Li Ion battery charger

suriyanarayanan santhanam

Other Parts Discussed in Thread: BQ2954, BQ24610EVM, BQ24610, BQ24618

Hi,

i need to select a battery charger/controller for charging 24V Li Ion.

i checked BQ2594 datasheet. but its given its max output voltage is 21.6V

Can any one suggest which charger would be simple and efficient so that i can change the ref voltage based on the battery i choose.

-suriya

over 14 years ago

0 Matthew Day over 14 years ago

TI__Mastermind 36110 points

bq2594 is not a valid part number. I'm assuming you have 6 Li-Ion cells in series which means you need a max charging voltage of 6*4.2V = 25.2V. You will need to think about your electrical requirements and generate a list of parameters to help you select an appropriate charger. Once you have done this, you can use the selection tools on the TI website to narrow your search for a charging IC. Go to www.ti.com, click on Power Management, and then Battery Chargers. Can I ask what the application is and when you plan to go to production?

0 suriyanarayanan santhanam over 14 years ago in reply to Matthew Day

Intellectual 280 points

Hi,

I am using this for building smps. i used the selection tool and gave option for more than 5 cells. only bq2594 was shown.

can u suggest me some part numbers useful for this application.

-suriya

0 Wang5577 over 14 years ago in reply to suriyanarayanan santhanam

TI__Guru 56650 points

I am not sure we are looking at the same selection tool. The part number should be bq2954. if it is not bq2954, would you forward your bq2594 datasheet to me?

I would recommand bq24610 for this 5 cells application. Acturally, the bq24610EVM sets the output to 5-cell (21V).

0 suriyanarayanan santhanam over 14 years ago in reply to Wang5577

Intellectual 280 points

what about ucc3956? is it ok to use it to charge 24V battery because we are going to give the reference voltage as voltage divided by resistor

0 Matthew Day over 14 years ago in reply to suriyanarayanan santhanam

TI__Mastermind 36110 points

I do not suggest using the ucc3956 because it is a lead acid battery charger. I agree with Wang's answer that you shoud consider the bq24618. If you study the datasheet carefully, you will undersand how to use this IC to meet your specifications.

0 suriyanarayanan santhanam over 14 years ago in reply to Matthew Day

Intellectual 280 points

but in the datasheet of ucc3956 it is given it is a Li ion battery charger

0 Matthew Day over 14 years ago in reply to suriyanarayanan santhanam

TI__Mastermind 36110 points

Actually, you are correct. It is a Li-Ion charger. You are free to choose any charger that meets your requirements. If an EVM is available for the IC you choose, the quickest way to evaluate your design is to order the EVM and make the appropriate modifications.

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Li Ion battery charger