The AX3001 series are monolithic IC designed for a step-down DC/DC converter,and own the ability of driving a 2A load without additional transistor. It saves boardspace. The external shutdown function can be controlled by logic level and then comeinto standby mode. The internal compensation makes feedback control having goodline and load regulation without external design. Regarding protected function,thermal shutdown is to prevent over temperature operating from damage, and currentlimit is against over current operating of the output switch. If current limit functionoccurs and VFB is down below 0.5V, the switching frequency will be reduced. TheAX3001 series operates at a switching frequency of 150KHz thus allow smaller sizedfilter components than what would be needed with lower frequency switchingregulators. The output version included fixed 3.3V, 5V, 12V, and an adjustable type.The chips are available in a standard 8-lead SOP package.