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BQ24075 questions

Clay Shoup
Intellectual 410 points
Other Parts Discussed in Thread: BQ24075T, TPS63000, TPS63020

I was looking at the BQ24075T for an application.  It is very close to my needs but for a couple of things.  I would like to know if this is the best option.

Requirements;

Single cell LiIon battery to be charged from USB (no AC power pak), Need to be able to select 100ma or 500ma current limit.  Need to drrive system voltage at USB current levels while charging.  System votlage requirements are; 4.9V to 5.2V. can the output voltage be adjusted.

I also would like to include a Fuel Cell function.  Is there an integrated charger + power path managment + fuel cell?

Thanks,

  • 0
    TI__Mastermind 36110 points

    If you must drive the system voltage at 4.9V to 5.2V while charging, use the bq24075T is the correct IC. This IC tries to set the system voltage to 5.5V, which means a USB input voltage will be passed directly through to the output voltage.  Please note that when the USB input is removed, the system voltage will drop to the battery voltage. This means your system should be designed to operate from your minimum battery voltage to the maximum USB input voltage.  TI buck-boost converters (TPS63000, TPS63020, etc) will operate as a buck or a boost converter and generate the proper output voltage from the lowest battery voltage and the highest USB voltage.  We do not have a product with build in Fuel Cell (gas gauge) product.  Note there is a separate forum for gas gauges.