Well this is the granddaddy with 3V of dropout. Not much rejection at
high frequency, but the design is old. Modern LDOs are better,
especially with P-fet pass device.
http://www.ti.com/lit/ds/symlink/lm317-n.pdf
On 2/27/2012 9:13 PM, Charles P. Steinmetz wrote:
Ed wrote:
So, for best HF noise performance where the input noise may be large,
it's best to use a follower or shunt regulator topology, despite the
lower efficiency - unless efficiency is more important.
To put it more bluntly, the last time I looked (it has been a while, so
there may be something new I haven't seen) LDOs were all substantially
inferior to standard regulators in terms of noise feedthrough and HF
load regulation. The rule of thumb has always been to avoid LDOs unless
low dropout was the paramount concern. Has something changed with
current LDO designs to make them competitive with standard regulators in
terms of noise feedthrough and HF load regulation?
Best regards,
Charles
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