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DRV8848: Conflicting or missing information in datasheet.

Matthew Fritz
Prodigy 20 points
Part Number: DRV8848

When looking at the datasheet for DRV8848 I get the impression that the device can drive up to 2 amp per H-Bridge output. This is first specified under the features section of the first page. There are other locations in the datasheet that give me the impression that it is actually 1 amp per bridge -- specifically 1 amp RMS. Is this device able to output up to 2 amp per bridge or not?

The package is specified as HTSSOP, 16 pin. Where are the exact dimensions or recommended footprint? The first page specifies the length to be 5mm and the width at 6.4mm. This dimension is corroborated by the package tape dimmensions. However, the device drawing appears to reference PWP 16. When looking on TI's website for PWP 16 I see no mention of a width of 6.4mm and instead see 4.4mm. What should the dimmensions be? Is it 5mm by 4.4mm or not? What are the dimensions of the thermal pad?

  • 0
    TI__Guru** 114905 points
    Hi Matthew,

    The DRV8848 is capable of 2 amp per bridge, but there are conditions.

    As stated in the features "2-A Maximum Driver Current at 12 V and Ta=25C", the device can deliver 2A at 25C. If the ambient temperature is higher, the device cannot deliver 2A because the thermal shutdown could activate. Even the 1A RMS has a footnote stating "Power dissipation and thermal limits must be observed".

    In most conditions, the peak current is required to start a motor and then after the motor starts the current will be reduced.

    For more information, please see: www.ti.com/.../slva505.pdf

    Regarding the package and thermal pad information, the information has been accidentally dropped. I found the information you are looking for here: www.farnell.com/.../1861871.pdf By searching for the document number (SLLSEL7) and the original release date (October 2014), the document was found.

    The CAE/CAD layout and schematic are provided as a .bxl file that can be located here: www.ti.com/.../pinout-quality
    Scroll down to the CAD/CAE symbols section. The .bxl file is generic file that can be converted into many CAE/CAD programs.