National Semiconductor Expands Precision Line With Three High Common-Mode Difference Amplifiers

National's LMP8270, LMP8271 and LMP8272 Precision Amplifiers Redefine Accuracy in Current Sensing Applications

SANTA CLARA, Calif., Dec. 13 /PRNewswire-FirstCall/ -- National Semiconductor Corporation (NYSE: NSM) today expanded its high-performance precision amplifier portfolio with the addition of three high common-mode difference amplifiers. Designed for broad-based industrial, commercial and automotive applications, these new amplifiers meet the requirements for accurate current sensing measurements in products such as battery charging and discharging for notebook computers and cell phones, and fuel injection control.

The LMP8270 and LMP8272 high common-mode amplifiers and LMP8271 high common-mode bidirectional amplifier join National's LMP(TM) (linear monolithic precision) product family targeting the precision market.

"These three high-performance precision amplifiers allow National Semiconductor to serve a very important market segment," said Erroll Dietz, vice president of National's Amplifier product group. "National's new line of precision amplifiers delivers remarkable accuracy due to its very low offset voltage and drift. Also, because of their high input common-mode voltage range, these parts are perfect for demanding applications, especially where current sensing is needed."


National's bidirectional LMP8271 measures charge and discharge currents at high common-mode voltages typically found in precision applications. It uses an external reference voltage to set the voltage defining a zero-current condition. An LMP8271 output voltage greater than the external reference voltage indicates a charging current condition, while an output voltage below the external reference voltage identifies a discharging current condition. Accurate bidirectional load current measurements are achieved when monitoring the output with respect to the reference voltage.

LMP8270 and LMP8272

National's LMP8270 and LMP8272 are unidirectional, fixed-gain, differential amplifier products. These amplifiers will detect, amplify and filter small differential signals in the presence of high common mode voltages. For the LMP8270 and LMP8271, the gain is fixed at 20. For the LMP8272, the gain is fixed at 14. These parts have a -2V to 27V input common mode voltage range and a supply voltage range of 4.5V to 5.5V. These devices also function over an extended common mode input voltage (-5V to +36V), enabling high-side current sensing where the input voltage range far exceeds the supply voltage range of 5V.

The very low offset voltage (less than 250 microvolts) and offset drift (less than 15 microvolts/degrees Celsius guaranteed) of the LMP8270/71/72 allow for very accurate small input differential signal conditioning and minimal voltage offset error through the entire temperature range. Additionally, the extended operating temperature range of -40 degrees Celsius to +125 degrees Celsius allows these amplifiers to be used in extreme conditions, such as those found in automotive and industrial applications.

Pricing and Availability

National's new precision amplifiers are sampling now in limited quantities. Available in SOIC-8 packaging, National's LMP8270 is priced at $1.45, the LMP8271 is priced at $1.57, and the LMP8272 is priced at $1.45, all in 1,000-unit quantities. The LMP8270, LMP8271 and LMP8272 will be available in full production in March 2005. For more information on National's LMP8270/71/72, visit , and . For more information on National's amplifier products, visit . A large selection of amplifiers and filters are supported by National's Amplifiers Made SimpleSM WEBENCH(R) online design tool and WEBENCH Active Filter Designer online design tool, respectively. To explore these solutions, visit . To learn more about designing with amplifiers, visit National's library of online seminars at . To view a high-resolution downloadable photo of these products, visit National's photo gallery at .

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 markets include wireless handsets, displays, PCs and laptops. The company's analog products are also optimized for numerous applications in a variety of electronics markets, including medical, automotive, industrial, and test and measurement. Headquartered in Santa Clara, California, National reported sales of $1.98 billion for fiscal 2004, which ended May 30, 2004. Additional company and product information is available at

NOTE: LMP is a trademark, WEBENCH is a registered trademark, and Amplifiers Made Simple is a service mark of National Semiconductor Corporation. All other brand or product names are trademarks or registered trademarks of their respective holders.

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