Stabilizing output voltage

Discussion in 'General Electronics Chat' started by Dritech, Feb 16, 2016.

  1. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Hi all,

    I want to operate a circuit using a 3.7V battery. The circuit will contain op-amps, reference ICs and an ADC. How can I stabilize the battery voltage with maximum efficiency so that the reference ICs and ADC will not be effected?

    I was considering using the MAX682 charge pump IC which will keep an output voltage of 5V for an input of 2.7V to 5.5V. I was also considering using the MAX868 inverting charge pump IC since I also need negative rail for the op-amps.

    My concern is that these are not be best option for a battery operating circuit which needs to have low power consumption.

    Are there any other efficient option for this problem?
     
  2. paulktreg

    Distinguished Member

    Jun 2, 2008
    611
    120
    What's the current consumption of your circuit and how long do you expect the battery to run it for?

    How about powering your circuit from a 3.3V LDO regulator?
     
  3. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Thanks for the reply. I am still designing the circuit, but it will consume around 4mA.
    The problem with voltage regulators is that when the battery voltage drops to 3.3V (or even more), the circuit will not operate correctly.
    When using the charge pump, the circuit should still operate even when the voltage drops down to 2.7V.
    I never using charge pumps ICs ... are they inefficient for battery powered circuit after all?
     
  4. paulktreg

    Distinguished Member

    Jun 2, 2008
    611
    120
    Try both and see which suits your application best?
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,004
    3,232
    Charge pumps are generally not as efficient as switching regulators.
     
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