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BQ51003: Is it OK to leave the two RECT pins unconnected?

Robert OBrien
Prodigy 10 points
Part Number: BQ51003
Other Parts Discussed in Thread: TIDA-00318,

Is it OK to leave the two RECT pins unconnected?

The datasheet shows the two RECT pins connected together, but not connected to anything else on p. 34, 11.2 Layout Example.

But the pin description for RECT states: Filter capacitor for the internal synchronous rectifier. Connect a ceramic capacitor to PGND. Depending
on the power levels, the value may be 4.7 μF to 22 μF.

Also, bga pins Clamp1, Clamp2, FOD, & AD-EN are not connected to anything in this "Layout Example", which makes sense if they aren't needed for the design.

If the datasheet is correct, these unconnected pins would eliminate the need for "via in pad" pcb fabrication.

  • 0
    TI__Guru 73611 points

    Hi Robert

    "Is it OK to leave the two RECT pins unconnected?" -- They need to be connected; filter capacitors are required.

    "Also, bga pins Clamp1, Clamp2, FOD, & AD-EN are not connected to anything in this "Layout Example", which makes sense if they aren't needed for the design." -- The pins are needed  and components are needed and back of PCB has more connections.  Via in pad are used.

    The evaluation board (EVM) User Guide will have more info on layout, here.

    Also see TIDA-00318, this is a small form factor application of the BQ51003.