Hi,
Is the output of Step-Up/Step-Down regulators generally stable enough to use as input power to micro-controllers (without any further linear regulator)?
Specifically, I’m thinking of using a Pololu Adjustable Step-Up/Step-Down Voltage Regulator S7V8A to power some 3.3V electronics including a Teensy 3.1 micro-controller and a MPU-9250 9-Axis IMU.
Would there be a general recommendation between:
[ol]
[li]Setting the regulator output at 3.3V and using directly (bypassing regulator in the micro-controller). [/li]
[li]Setting the regulator output at 3.7V and also using the linear regulator in the micro-controller to provide smoother power. (3.7V being the minimum it accepts). [/li][/ol]
As background, my circuit will likely have other power-line noise - the same battery will be powering a step-up regulator (to 8V) and running 2 Pololu micro-metal gear motors with PWM that are changing speed and direction - so I would like to take steps to reduce risk of noise affecting the micro-controller. (Will need to figure out what decoupling capacitors to use too).
Thanks,
Dan