BQ24745 - is it really limited to 19V battery max ?

roman manka

Other Parts Discussed in Thread: BQ24610

Can this charger be used to charge 24V battery packs ?, looks like the input power source can go up to 30V, but smbus commands are only up to 19V. Is there a safe way to modify voltage feedback and shift the charger range higher then 19V?

over 14 years ago

0 Wang5577 over 14 years ago

TI__Guru 56650 points

The maximum recommended input voltage is 24V. So, please keep the input voltage lower than that. 19V output is good for a notebook application.

If you have another applicaion, we have higher ouput voltage charger, such as bq246xx. What are the input and output voltage range?

0 roman manka over 14 years ago in reply to Wang5577

Prodigy 40 points

Unfortunately non of them has SMbus logic built in, so I can not use them. I will have to make my own

Thanks,

0 Wang5577 over 14 years ago in reply to roman manka

TI__Guru 56650 points

I am not sure how do you build your board? But, there is a high voltage charger post. http://e2e.ti.com/support/power_management/battery_management/f/179/p/88984/307999.aspx#307999

Also, another idea is:

Convert InputCurrent(); chargeCurrent() and ChaargeVoltage() command to analog signals to setup bq24610 's ACSET; ISET1 and VFB resistor divider.

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BQ24745 - is it really limited to 19V battery max ?