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BQ24250: How to start with the BQ24250?

ANDREW GENG
Prodigy 160 points
Part Number: BQ24250
Other Parts Discussed in Thread: BQ25895

if you guys could help me with getting started with the 

bq24250 power bank IC.

My understanding is that this IC requires a host such a computer to set crucial parameters such as output voltage, output current etc.. 

What adapter/communicator would i need to use this IC?

The datasheet suggest that this device is able to run on standalone mode, if i wish to activate that mode how may I do so?

Once the parameters have been set to the IC, would the host need to be continuously connected to the IC as it operates? Or its just a single time thing, until parameters needs to be changed. 

Thank you so much! 

Any more tips/ resources would be greatly appreciated!

  • 0
    TI__Guru**** 167196 points
    Hi Andrew,

    Can you provide the following for your powerbank design:
    1. 5.xV / XA power output
    2. Input voltage and current available to re-charge the battery
    3. Boost converter that you plan to use to generate the 5.xV power bank output as the bq24250 does not have OTG boost mode.

    You might consider bq25895 as it was designed specifically for powerbank applications.

    Regarding your bq24250 questions,
    1. If you using a TI EVM for prototyping, the EVM software uses TI's USBTOGPIO adapter (www.ti.com/.../usb-to-gpio)
    2. The bq24250 defaults into standalone mode with the EN1/EN2 controlling input current limit and the external resistors setting input current limit, charge current and VINDPM.
    3. The charger has a watchdog timer that would need to be disabled in order for the charger to retain values other than default in the registers. There are certain fault conditions that will reset the registers to default values.
  • 0 in reply to Jeff F
    Prodigy 160 points

    Hi Jeff,

    Thank you! and sorry for the long overdue reply, My power bank operates at 5v 1A, charging current into the battery is 1A lithium ion. The charger is specifically for the lightening connector on iphones, thus having a USB output is not important.