Optimized Improvement Method of Low Dropout Regulator Parallel Current-balanced Performance

Aiming at the wide use demand of parallel current balance of power products, this paper introduces the working principle of current sharing firstly, which is the key performance index of parallel application. Then combined with an example of poor parallel current sharing of a low dropout voltage linear regulator, the problem and mechanism are analyzed, the main factors affecting parallel current sharing are studied, and an optimization method is proposed. The current mirror circuit and layout of the device are redesigned by optimizing the internal feedback proportional coefficient of the device. The improved product is verified and tested by simulation. The results meet the design expectations and the uneven current sharing is effectively solved. The improved method is feasible and practical.