I hate to be argumentative, but you can't be low drop out and use an emitter follower. Draw the circuit and convince yourself. You would need a high side driver scheme to drive the base/gate, and that require some sort of boost converter. It can be done on switchmode chips, but not in a linear circuit. Well unless you ship it with a battery.


On 2/27/2012 9:51 PM, David wrote:
The highest performance low dropout regulators I have seen use
emitter/source followers with a low current bias supply.


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