Electronic Design
Buck Controller Saves Space In HV Apps

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.

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