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LM2663: LM2663 SD pin connection

Dave Bender
Intellectual 620 points
Part Number: LM2663
Other Parts Discussed in Thread: LM2662

The LM2663 datasheet says the SD pin is connected to GND, but does that mean there must be an external GND connection?

The sample schematics in the datasheet do NOT show an external GND connection, except in the test circuit (pulled down by 1M resistor)

-Dave

  • 0
    TI__Guru* 78400 points

    Hi Dave,

    Thank  you for consider the LM2663.  Yes you external pull-down to operate the device.   Most figures in the datasheet apply to both LM2662 and LM2663, so the pin is left open.  However, in the Pin Functions table, it is clearly recommended to ground this pin for normal operation.

    Thanks,

    Youhao Xi,  Applications Engineering