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National Semiconductor Introduces 1 MHz Synchronous Buck Switching Controller for Powering Loads up to 10A

Ultra-Small LM3743’s Protection Features and Programmable Tracking Reduce External Circuitry, Increase Fault-Tolerant Performance in High-End, Space-Constrained Applications

Sep 25, 2006

September 25, 2006 - National Semiconductor Corporation (NYSE:NSM), a worldwide leader in power management technology, today introduced a 1 MHz synchronous buck switching controller in an ultra-small MSOP package that is optimized for powering loads up to 10A.  The robust LM3743, which requires minimal external circuitry for a smaller overall footprint, also has programmable tracking and extensive protection features which make the controller well-suited for space-constrained designs in communications, high-end consumer, computing and industrial applications.

Technical Features of National’s LM3743
The LM3743 voltage-mode PWM buck controller operates over the input range of 3V to 5.5V and drives external synchronous MOSFETs at either 300 KHz or 1 MHz, which generates output voltages as low as 0.8V.  It features an externally programmable soft start with tracking capability and external compensation.  The LM3743 has an externally programmable current limit with low-side MOSFET current sensing that is plus or minus 15 percent accurate, as well as a hiccup mode of operation, which means that engineers do not need to over-design external components.  Additional protection features include under-voltage lockout and a fixed short-circuit, high-side current limit.  Reference accuracy is plus or minus 1.75 percent over the whole operating temperature range of -40 degrees C to +125 degrees C.  The LM3743 is offered in a tiny 10-pin mini SOIC package.

For more information on the LM3743 or to order samples, visit http://www.national.com/pf/LM/LM3743.html.

About National’s Power Management Products 
National Semiconductor is the number one supplier of voltage regulator ICs with 14 percent market share, according to iSuppli’s 2005 Semiconductor Market Share survey.  National's innovative power management products include best-in-class linear regulators; power monitoring, control and reference ICs; and switching converters, such as high-voltage ICs for DC-DC conversion, switched capacitor converters, lighting management ICs and inductive switching converters.  National also offers online tools that enable power designers to select the best power management chips for their applications.  National's Webench® design tool allows designers to choose a product, create and analyze a design, and then build custom prototypes that can be delivered within 24 hours. More information about National’s power management products is available at

Pricing and Availability
Available now, National’s LM3743 is priced at $1.20 each in 1,000-unit quantities.

Note to Editors:  To view a high-resolution downloadable photo of this product, visit National's photo gallery at http://www.national.com/company/pressroom/gallery/power.html.

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high-value analog devices and subsystems.  National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, communication interface products and data conversion solutions.  National's key analog markets include wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial, and test and measurement applications.  Headquartered in Santa Clara, California, National reported sales of $1.91 billion for fiscal 2005, which ended May 29, 2005.  Additional company and product information is available at www.national.com