The AP2006 series are monolithic IC's containing a PWM and a linear power controller. The PWM driving a external PMOS. Due to the reduced the number of external components, board space can be saved easily. The external shutdown function can be controlled by logic level and switching the IC into standby mode. The internal compensation provides a good line and load regulation without external components. Regard the protecting functions: Short circuit protect is against over current in the output switch. The AP2006 series operates at a switching frequency of 250KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +3% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The linear controller is able to drive an external NPN transistor, which a current limit set to 30mA pre-driver of AP2006 series. The ICs are available in a standard SOP8/DIP8 package for AP2006.