MAX688 - High-Accuracy / Low-Dropout Linear Regulators
The MAX687/MAX688/MAX689 low-dropout linear regulators operate with an input-to-output voltage differential limited only by an external PNP transistor.
Outputs are fixed at 3.3V (MAX687/MAX688) or 3.0V (MAX689).
The only external components required are a PNP pass transistor and output, compensation