The ISL8003x is a 3 A compact synchronous buck regulator in an eight lead 2 mm x 2 mm DFN package. It can support an input range from 2.7 to 5.5 V. The devices focus on high-efficiency step-down conversion over a wide output current range, with up to 95% peak efficiency. The switching frequency is set at 1 MHz (ISL80030, ISL80031) or 2 MHz ( ISL80030A, ISL80031A). The mode is selectable between PWM (ISL80030, ISL80030A) or PFM (ISL80031, ISL80031A). The PFM feature significantly increases the efficiency at light load. The ISL8003x has both positive and negative over current, short circuit, thermal, and UVLO protections.