BQ25171-Q1: LTO Cell Application

Robert Schwiertz

Prodigy 50 points

Part Number: BQ25171-Q1

Dear TI Team,

can this device support the LTO Cells with 2.8V/Cell? Shall be the resistor-value on VSET adjust on this application?

Kind regards R.Schwiertz

over 2 years ago

0 Nick Brylski over 2 years ago

TI__Mastermind 19195 points

Hello Robert,

The lowest regulation voltage bq25171-q1 can support is 3.5V/cell for LiFePO4. The allowed resistor values / voltages are those given in table 7-2 of d/s.

Best regards,

Nick

0 Robert Schwiertz over 2 years ago in reply to Nick Brylski

Prodigy 50 points

But two LTO Cells in series can be charged or not?

0 Nick Brylski over 2 years ago in reply to Robert Schwiertz

TI__Mastermind 19195 points

Hi Robert,

Do you have battery specification we can look at? Two cells in series this would be 5.6V which is also not supported by bq25171-q1.

Thanks,

Nick

0 Robert Schwiertz over 2 years ago in reply to Nick Brylski

Prodigy 50 points

Dear Nick,

here is the specification of the battery which I am looking for.

As I said. It is an LTO cell with a capacity 3000mAh. I want to charge it with C/10.

0 Nick Brylski over 2 years ago in reply to Robert Schwiertz

TI__Mastermind 19195 points

Hello Robert,

Unfortunately we do not have a solution for this currently.

Best regards,

Nick

0 Nick Brylski over 2 years ago in reply to Nick Brylski

TI__Mastermind 19195 points

You may check out a discrete solution similar to the one proposed here: https://www.ti.com/lit/an/slyt333/slyt333.pdf

BR,

Nick

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BQ25171-Q1: LTO Cell Application