BQ25173: Suitable to charge this Hcap?

Thai Hung Le

Part Number: BQ25173

Tool/software:

Hi Bill,

My customer is using the hybrid capacitor with parameters listed in table below. Could you please help to confirm if BQ25173 is a good option?

Thank you

Best regards,

Hung

+1 Bill Johns 7 months ago

Hi Hung

The BQ25173 charge the units from 2.5V to 3.8V.

Would need additional circuits to stop discharge below 2.5V.

If the BQ25173 is set to 500mA charge current:

1.) 120F - charge time 2.5V to 3.8V -- 312 sec

2.) 250F - charge time 2.5V to 3.8V -- 650 sec

0 Thai Hung Le 7 months ago in reply to Bill Johns

Hi Bill,

Thank you for the details.

Bill Johns said:
Would need additional circuits to stop discharge below 2.5V.

Do we have any paper or app notes which discusses about designing the additional circuits to share with customer?

Best regards,

Hung

+1 Bill Johns 7 months ago in reply to Thai Hung Le

Hi Hung

Take a look at BQ29706, Battery Cell Protection device. It has an Over-Discharge Detection (UVP) of 2.5V.

0 Thai Hung Le 7 months ago in reply to Bill Johns

Hi Bill,

Got it. Thank you for your advice.

Best regards,

Hung

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