The APW7120 is a fixed 300kHz frequency, voltage mode, and synchronous PWM controller. The device drives two low cost N-channel MOSFETs and is designed to work with single 5~12V or two supply voltage(s), providing excellent regulation for load transients. The APW7120 integrates controls, monitoring, and protection functions into a single 8-pin package to provide a low cost and perfect power solution. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. An internal 0.8V reference provides low output voltage down to 0.8V for further applications.An built-in digital soft-start with fixed soft-start interval prevents the output voltage from overshoot as well as limits the input current. The controller’s over-current protection monitors the output current by using the voltage drop across the low-side MOSFET’s RDS(ON), eliminating the need of a current sensing resistor. Additional under voltage and over voltage protections monitor the voltage on FB pin for short-circuit and over-voltage protections. The over-current protection cycles the soft-start function until 4 over-current events are counted. Pulling and holding the voltage on OCSET pin below 0.15V with an open drain device shuts down the controller.