Buck-Boost Controllers Accept Wide Input Voltage
Accepting an input from 3 to 75 V, the LM5118 emulated current-mode-controlled buck-boost DC/DC regulator controller from National Semiconductor well-suited for battery-powered applications where the operating voltage can vary significantly. Delivering up to 10 A, the device includes features such as a shutdown current mode, a peak efficiency of 95%, and a programmable switching frequency up to 500 kHz. The controller includes drivers for the high-side buck MOSFET and the low-side boost MOSFET. The emulated current-mode control reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high-input voltage applications. Additional protection features include current limit, thermal shutdown and an enable input. Priced at $2.92 each in 1,000-unit quantities.
For more information on the LM5118 or to order an evaluation board, visit http://www.national.com/pf/LM/LM5118.html.