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Buck-Boost Controllers Accept Wide Input Voltage

Fri, 06/20/2008 - 10:39am

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LM5118 emulated current-mode-controlled buck-boost regulatorAccepting 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.

National Semiconductor
800-272-9959, www.national.com  

For more information on the LM5118 or to order an evaluation board, visit http://www.national.com/pf/LM/LM5118.html.

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