LDO & Switcher Parameters

Hi Alexander,

This is an open ended question, so the answer can technically be just about anything.

1. Size may be important for space constrained systems

2. Switching frequency of the switcher and the PSRR of the linear regulator may be critical to prevent interference with sensitive RF electronics

3. Efficiency of both the switcher and linear regulator may be important to reduce power loss

4. The converters may need to be designed so that they have low thermal resistance

5. The converters may need to be designed to prevent EMI

6. The converters should be able to handle the appropriate ESD requirements

7. The stability of the power converters depends on using passive components which have a long life span in demanding environmental conditions.  Cheap capacitors in particular are not an option.

I could go on, but you can see there are many factors which go into an LDO and switching converter.  You would start with the base requirements (environmental and operational), develop an architecture, then look at the mechanical constraints (height and PCB real estate) to fit it all in.

Thanks,

- Stephen

Thank you much for the response Steven! That was very helpful.