National Semi Debuts LP389x Family LDO Regulators

National Semiconductor Corp. (Santa Clara, CA) introduced a new family of CMOS, dual-input, rail low dropout voltage (LDO) regulators targeting low-voltage, high-current applications in cable modems, desktop PCs and set-top boxes. Tailored for powering the latest processor, digital ASIC and DSP cores, the new family’s dual-input architecture offers high-performance, linear regulation while providing significant power savings and reduced external component costs to design engineers.

The LP389x family is comprised of the LP3893, LP3892 and LP3891. The dropout voltage for the family is typically at 270mV, 140mV and 100mV at 3A, 1.5A and 0.8A and a maximum of 1V, 500mV and 400mV over temperature. Other key features of the LP389x family include on/off control, an output-voltage accuracy of ±3% over all conditions, low output capacitor requirements (10mF), and over-temperature and over-current protection. The family’s unique circuit approach enables delivery of custom voltages in 50mV increments in the range of 1.2V to 1.8V within four weeks ARO.

Shipping now, the LP389x family is offered in either an TO220-5 or an TO263-5 package. In quantities of 1,000 units, the LP3893 is priced at $1.75 each; the LP3892 is priced at $1.40 each and the LP3891 is priced at $1.20 each.