How close to drop out voltage can one operate an LDO in order to squeeze the last ounce out of my circuits efficiency?

Question How close to drop out voltage can one operate an LDO in order to squeeze the last ounce out of my circuits efficiency? Answer The minimum headroom required is highly dependent on the LDO characteristics, load current, and the use case. For instance, if rejecting noise that appears on the input to the LDO is important, the minimum headroom will probably be several hundred to 500mV or even more. If on the other hand PSRR of the LDO is not a consideration, then theoretically, the LDO may be operated with only a few millivolts of headroom. In practice however, unless the operating current is very low, at least 100mV to 200mV will likely be required to accommodate the tolerances of the source voltage and the LDO output voltage.

How is the RMS output noise of a low noise LDO measured?

Question How is the RMS output noise of a low noise LDO measured? Answer The noise test measurement system allows the user to integrate the noise spectral density data over the desired bandwidth to calculate the RMS noise.

How is the output noise spectral density of a low noise LDO measured?

Question How is the output noise spectral density of a low noise LDO measured? Answer Noise measurement equipment such as the Agilent E5505A or E5052B forms the basis of the noise test fixture

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ADP7182 Recommended for New Designs
The ADP7182 is a CMOS, low dropout (LDO) linear regulator that operates from âˆ’2.7 V to âˆ’28 V and provides up to âˆ’200 mA of output current. This high...
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ADP7182 on Analog.com