• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 284 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM2623: Does disabled boost converter supply power?

Zeki Caner Adiyaman
Prodigy 10 points
Part Number: LM2623

I am using LM2623MM boost converter in my circuit. As you can see from the datasheet when EN pin is pulled to ground, boost converter is disabled. I am thinking about supplying GPS and GSM module from this boost converter and I would like to cut off the power(for low power consumption) of them pulling EN to ground. My supply voltage of boost converter is 3.7V. As I researched when boost converter is disabled, output voltage becomes Vin-0.3V which makes 3.4V(not sure about that). Working voltage of GSM module is over 3.5V, GPS is over 3V. So does these components consume power, even if boost converter is disabled?

  • 0
    TI__Mastermind 34231 points
    Hi Zeki,

    Even though you pull EN pin down to ground, the boost converter output voltage will keep at Vin-voltage drop of diode. That's why you saw Vo becomes Vin-0.3V. As GPS module will keep working over 3V, I'd like to suggest you choose another boost converter with true disconnection feature, which means vout is zero if EN pin is pulled down to ground.
    Can you tell me the nominal output voltage of LM2623 and its maximum load current that two modules need?