Linear Technology Corp.’s LT3055 is a high voltage, low noise, low dropout voltage linear regulator offering precision, programmable current limit and diagnostic capability.
The device delivers up to 500mA output current with a 350mV dropout voltage at full load. The LT3055 features a wide 2V to 45V input voltage range, delivering adjustable output voltages from 0.6V to 40V. A single capacitor at the REF/BYP pin provides programmable low noise operation--only 25µVRMS across a wide bandwidth of 10Hz to 100kHz, and also reference soft start functionality, preventing output voltage overshoot at turn-on. Output voltage tolerance is highly accurate at ±2% over line, load and temperature.
The LT3055 provides several diagnostic and safety functions. A resistor at the IMAX pin programs current limit, accurate to ±10% over the full temperature range. Also, a resistor at the IMIN pin programs a minimum output current detector, useful for identifying open-circuit conditions.
Applications include active antenna supplies, industrial power supplies, battery-powered systems requiring optimum run time, and high reliability power supplies requiring diagnostic information and protection functions.
The LT3055 is available in thermally enhanced 16-lead 3mm x 4mm DFN and 16-lead MSOP packages, both with a compact footprint. The E- and I-grade versions feature an operating junction temperature of -40°C to +125°C, MP-grade operates from -55 to +150°C (MSOP package only), and the H grade operates from -40°C to +150°C (MSOP package only). Devices are in stock, and 1,000 piece pricing starts at $2.20 each for the E grade.