The ADP3089 is a high frequency, PWM step-down switching regulator capable of 1.5 A switching current in a CSP-8L 3x3 package. It provides high efficiency, excellent dynamic response, and is very simple to use. The high switching frequency allows for small, inexpensive external components, and the current mode control loop is simple to compensate. It operates in PWM current mode under heavy loads, and saves energy at lighter loads by switching automatically into hysteretic mode. Soft start is integrated completely on chip, as are the cycle-by-cycle current limit and the power switch.