This laser driver, ATLS4A217, is an electronic module that  has all the valuable and important, but often difficult to achieve                  simultaneously, features simultaneously: wide input  and output voltage range, high output current capability, high efficiency, low        output noise (but it has an output 4mVp-p ripple voltage at 700kHz), wide modulation bandwidth, and  small size. The wide output      voltage range, 0.2V_VPS ~ 0.8V_VPS, allows driving one or multiple serial laser diodes at the same  time, for up to 4A well controlled      current at high efficiency.