TI Home > News Releases

News Releases

National Semiconductor Introduces Lowest Noise Linear Regulator in New LLP Packaging

CMOS Linear Regulator Provides World’s Lowest Output Noise with Fewest Components while Consuming Minimal Quiescent Current

Aug 16, 2006

August 16, 2006 – National Semiconductor Corporation (NYSE:NSM), the worldwide leader in power management technology, today announced availability of its popular 100 mA low drop-out CMOS linear regulator in new LLP® packaging.  The LP5900SD produces the lowest output noise in the industry and features high power supply ripple rejection, while consuming a mere 25 µA of quiescent current.  The LP5900SD is optimized for powering analog and RF signal-path integrated circuits (ICs), including low-noise amplifiers, voltage-controlled oscillators, RF receivers, image sensors and displays.

Using a patent-pending design, the LP5900SD emits a very low 6.5 µVRMS of noise without an external bypass capacitor.  Similar, competing products emit five times or more noise with an external bypass capacitor.  The LP5900SD also features a high power supply rejection ratio (PSRR) of 85 dB.  The ultra-low self-generated noise along with high PSRR make the LP5900SD the best choice for powering sensitive analog and RF loads.

In addition to micro SMD packaging, the LP5900SD is now available in a small, six-lead LLP package that measures 2.20 mm by 2.50 mm by 0.8 mm.  The LP5900SD is stable with just 0.47 μF of input and output capacitance, enabling the use of two very tiny ceramic chip capacitors.  The combination of small package footprint, no bypass capacitor and two tiny ceramic chip capacitors minimize the board space required by the LP5900SD and reduce the bill of materials.

Key Technical Specifications of National’s LP5900SD Linear Regulator:

  • World’s lowest 6.5 uVrms of noise combined with 85 dB of PSRR improves and ensures signal integrity
  • Very low 25 µA of quiescent current extends battery life in portable devices
  • Very low 80 mV dropout improves system efficiency by enabling regulation from the lowest possible voltage source
  • ±2 percent output voltage accuracy over full line/load/temp, guarantees maximum performance of the signal-path device being powered
  • Lead-free 6-lead LLP package and two 0.47 µF ceramic capacitors provide a small form factor and reduced bill of materials

The LP5900SD is available in multiple output voltages ranging from 1.5V to 3.3V, including 1.5V, 1.8V, 2.0V, 2.2V, 2.5V, 2.7V, 2.8V, 3.0V and 3.3V.  Other voltage options are available by contacting a National Semiconductor sales office.

For more information on the LP5900SD or to order samples, visit http://www.national.com/pf/LP/LP5900.html.

About National’s Power Management Products
National Semiconductor is the number one supplier of power management ICs with 14.1 percent market share, according to iSuppli’s 2005 voltage regulator/reference survey.  National’s power management revenue grew 37.3 percent in 2004 over the previous year, compared to 24 percent growth for the industry.  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, the LP5900SD linear regulator is priced at 55 cents in 1,000-unit quantities.

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high performance 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 $2.16 billion for fiscal 2006, which ended May 28, 2006.  Additional company and product information is available at www.national.com