45V input 200mA LDO offers active output discharge

18th June 2014

Nat Bowers

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Datasheet

Linear Technology announces the LT3063, a high voltage, low noise, low dropout voltage linear regulator with active output discharge. The IC delivers up to 200mA of continuous output current with a 300mV dropout voltage at full load. The LT3063 includes an internal NMOS pull-down that discharges the output voltage if either the SHDN pin is driven low or the input voltage is turned off.

This rapid output discharge helps protect the load in applications requiring power conditioning on both start-up and shutdown, such as high-end imaging sensors. The LT3063 features a wide 1.6-45V input voltage range and delivers adjustable output voltages of 0.6-19V. A single capacitor provides programmable ultralow noise operation, only 30µV_RMS across a 10Hz to 100kHz bandwidth and reference soft-start functionality, preventing output voltage overshoot at turn-on.

The LT3063’s output voltage tolerance is highly accurate at ±2% over line, load and temperature. The device’s input and output voltage range, fast transient response, low quiescent current of 45µA (operating) and less than 3µA (in shutdown) make it an excellent choice for portable battery-powered systems that require optimum run time, and for usage in automotive, industrial and avionic power supply applications.

The LT3063 operates with a small, low cost, ceramic output capacitor, optimising stability and transient response. The IC is stable with a minimum value 3.3µF output capacitor. The device’s internal protection circuitry includes reverse-battery protection, reverse-current protection, current limit with foldback and thermal limiting.

The LT3063 is housed in thermally enhanced 8-lead 2x3mm DFN and MSOP packages, offering a compact footprint. The E- and I-grade versions feature an operating junction temperature from -40°C to +125°C, the high reliability H grade is specified from -40°C to +150°C, and the military MP-grade operates from -55°C to +150°C. 1,000 unit pricing starts at $1.67 (USD) each for both the DFN and MSOP package in E grade.