BQ24105: Charging selection for Nimh 6V, 1200mAh similar to BQ24105

Harish Kommineni

Prodigy 30 points

Part Number: BQ24105
Other Parts Discussed in Thread: , TPS54331-Q1

Hello,

I would like to know the alternative solutions similar to BQ24105 stand alone charger.

Application : NimH Battery Charging 6V 1200mAH, charging current : 120mA.

over 6 years ago

0 Steven Bangdiwala over 6 years ago

TI__Expert 8690 points

Hi Harish,

The options for standalone are the following: http://www.ti.com/power-management/battery-management/charger-ic/products.html#p338=NiMH&p1341=Standalone (RC-Settable)

Regards,
Steven

0 Harish Kommineni over 6 years ago in reply to Steven Bangdiwala

Prodigy 30 points

Hi Steven,

Thanks for the recommendation, I do not find the AECQ info for these standalone charger ICs.

My requirments are as follows:

Input Voltage : 8 to 16 V

Charging spec : 6V, 120mA charging current, Standalone

Temp: -20 to 85

Automotive Qualified.

Regards

Harish

0 Steven Bangdiwala over 6 years ago in reply to Harish Kommineni

TI__Expert 8690 points

Hi Harish,

Currently, the chargers that are able to support NiMH are the ones in the above link. There have been some automotive customers that still use those devices. What will be the application for this?

Regards,
Steven

0 Steven Bangdiwala over 6 years ago in reply to Steven Bangdiwala

TI__Expert 8690 points

Hi Harish,

There is an application note that explains how to use the bq24105-Q1 for automotive applications with NiMH: www.ti.com/.../slua843.pdf

Regards,
Steven

0 Harish Kommineni over 6 years ago in reply to Steven Bangdiwala

Prodigy 30 points

Hi Steven,

Thanks for the Guidance. My application was to charge the NimH Battery pack in the automotive environment. It would be like a backup battery for certain functions.

My requiremnet are as follows:

Battery Spec: 6V, 1200mAh

Charging spec : 6V, 120mA constant current, standard charge

Temp: -20 to 85.

Regarding BQ24105-Q1, it is an automotive qualified but the maximum voltage rating is mentioned as 20V in the datasheet.

Can it withstand Jump start voltage of 24V for 1 minute.?

Thanks

Harish

0 Steven Bangdiwala over 6 years ago in reply to Harish Kommineni

TI__Expert 8690 points

Hi Harish,

I don't think that the bq24105-Q1 can withstand that much jump start voltage for 1 minute. You could, however, try to use a buck converter rated for a higher voltage (like the TPS54331-Q1) before the charger input to make sure we do not exceed 20V.

Regards,
Steven

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BQ24105: Charging selection for Nimh 6V, 1200mAh similar to BQ24105