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Need a 1.8V supply

Discussion in 'Power Electronics' started by Rajinder, Mar 25, 2019.

  1. Rajinder

    Rajinder

    351
    6
    Jan 30, 2016
    Hi,
    What is the best way to achieve a 1.8V supply? Can this be done with transistors only? I have 3V3 input need 5mA output.
    Thanks.
     
  2. dave9

    dave9

    672
    153
    Mar 5, 2017
    It would be easiest to get a precise output by just using an LDO, low dropout regulator. An old/common choice would be an LM1084.

    http://www.ti.com/lit/ds/symlink/lm1084.pdf

    It has a typical minimum load of 5mA and max of 10mA, so if it isn't stable at your 5mA load you might want to put a resistor between positive output and ground to give it 5mA more load, 10mA total... in this case the loss is negligible unless the device needs to run days at a time from small batteries.
     
    Ian likes this.
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