Dropout voltage for on-chip regulator?

Genesis

Is there a published spec for it?· I didn't find it in the docs....

If it matters the·stamp is a·BS2pe.....

Thanks in advance!
·

PJAllen

There's a whole page on specs, comparing the entire Parallax product line, "Voltage Requirements" included --

http://www.parallax.com/html_pages/tech/faqs/stamp_specs.asp

Genesis

The on-chip dropout voltage spec isn't in there.... (already looked)

Bean

Dropout voltage usually changes with current draw. You could just connect a variable power supply and measure the regulated voltage to determine it.
Bean.

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·

PJAllen

Loss of regulation at appx. 5.4V (will likely continue to pass V_IN as applied.)

http://www.linear.com/pc/downloadDocument.do?navId=H0,C3,P1370,D2188

It's the "1121", the 8pin SOIC beside pins 20, 21.

·

Post Edited (PJ Allen) : 12/25/2005 1:44:30 AM GMT

Genesis

Cool, thank you.

That helps a lot - its right near where my offboard regulator loses regulation, so I can keep operating down to 5.75VDC with reasonable safety.... (I have the ability to sense this on the peripheral side with a voltage divider into an ADC which the BS2 application reads.)