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My TPS62802 generates +3.3VDC output from a USB +5VDC input. I would like to have the DC/DC converter shut down once its input drops below a certain voltage (let's say ~ +4V), to avoid unexpected operation. Currently, regulation is maintained down to fairly low voltages, so I would like to modify at the EN-pin in order to accomplish this. However, this IC includes a sometimes-present 500k pull-down resistor as part of its "Smart enable" function. And further, this IC appears to be a somewhat "loose EN-pin threshold voltage" class device (non precise EN-pin) so I'm not sure a resistor divider is appropriate - is there a preferred/suggested way to adjust the EN-pin threshold? SVS?
Hi Fred,
I don't think a resistor divider will work here because of the wide enable pin threshold voltages and the VIN range you want to operate at. An SVS will be required to detect the 4V and turn the EN off.
Best regards,
Varun