National Semiconductor Corp. (Santa Clara, CA) introduced its LP3883 CMOS dual-input, low dropout (LDO) voltage regulator, which is optimized for low-voltage, high-current applications in set-top boxes, servers and desktop PCs. The new high-current linear regulator consumes only 3mA of quiescent current without compromising transient response.
The LP3883 uses a separate input to power the control circuitry. The power input may be fed independently from the high-current supply, facilitating conversion from input rails of less than 2.5V. This feature, combined with the device’s guaranteed maximum dropout of less than 450mV, allows efficient linear conversion from a 2.5V or 1.8V rail. The LP3883’s circuit approach enables delivery of custom voltages in 50mV increments in the range of 1.25V to 1.8V within four weeks. The LP3883 has an output voltage accuracy of ±3 percent over line, load and temperature variations, and features on/off control, over-temperature and over-current protection.
The LP3883 LDO regulator with 1.2V, 1.5V and 1.8V output voltages is available for shipment in five-lead TO-220 and TO-263 packages. It is priced at $2.68 each in 1,000-piece quantities.
