Hi, No, I think it should work. The VI = VO(typ) + 1 V condition is only > listed in the datasheet as the point at which some parameters of the > device were characterized, but not as a requirement. > > The document "Technical review of low dropout voltage regulator > operation and performance" by Texas Instruments [1] defines the dropout > voltage as: > "the input-to-output differential voltage at which the circuit ceases > to regulate against further reductions in input voltage; this point > occurs when the input voltage approaches the output voltage." > > Nice link.
> Then the datasheet of the TPS76301 lists a typical dropout voltage of > 300mV at 150mA (the LM4550 has a quiescent current of only 53mA) which > is, I think, far enough from the 4.75V-4.3V = 450mV worst case so we > don't have to worry too much about this. > > Ok, I just wanted it to be all in the typical design value for the best. > Anyway, to be 100% safe - let's add a 0 ohm resistor placeholder between > the regulator's input and output. The board works without the extra > regulation (only with a noticeable white noise in the line output) and > this way we can easily bypass it if it is a source of more serious > problems. > > Ok, I'll add it. -- Adam
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