• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 62 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

Original question:

LM4040-N: [ELENTEC] Design inquiry when using LM4040AIM3X-3.0/NOPB

LM4040-N: Query regarding the source voltage for shunt regulator

Vishnu Jayaraj
Prodigy 160 points
Part Number: LM4040-N

Hi,

The input voltage is 3.3V and trying to generate a 3V reference voltage for MC Vref.

Our 3.3V voltage range can vary +-5% that is from 3.135V to 3.465V.

Is it possible to use LM4040BIM3X-3.0/NOPB part for our application?

Regards

Vishnu

  • 0
    TI__Expert 6600 points

    Hello Vishnu,

    The LM4040BIM3X-3.0/NOPB will work in your application depending on the load current required. The LM4040BIM3X-3.0/NOPB requires a minimum operating current of Iq=67uA and has a max output current of 15mA. Rs must be selected so that (3.135V-3V)/Rs >= 67uA + IL and (3.465V-3V)/Rs =< 15mA. This gives a minimum resistance value of 31 ohms which means when Vs = 3.135V the maximum load current possible is 4.28mA with a 31 ohm input resistor. If less load current is needed, a larger resistor can be used up to 2k ohms when IL=0. 

    Best,

    Walter