The LM5005 high-frequency buck regulator steps down an input voltage from 7 to 75V to produce a regulated 2.5-A power supply, adjustable from 1.225 to 65V. Reliable and compact, the device is optimised for 48-V telecom, automotive and industrial powersupply applications. It integrates a 75-V N-channel MOSFET and employs a proprietary scheme that uses emulated, current-mode pulse-width modulation to produce a 2.5-A step-down regulator with minimal external components. This proprietary control method generates an internal emulated inductor current ramp that significantly reduces the noise sensitivity of the controller. It allows the device to reliably control very small duty cycles so designers can take full advantage of the 500-kHz frequency capability. Moreover, current-mode control provides inherent line voltage feed-forward and simplified loop compensation.