National Semiconductor offers power-saving devices

Officials of National Semiconductor Corp. in Santa Clara, Calif., are offering a precision CVCC (constant voltage, constant current) charge controller to improve the run-time of the single- and dual-cell lithium-ion battery packs in hand-held electronic devices. The LM3622 controls charge and end-of-charge voltage and current from a current-limited DC-DC switching charger or linear charger. In the A-grade configuration, the LM3622 is rated at 0.6 percent regulation. National`s LM3622 is functionally equivalent to the Mitsumi MM1332, and offers improved voltage regulation accuracy and selectable end-of life voltage in an SO-8 package. With its pin-select feature, the LM3622 gives designers a choice of 2.7 volts or 2.15 volts end-of-life detection voltages. The device attains maximum battery capacity without external precision resistors. For more information, contact National Semiconductor by phone at 800-272-9959, or on the World Wide Web at http://www.national.com/. — J.K.