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12v boost converter using LM27313

Mike Gimon
Prodigy 20 points
Other Parts Discussed in Thread: LM27313

Hello, I've been looking for a boost converter that has as low as possible quiescent current with an output of 12v and at least 0-200mA. I've come across the LM27313 and I need some help figuring out if it's a good fit for my design.

Using the 12v circuit on the first page of the datasheet under Typical Application Circuits can someone tell me if LM27313 is able to function with:

  1. Output voltage of 12v
  2. Input voltages ranging from 5v to 12v
  3. While supplying a ranging current of Zero to 200mA at least
  • 0
    TI__Mastermind 23845 points

    Hi Mike,

    I think the LM27313 should be able to meet your input and output voltage specification while delivering current up to 200mA.  You might need some circuit to shutdown the converter though if the input is less than 5V  in order to prevent input current to keep on increasing when your input is below 5V. 

    You can refer to this for the UVLO circuit. http://www.ti.com/lit/an/slva638b/slva638b.pdf

    Or you can have a power on reset circuit that pull the SHDN pin low when input is less than 5V. 

    Thanks

    -Arief

  • 0 in reply to Arief Hernadi
    Prodigy 20 points

    Do you happen to know of a similar boost converter that has lower quiescent current; that will also work for my criteria? 

  • 0 in reply to Mike Gimon
    TI__Mastermind 23845 points

    I think it depends how low you want to go. But to go with an even lower quiescent current i think you need to do some external circuitry added. One idea is to monitor the output voltage and you do some kind of hysteresis at the output. So you only turn on the switching when the output voltage is below a certain lower threshold and when it reaches a certain higher output level, you turn off the switching. 

    Therefore the frequency of the converter is not fixed. You only switch when you need to.

    Thanks

    -Arief