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TPS65218D0: Operating TPS65218D0 PMIC directly from single cell battery supply (3.0 to 4.2V), whether this is tested on AM437x EVM or not?

Part Number: TPS65218D0
Other Parts Discussed in Thread: TMDSEVM437X, BQ25890H, BQ25890SW-LINUX, , BQ25898, BQ27XXXSW-LINUX, TPS65218

Hi

The TPS65218D0RSLR PMIC does have one buck-boost converter inside it (DC-DC 4) which can generate 3.3V output even when the input supply is less than 3.3V.  Knowing this, we were planning to supply the PMIC directly from the single cell battery power which would range from 3.0V to 4.2V.

 Can you please confirm if AM437x EVM platform is tested with single cell battery supply directly provided to the PMIC?

Regards,

Yaseen

  • Yaseen,

    If you refer to the AM437x General Purpose EVM (TMDSEVM437X) and download the schematic, you will see that there is a "Battery Board Connector" on page 4, which is an optional input to the PMIC.

    The battery charger BQ25890H is a single-cell Li-Ion battery charger with a Linux driver (BQ25890SW-LINUX), and although there is no I2C (SCL, SDA) on the "Battery Board Connector" it could easily be added in your design. I can confirm that the BQ25898 battery charger was used in a design with TPS65218D0 and AM437x. It is likely the BQ25898 is also supported by the BQ25890H Linux driver, or it is suitable to operate in stand-alone mode (without I2C communication).

    Note that there is an HDQ pin listed on the "Battery Board Connector" pinout, which indicates this board also used a Fuel Gauge. Referring to the BQ27XXXSW-LINUX, it lists the following devices that also contain an HDQ pin. The design I was referring to previously that uses BQ25898 was a Mobile EPOS system (http://www.ti.com/solution/mobile-pos), and the fuel gauge listed here is BQ27452-G1 which has an HDQ pin for 1-wire communication.

    In summary, the answer to your question is: Yes, the TPS65218D0 has been tested and used in a product with a battery charger. The BQ25898 is one option for the battery charger, and the BQ27452-G1 is an option to use as a fuel-gauge. You can build your own PCB to test on the TMDSEVM437X evaluation board if you are interested, but I cannot find any released PCB that matches the required pinout.

    Note that the older TPS65218 (-B1) device was used on this EVM, which is NRND and should be replaced by the TPS65218D0.