Santa Clara, Calif. - Optimized for low-voltage, high-current applications in PCs and set-top boxes, National Semiconductor Corp.'s LP3881 dual-input low-dropout regulator kicks out at as little as 75 millivolts (160 mV maximum). Products in this CMOS LDO family, which now include the LP3881, -2 and -3, deliver a 1.2- to 1.5-V output at up to 3 amps, depending on version, from a 1.8-V input. These chips can deliver a custom voltage in 50-mV increments over the range of 1.25 to 1.8 V with an output accuracy of plus/minus 3 percent over line, load and temperature variations, National said. They also feature on/off control, and overtemperature and overcurrent protection. Typical dropout characteristics for the LP3883/2/1 are 210 mV at 3 A, 110 mV at 1.5 A and 75 mV at 0.8 A, respectively. Maximum dropout over those current ranges is 420, 270 and 160 mV over temperature. The LP3881 is priced at $2.08 each, the LP3882 at $2.18 and the LP3883 at $2.68, all in 1,000-unit quantities. They come in TO220-5 and TO263-5 packages.
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