Switching Regulators have supply voltage rating up to 50 V.
April 29, 2008 -
Suited for handheld devices and automotive power adapters, Models LM34917A and LM34919 step-down regulators feature 1.25 A continuous output current, programmable switching frequency up to 2 MHz, intelligent current limiting, and over-voltage protection. Offered in 12-pin 2 x 2.3 mm micro SMD package, Model LM34917A supplies up to 1.25 A to load and contains N-Channel MOSFET buck switch. Supplying up to 0.6 A to load, Model LM34919 comes in 10-pin, 1.5 x 2 mm micro SMD package.
National Semiconductor Introduces Industry's Smallest Step-Down Switching Regulators for Handheld Devices and Automotive Power Adapters
PowerWise Buck Regulators Supply up to 1.2A and Feature Intelligent Current Limiting and Over-Voltage Protection
SANTA CLARA, Calif. - April 21, 2008 - National Semiconductor Corp. (NYSE:NSM) today announced two new step-down switching regulators well-suited for handheld devices and automotive power adapters. The highly integrated LM34917A and LM34919, members of National's PowerWise® energy-efficient product family, are the industry's smallest non-synchronous buck regulators to feature a supply voltage rating up to 50V, 1.25A continuous output current, intelligent current limiting and over-voltage protection.
National's new LM34917A and LM34919 feature programmable switching frequency up to 2 MHz. The products integrate MOSFET switches to reduce system component count, and a high switching frequency enables use of ultra-small inductors and capacitors for very small solution size.
The LM34917A and LM34919 utilize a constant on-time (COT) control scheme, which requires no loop compensation. The regulators are well-suited for use in applications that require high-input voltage regulations such as MP3 players utilizing Firewire connectivity (IEEE1394) as well as MP3 players or auxiliary power adapters with direct connection to a 12V (universal) automotive power outlet where transient protection requirements can exceed 40V.
The LM34917A and LM34919 feature peak efficiency equal to or greater than 90 percent, positioning it among National's PowerWise® family of energy-efficient products. The products feature ultra-small micro SMD packaging and extend National's buck regulator product line which includes the LM2694, LM34910 and LM34914 buck regulators offered in LLP® packaging.
Key Features and Benefits of the LM34917A and LM34919 Buck Regulators
The LM34917A and LM34919 step-down switching regulators feature all of the functions needed to implement a low-cost, efficient buck bias regulator.
The LM34917A buck regulator supplies up to 1.25A to the load. It contains an N-Channel MOSFET buck switch and is available in a 12-pin. 2 mm by 2.3 mm micro SMD package. In addition to no loop compensation, the COT feedback regulation scheme also results in fast load transient response and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant-current mode without foldback when the output is overloaded. Additional features include VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout and maximum duty cycle limiter.
The LM34919 buck regulator supplies up to 0.6A to the load and features the constant on-time feedback regulation scheme of the LM34917A. The LM34919 is offered in a 10-pin, 1.5 mm by 2 mm micro SMD package.
Packaging and Pricing
Available now, the LM34917A is priced at $1.35 each and the LM34919 is priced at $1.05 each. All prices are in 1,000-unit quantities.
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://power.national.com.
About National's PowerWise Brand
National's PowerWise brand reflects the company's energy-efficient product portfolio. It signifies products with outstanding performance-to-power at the component level, as well as products that provide an outstanding, energy-efficient solution when coupled with other National parts. National's PowerWise family of products features energy-efficient power management, operational amplifiers, interface and data conversion products. For more information about National's PowerWise brand, visit: http://www.national.com/powerwise.
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.
Company Name: National Semiconductor
Address 1: 3689 Kifer Road, M/S G1-124
City: Santa Clara
State: CA
Zip: 95051
Country: USA
Phone: 408-721-2033
Contact Name: Gayle Bullock
Title: Public Relations
E-mail: gayle.bullock@nsc.com
Contacts:
Marketing:
Gayle Bullock
USA E-mail this person Company Information: Name: National Semiconductor Corp. Address: 2900 Semiconductor Dr. City: Santa Clara State: CA ZIP: 95051-0695 Country: USA Phone: 800-272-9959 FAX: 408-739-9803 http://www.national.com
News provided by ThomasNet Industrial Newsroom® (TIN). TIN is a comprehensive source
of new and timely product information in the industrial marketplace. TIN supplies new product
information to the web sites, e-marketplaces and print publications that serve the
industrial marketplace. For press release submissions please go to
http://www.productnews.com/SubmitPRPage.html.
BY ACCESSING, BROWSING AND/OR USING THIS WEB SITE AND/OR ANY WEB SITES PROVIDED BY
ProductNews.com, YOU AGREE TO BE BOUND BY THE TERMS OF USE
AGREEMENT.
![[Get Copyright Permissions]](http://license.icopyright.net/images/icopy-w.gif){kind=small}
