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LM7301 output voltage higher than V+, any problem?

Other Parts Discussed in Thread: LM7301

Hi,

LM7301, V+ = 3.1V, output is pulled up by 2.2k resistor to 5V. Any issue in long run?

Thanks.

- YY

  • Hello Yee,

    Will the LM7301 still have the 3.3V supply applied? Or are you thinking of a V+ power-down condition (V+ around 0V with output thru 2.2K to 5V)?.

    Max current with the supply off would be 5V/2.2k= 2.3mA. That is a little higher than we generally recommend (<1mA), but below the 20mA Abs Max.

    Note that this will affect the lower output swing (~200mV to rail) as the LM7301 will have to continuously sink 2.3mA (plus any load and feedback resistor current) when swinging low. The LM7301 will be biased into a class A mode and continuously sinking. The LM7301 is a low power amp, and the 2mA is using up about 20% of the available output drive.

    It should not harm it, but I would place a Schottky clamp diode from the output to the V+ supply to shunt the current around the internal clamp diodes should the V+ supply drop with the 5V still applied.

    Regards,