EE Product News

National Semiconductor SIMPLE SWITCHER

The company has added six high-frequency buck regulators to its SIMPLE SWITCHER product family, along with a "dial-in" performance enhancement to its WEBENCH design environment. The regulators feature a combination of high performance, flexibility and ease-of-use for dc/dc power supply designs. NATIONAL SEMICONDUCTOR, Santa Clara, CA. (800) 272-9959.

WEBENCH Dial-In Enhancement
National's new buck regulators and enhanced WEBENCH suite of tools enable novice as well as seasoned power supply designers to easily "dial-in" their size and efficiency requirements while also realizing fast time to market. WEBENCH's online electrical and thermal simulations verify design results, and BuildIt! creates a custom prototype power supply kit for delivery within 24-48 hours.

The regulators operate with an input voltage range up to 75V and deliver up to 3A of continuous output current. The company's patented emulated-current-mode technology enhances load transient response in low duty cycle applications not addressable by traditional current mode control. Operating frequency is adjustable from 50 kHs to 1 MHz. To reduce EMI, a frequency synchronization pin is used so that multiple ICs from the family can self-synchronize to synchronize to an external clock. Other features are cycle-by-cycle current limit, short-circuit protection and thermal shut down. The 0.5A LM5574, 1.5A LM5575 and 3.0A LM5576 buck regulators feature an input voltage range from 6V to 75V and adjustable switching frequency from 50 kHz to 500 kHz. The 05.A LM25574, 1.5A 25575 and 3.0A LM25576 buck regulators feature an input voltage range from 6V to 42V and adjustable switching frequency from 50 kHz to 1 MHz. Click on Reader Service at

All six SIMPLE SWITCHER regulators are available now. Prices range from $1.35 to $2.90 each/1,000.

For more information on the regulators or to order samples and an evaluation board, visit:


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