Voltage regulator with improved load regulation using adaptive biasing

摘要

A low drop out voltage regulator ( 10 ) that receives an input voltage and generates a substantially constant output voltage includes a gain stage ( 12 ), a buffer stage ( 14 ), an output driver transistor ( 16 ), and first and second load current sense circuits ( 18, 20 ). The first load current sense circuit is connected between the output driver transistor and the buffer stage and adaptively increases a bias current of the buffer stage as a function of the load current. The second load current sense circuit is connected between the output driver transistor and the gain stage and adaptively decreases a bias current of the gain stage as the load current increases.