The AIC1577 is a current mode switching regulator controller that drives external Nchannel power MOSFET using a fixed frequency architecure. It uses external divider to adjust output voltage from 0.8V to 20V with excellent line and load regulation. A maximum high duty cycle limit of 95% provides low dropout operation which extends operating time in battery-operated systems. Switching frequency up to 500KHz are achievable thus allowing smaller sized filter components. The operating current level is user-programmable via an external current sense resistor. It also provide output overvolt-