NATIONAL LAUNCHES VOLTAGE DOUBLERS FOR OPTIMIZED POWER SOLUTIONS IN CELL PHONE, HANDHELD, PORTABLE AND BATTERY-POWERED PRODUCTS

LM2765/6/7 Offer Choice of Frequencies, Capacitor Values and Shutdown Polarities for Flexible Designs -- Adds to National's Expanding Power Portfolio

August 29, 2000 - National Semiconductor Corporation (NYSE:NSM) today announced three new voltage doublers that enable designers to cost-effectively optimize power solutions in cell phone, handheld, portable and battery-powered applications. The switched-capacitor LM2765, LM2766 and LM2767, housed in tiny SOT23 packages, provide choices of frequencies, capacitor values and shutdown polarities while offering a high 20mA typical output current.

"These three flexible devices join National's growing family of switched capacitor voltage doublers and inverters to meet customers' particular requirements. For example, the LM2766 with active low shutdown answers the need of our cell phone customers for a higher switching frequency to ensure that ripple harmonics don't interfere with sensitive radio circuitry," said Jim Schuessler, product marketing manager for Portable Power Products at National.

These devices typically solve application problems by offering an easy-to-design auxiliary supply without adding a lot of cost or board area. The flexibility of these parts allows designs to be fine tuned and still meet time-to-market goals.

Popular applications of the doublers include: Wireless communications terminals; cellular systems, such as GSM, CDMA or PCS TDMA; cordless systems; handheld PCs and organizers; flat panel displays and Global Positioning Systems. Highest-volume applications include generating the positive bias for passive LCD displays and boosting the battery voltage to drive white LED backlights for color and web displays, popularized for internet appliances.

The LM2765 features a charge-pump frequency of 50kHz, a capacitor value of 3.3?F, an active high shutdown pin and a typical supply current of 130microamps. The LM2766 has a charge-pump frequency of 200kHz, a capacitor value of 1.0?F, an active low shutdown pin and a typical supply current of 450?A. The LM2767 features a charge pump frequency of 11kHz, a capacitor value of 10?F and a typical supply current of 40?A.

Other features include a 96% typical efficiency at 15mA to prolong battery life and a voltage range of 1.8 to 5.5V. The devices use no inductors for smaller size, higher reliability and lower radiated EMI.

Pricing and Availability
Available now, the LM2765M6 and LM2766M6 and LM2767M5 are priced at US$0.75 each in 1000-unit quantities. The first two devices are housed in tiny, low-cost SOT23-6 packages and the LM2767 is in a SOT23-5 package.

For more information on the LM2765, LM2766 and LM2767, visit National's World Wide Web site at http://www.national.com/pf/LM/LM2765.html, http://www.national.com/pf/LM/LM2766.html and http://www.national.com/pf/LM/LM2767.html, or contact National's Design Support Group at 1-800-272-9959. For more information on National Semiconductor's power products, visit power.national.com.

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 communications, consumer and personal computer, markets. With headquarters in Santa Clara, California, National reported sales of $2.1 billion for its last fiscal year and has about 10,500 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com.