The LM3487 is a high-side N-channel MOSFET switching regulator controller. It can be used in topologies requiring a high side MOSFET such as buck, inverting (buck-boost) and zeta regulators. The LM3487's internal push pull driver allows compatibility with a wide range of MOSFETs. A wide input voltage range and an adjustable current limit allow the LM3487 to be optimized for a wide variety of applications. The LM3487 has an adjustable switching frequency which can also be synchronized to an external clock. Current-mode control requires only a single resistor and capacitor for frequency compensation. The current mode architecture also yields superior line and load regulation and cycle-by-cycle current limiting. A 7A shutdown state can be used for power savings and for power supply sequencing. Other features include external soft-start to reduce inrush current and output over voltage protection.