NATIONAL SEMICONDUCTOR INTRODUCES INDUSTRY'S FIRST CMOS SERIES VOLTAGE REFERENCE WITH 0.05% ACCURACY AND 10PPM/?C TEMPCO IN A SOT-23

LM4130, LM4120 and LM4050/51 Families of Precision References Offer a Range of Voltage, Accuracy and Temperature Coefficient for Battery-Operated and Industrial Applications

November 29, 1999 - National Semiconductor Corporation (NYSE:NSM) today announced that it is expanding its popular voltage reference product offerings with the introduction of three product families of high-precision series and shunt references that offer higher accuracy and low temperature coefficient levels. The LM4130, LM4120 and LM4050, LM4051 offer a wide range of voltage and precision options for easy integration into battery-operated and industrial applications. The LM4130 is the industry's first high precision CMOS series voltage reference with 0.05% accuracy and a very low temperature coefficient of 10ppm/?C in the miniature SOT-23 package.

"With the LM4130, LM4120 and LM4050, LM4051, we offer a complete range of affordable high precision series and shunt references with equal or better performance than our competitors, but in a smaller SOT-23 package. Indeed, our closest competitor offers 10ppm/?C references in the much bigger SO-8 package," said Nicolas Cuendet, marketing manager for National's Power Management Group. "With the highest grade LM4130A, we are exploiting our new CMOS process technology to break through the high precision reference market with a best-of-class reference. Moreover, we will offer these products at an appreciably lower price than similar competitive products."

LM4130, LM4120 and LM4051 Product Offerings
The features of the LM4130, LM4120 and LM4050, LM4051 are summarized in the table below. The LM4130, available in five grades and three voltage options for greater flexibility, has a low supply current of just 75mA and is the world's first 10ppm/?C reference in a SOT-23 package. The LM4120, available in two grades and seven voltage options, features a low reference noise of just 24mVpp, as well as a unique powerdown feature, or sleep mode, that allows the user to shut the part off when it is not operating in order to save battery life. The LM4050/51, a shunt reference, offers a low current of 60mA, a tempco of 50ppm/?C and come in three grades and seven voltage options between 1.2V and 10V.

                                    LM4130

Type                               Series (LDO)
Voltage Options (V)             2.048, 2.5, 4.096
Initial accuracy (%)       0.05%, 0.1%, 0.2%, 0.4%, 0.5%
Tempco (max)                 10, 20, 30 ppm/(degree)C
Quiescent current (max)              75uA
Output current                       20mA
Dropout voltage (max)             275mV @ 10mA
Noise                        125uVpp (0.1Hz to 10Hz)
Operating temp. range          -40 to 85(degree)C
                 For information about operation up to
                   +125(degree)C, contact National.
Package                             SOT23-5


                                    LM4120

Type                              Series (LDO)
Voltage Options (V)     1.8, 2.048, 2.5, 3.0,3.3, 4.096, 5
Initial accuracy (%)              0.2%, 0.5%
Tempco (max)                   50 ppm/(degree)C
Quiescent current (max)             250uA
Output current                     +/- 5mA
Dropout voltage (max)             210mV @ 5mA
Noise                        24uVpp (10Hz to 10kHz)
Operating temp. range          -40 to 85(degree)C
                 For information about operation up to
                   +125(degree)C, contact National.
Package                             SOT23-5


                                    LM4050/51

Type                                  Shunt
Voltage Options (V)     1.2, ADJ, 2.5, 4.096, 5, 8.2, 10
Initial accuracy (%)            0.1%, 0.2%, 0.5%
Tempco (max)                    50 ppm/(degree)C
Quiescent current (max)              60uA
Output current                       15mA
Dropout voltage (max)                N/A
Noise                        20uVrms (10Hz to 10kHz)
Operating temp. range          -40 to 85(degree)C
                 For information about operation up to
                   +125(degree)C, contact National.
Package                             SOT23-3

Applications
The LM4130, LM4120 and LM4050, LM4051 are ideal for battery-operated devices, as well as battery chargers for cell phones and notebook computers. In addition, the voltage references can be used in a number of instrumentation and industrial applications, and in cellular base stations that require a very low temperature coefficient.

Price and Availability
The LM4130 is priced starting at $1.35, the LM4120 at $0.85 and the LM4050, LM4051 at $0.75 when purchased in quantities of 1,000. For more information on these products, visit National's World Wide Web site at LM4130, LM4120, LM4050 and LM4051.

About National Semiconductor
National Semiconductor provides system-on-a-chip solutions for the information age. Combining real-world analog and state-of-the-art digital technology, the company's chips lead many sectors of the personal computer, communications, and consumer markets. With headquarters in Santa Clara, California, National reported sales of $2 billion for its last fiscal year and currently has 11,000 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com.

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