Hi There!
I am, for several reasons about building a adjustable LDO. Some of the specifications are:
- min input voltage 4.4V
- max output voltage 3.6V
- 500mV dropout, due to sense resistor
- wide current output range
- at least 20kHz bandwidth @ 10uA load, ideally 100kHz
Pass element shall be a PMOS, not only due to the low dropout, but I need to separate the ground currents from the sensing element.
Performance/stability at light loads is the key aspect for the application.
I have sketched a discrete solution with a bunch of transistors, which is working in simulations, but is quite stuffy and its outcome uncertain when the parasitics of a real pcb add upp, heat generated on pcb. I also doubt the real bandwidth of the transistor models I found for the matched pairs.
So I would like to select an IC as EA.
What I am looking for is a wide band, mid-range gain amplifier. From the gain-loop analysis I have been simulating, I see I need the dominant pole of the EA to be at least 10kHz to avoid relative stability, given the desired bandwidth.
Any parts in mind?
I am, for several reasons about building a adjustable LDO. Some of the specifications are:
- min input voltage 4.4V
- max output voltage 3.6V
- 500mV dropout, due to sense resistor
- wide current output range
- at least 20kHz bandwidth @ 10uA load, ideally 100kHz
Pass element shall be a PMOS, not only due to the low dropout, but I need to separate the ground currents from the sensing element.
Performance/stability at light loads is the key aspect for the application.
I have sketched a discrete solution with a bunch of transistors, which is working in simulations, but is quite stuffy and its outcome uncertain when the parasitics of a real pcb add upp, heat generated on pcb. I also doubt the real bandwidth of the transistor models I found for the matched pairs.
So I would like to select an IC as EA.
What I am looking for is a wide band, mid-range gain amplifier. From the gain-loop analysis I have been simulating, I see I need the dominant pole of the EA to be at least 10kHz to avoid relative stability, given the desired bandwidth.
Any parts in mind?