The 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. This device 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. Furthermore, a current monitor function sources current equal to 1/500th of output current, allowing the user to measure output current or calculate the device's power dissipation. The LT3055's wide input and output voltage ranges, fast transient response, low quiescent current of 65µA (operating) and <1µA (in shutdown) make it an excellent choice for 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. 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 and the H grade operates from -40°C to +150°C. 1,000 piece pricing starts at $2.20 each for the E grade.
