Automotive Electronics

45V Input 100mA LDO Offers Active Output Discharge

Linear Technology Corporation announces the LT3061, a high-voltage, low-noise, low-dropout-voltage linear regulator with active output discharge. The device delivers up to 100mA of continuous output current with a 250mV dropout voltage at full load. The LT3061 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 in high-end imaging sensors.

The LT3061 features a wide 1.6V to 45V input voltage range and delivers adjustable output voltages from 0.6V to 19V. A single capacitor provides programmable ultralow noise operation, only 30µVRMS across a 10Hz to 100kHz bandwidth and reference soft-start functionality, preventing output voltage overshoot at turn-on. The LT3061's output voltage tolerance is highly accurate at ±2% over line, load and temperature. The device's wide input and output voltage range, fast transient response, low quiescent current of 45µA (operating) and <2µA (in shutdown) make it ideal for portable battery-powered systems that require optimum run time, and for use in automotive, industrial and avionic power supply applications.

The LT3061 operates with a small, low cost, ceramic output capacitor, optimizing 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 LT3061 is housed in thermally enhanced 8-lead 2mm x 3mm DFN and MSOP packages, offering a compact footprint. The E- and I-grade versions feature an operating junction temperature of -40 to +125 degrees C, the high reliability H-grade is specified from -40 to +150 degrees C and the military MP-grade operates from -55 to +150 degrees C. 1,000 piece pricing starts at $1.55 each for both the DFN and MSOP package E-grades, respectively.

Linear Technology Corporation
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