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National Semiconductor Introduces Industry’s First High-Voltage, Monolithic Two-Switch Forward DC-DC Regulator

New Switch-Mode Regulator Features Ultra-Wide Input Voltage Range from 4.25V to 75V

Dec 17, 2007

December 17, 2007 - National Semiconductor Corporation (NYSE:NSM) today introduced the industry’s first high-voltage, monolithic two-switch forward DC-DC regulator for power supply designs in telecommunication, automotive and industrial applications.  The highly integrated LM5015 features an ultra-wide input voltage range from 4.25V to 75V and maximum switching frequency to 750 kHz.  The LM5015 enables easy implementation of either isolated or non-isolated DC-DC converters using a minimum of external components. 

Offered in a small TSSOP package, the LM5015 integrates two 75V N-Channel MOSFET switches for a reduced system component count and very small solution size.  The two-switch forward architecture reduces system losses and noise.  The LM5015 joins National’s high-voltage DC-DC regulator product line which includes the LM5001 and LM5002 high-voltage switch-mode regulators.

Key Features and Benefits
The LM5015 high-voltage switch-mode regulator features all of the functions necessary to implement efficient two-switch forward and two-switch flyback power converters with a minimum of external components.  The easy-to-use regulator integrates high-side and low-side 75V N-Channel MOSFETs with a minimum 1A peak current limit.  The voltage across the MOSFETs employed in the two-switch topology is clamped to the input voltage, allowing the input voltage range to approach the rating of the MOSFETs.  The regulator control method is based on current-mode control, providing inherent ease-of-loop compensation and line feed-forward for superior rejection of input transients.

The operating frequency of the LM5015 is set with a single resistor and is programmable up to 750 kHz.  The oscillator can also be synchronized to an external clock.  Additional protection features include cycle-by-cycle current limiting, thermal shutdown, under-voltage lockout and remote shutdown capability.  The LM5015 is offered in a 14-pin TSSOP package featuring an exposed die attach pad to enhance thermal dissipation.

For more information on the LM5015 or to order samples and an evaluation board, visit http://www.national.com/pf/LM/LM5015.html.

Packaging and Pricing
The LM5015 is available now and priced at $2.05 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
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About National’s Power Management Products
National solves power management design problems in space- and energy-constrained applications from feature-rich handheld devices through large line-powered systems. From the novice power designer to the power expert, National’s products, people and design tools enable customers to design green-powered systems with complex power supplies in the shortest amount of time. High-performance products include switching regulators such as National’s flagship SIMPLE SWITCHER® family, and application-specific products including white-LED drivers and Power-over-Ethernet controllers.  More information about National’s power management products is available at http://www.national.com/power
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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, interface products and data conversion solutions. National's key analog markets include wireless handsets, displays, communications infrastructure, medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $1.93 billion for fiscal 2007, which ended May 27, 2007. Additional company and product information is available at http://www.national.com
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