LM3940

Vladimir Naumenkov

Other Parts Discussed in Thread: LM3940

Dear Sir

Please, answer, is it possible to feed 3.3V voltage at the output of the LM3940ISX-3.3, provided that input power supply is off?

TIA.

Sincerely,

Vladimir Naumenkov

www.agat.by

over 9 years ago

0 Bing Jing over 9 years ago

TI__Prodigy 80 points

Hello , Thanks for your question first.
In LM3940, there has a diode between Vout and Vin, the anode of diode is connected to Vout, the cathode is connected to Vin. When the Vout of LM3940 is hooked to 3.3V, if Vin Pin is floating, 3.3V supply should not be loaded down ; if Vin is connected to GND, i think 3.3V will be loaded down.
Any concern or question, please don't hesitage to let us know. Thanks.
Best regards Bing

0 Vladimir Naumenkov over 9 years ago in reply to Bing Jing

Expert 2970 points

Dear Mr. Jing!

Thank you

Sincerely

Vladimir Naumenkov

Power management

Power management forum

LM3940