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45V 100mA LDO Offers 30µVRMS Noise, Programmable Current Limit & Diagnostic Information

25th June 2010

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Datasheet

Linear Technology has announced the LT3050, a high voltage, low noise, low dropout voltage linear regulator offering precision, programmable current limit and diagnostic capability. The device delivers up to 100mA output current with a 340mV dropout voltage at full load. The LT3050 features a wide 2V to 45V input voltage range, delivering adjustable output voltages from 0.6V to 44.5V. A single capacitor at the REF/BYP pin provides programmable low noise operation--only 30µVRMS across a wide bandwidth of 10Hz to 100kHz--and 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 LT3050 provides several diagnostic and safety functions. A single resistor at the IMAX pin programs current limit, accurate to ±5% over the full input voltage and temperature range. Also, a single 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 1/100th of output current, allowing the user to measure output current or calculate the device's power dissipation. A logic Fault pin asserts low if the LT3050 is in current limit, operating below its minimum output current (open-circuit) or is in thermal shutdown. Moreover, the LT3050's internal protection circuitry includes reverse-battery protection, reverse-output protection, reverse-current protection, internal default current limiting and thermal limiting.

The LT3050 operates with a very small, low cost, 2.2µF ceramic output capacitor, optimizing stability and transient response. This tiny external capacitor can be used without the addition of series resistance (ESR) as is common with many other regulators. The LT3050's wide input and output voltage ranges, fast transient response, low quiescent current of 50µA (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 LT3050EDDB & LT3050IDDB are housed in the 12-lead 2mm x 3mm DFN package, while the LT3050EMS8E & LT3050IMS8E are available in the 12-lead thermally enhanced MSOP package, all offering a compact footprint. Both E and I grade versions are available from stock with an operating junction temperature of -40ºC to +125ºC, while the MP grade operates from -55ºC to +125ºC (MSOP package only, LT3050MPMS8E).