Thursday, 17 August 2017

batteries - How to regulate a 3.6 V battery to two power rails (3.3 V and 1.8 V)?



I have a 3.6 V battery from which I need two voltage rails, one that is 3.3 V and one that is 1.8 V. How should I design this circuit such that it is the most power efficient?


Here is what I was thinking:



  • Using one voltage regulator to regulate the 3.6 V down to 3.3 V, and using voltage division after the 3.3 V to create a 1.8 V

  • Using two voltage regulators to regulate the 3.6 V down to 3.3 V and 1.8 V


Are either of these good options? What else might you suggest?


Follow-up question about using two regulators: Should I put them in series or parallel?


i.e.


Series: Regulate 3.6 V down to 3.3 V, and then regulate this 3.3 V down to 1.8 V.



Parallel: Regulate 3.6 V down to 3.3 V, and separately regulate 3.6 V down to 1.8 V.


schematic


simulate this circuit – Schematic created using CircuitLab




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