National Semiconductor Announces New LP2989 LDO Voltage Regulator

National Semiconductor Corp. (Santa Clara, CA) has introduced a full-featured 500mA LDO voltage regulator for medium-level current applications in PC and portable products requiring low-noise voltage conversion. The LP2989, housed in a chip-scale, leadless lead-frame power package (LLP), is designed to fit the tight space requirements of compact portable designs. The LLP package measures 4.0 x 4.0mm, has a profile of 0.8mm, and a pin pitch of 0.8mm. Power dissipation, measured by theta j-a, is a 78 degrees C/W. Typical applications for the LP2989 include DSPs, graphics cards, PC and cellular phone audio sub-systems.

Output noise for the LP2989 is 18microV. Ground pin current is typically 1mA at 200mA loads and 3mA at 500mA loads, respectively. The device contains logic-controlled on/off. Quiescent current drops to less than one microA in shutdown mode. Voltage options range from 1.5V to 5V. The precise output voltage is ±1.5 percent at room temperature over load and line variations. The LP2989 includes an error flag that goes low when the output drops 5 percent below nominal. The LP2989 can be used in wake-on-LAN applications. It also contains protection for over-temperature and over-current conditions. The device has low output capacitor requirements of 4.7microF, low ESR. The LP2989 has a 500mA continuous output current, and the feature set for the fixed-output unit begins with an ultra-low dropout voltage of 310mV at a 500mA load and 150mV at a 200mA load.

"The high-performance LP2989, coupled with the LLP package design, gives system designers a versatile, low-cost, small form factor LDO voltage regulator with a full feature set for a wide variety of applications. The LP2989 is an important complement to National's leading portfolio of micropower LDO voltage regulators," said William Weiss, product marketing manager.

Available now, the LP2989 is priced between $0.91 and $.99 each, depending on configuration, in 1,00-unit quantities.