Buck Controller Saves Space In HV Apps

Eliminating intermediate bus and second conversion stages to pare down PCB footprints by as much as 50%, the LM5119 high-voltage, dual-channel dual-phase synchronous buck controller with emulated current-mode control enables regulation of single or dual high-current voltages directly from inputs as high as 65V. Proprietary ECM control technology enables precise control of the small duty cycles necessary in high voltage applications. For high-current output requirements, the two outputs can interface in parallel to power loads up to 40A with interleaved switching. Other features include an operating voltage range from 5.5V to 65V, a 0.8V 1.5% reference, user-programmable operating frequency from 50 kHz up to 750 kHz, diode emulation mode that enables discontinuous inductor current operation at light load conditions, multi-phase operation, and programmable soft start. Available in a 32-pin, 5 mm x 5 mm LLP, price for the LM5119 is $4.05 each/1,000. NATIONAL SEMICONDUCTOR CORP., Santa Clara, CA. (800) 272-9959.