend range is "+/- 0.1V". BQ27426 is "BAT +/- 25mV" and VBAT recommend value is 2.45V to 4.5V. Is it mean BQ27426 recommend input voltage on SRN-SRP range higher than BQ40Z50-R1?

0 Onyx Ahiakwo over 6 years ago in reply to Che yi Su

TI__Guru* 76230 points

No. The bq40z50 has higher range. Note that it is the voltage drop across the pins that is measured

thanks
Onyx

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BQ27426: What's recommend range of Rsense value?