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TPS2540 and TPS2541 Difference?

Larissa Swanland
Expert 6915 points
Other Parts Discussed in Thread: TPS2541, TPS2540

Hello, I was hoping that somebody could help discuss the differences between the TPS2540 and the TPS2541.

Looking through the datasheet, there isn't an apparent difference that jumps out at me.

If a board is layed out for the TPS2540, would we be able to use the TPS2541 for supply line issues, and what re-design may be entailed?

 

  • 0
    TI__Guru 64480 points

    The Pin Descriptions section of the datasheet highlights the difference in the functionality of the EN/DSC control pin.

    Logic-level control input for turning the power switch and the signal switches on/off.
    TPS2540/40A: When EN is low, the device is disabled, the signal and power
    switches are OFF.
    TPS2541: When DSC is low, the device is disabled, the signal and power switches
    are OFF and the output (OUT) capacitor is discharged.

    Also the Output Discharge section discusses the difference.

     

    Output Discharge
    To allow a charging port to renegotiate current with a portable device, TPS2540/40A/41 uses the VBUS
    discharge function. It proceeds by turning off the power switch while discharging OUT, then turning back ON the
    power switch to reassert the OUT voltage.
    This discharge function is automatically applied when a change at the CTLx lines results in any of the following
    mode transitions.
    • Any transition to and from CDP
    • Any transition to and from SDP
    In addition to this, a direct discharge control, DSC, is available with the TPS2541, while with the TPS2540/40A, a
    discharge can be achieved using the mode “000”.