45V 500mA LDO Offers 25µVRMS Noise, Programmable Current Limit & Power Good

Jan 27 2014 - MILPITAS, CA
  • Linear Technology Corporation announces the LT3065, a high voltage, low noise, low dropout voltage linear regulator offering precision, programmable current limit and a power good flag. The device delivers up to 500mA output current with a 300mV dropout voltage at full load. It features a wide 1.8V to 45V input voltage range and output voltage is adjustable from 0.6V to 40V. A single REF/BYP pin capacitor provides low noise operation-only 25µVRMS across a 10Hz to 100kHz bandwidth, 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 LT3065 operates with a very small, low cost, 3.3µF ceramic output capacitor, optimizing stability and transient response. The LT3065 PWRGD flag indicates output regulation. One resistor programs the external precision current limit (±10% over temperature). Moreover, the device’s internal protection circuitry includes reverse-battery protection, reverse-output protection, reverse-current protection, current limit with foldback, and thermal limiting. The device’s wide input and output voltage ranges, fast transient response, low quiescent current of 55µA (operating) and <1µA (in shutdown) make it an excellent choice for industrial power supplies, avionic power supplies, automotive power supplies, battery-powered systems and instruments requiring optimum run time, and high reliability power supplies requiring more extensive protection.

    The LT3065 is available in thermally enhanced 10-lead 3mm × 3mm DFN and 12-lead MSOP packages, both with a compact footprint. The E- and I-grade versions are available from stock with an operating junction temperature of –40°C to +125°C, H grade is rated from –40°C to +150°C, and the MP-grade version is specified from –55 to +150°C. 1,000 piece pricing starts at $1.85 each for the E-grade. For more information, visit www.linear.com/product/lt3065.

    Summary of Features: LT3065

    • Output Current: 500mA
    • Dropout Voltage: 300mV
    • Input Voltage Range: 1.8V to 45V
    • Programmable Precision Current Limit: ±10%
    • Low Quiescent Current: 55µA
    • Power Good Flag
    • Low Noise: 25µVRMS (10Hz to 100kHz)
    • Adjustable Output Voltage: 0.6V to 40V
    • Single Capacitor Soft-Starts Reference & Lowers Output Noise
    • Output Tolerance: ±2% Over Line, Load & Temperature
    • Stable with Low ESR, Ceramic Output Capacitors (3.3µF minimum)
    • Current Limit Foldback Protection
    • Shutdown Current: <1µA
    • Reverse Battery & Thermal Limit Protection
    • 10-Lead 3mm × 3mm DFN & 12-Lead MSOP Packages

    45VIN, 0.6VOUT 500mA Ultralow Noise LDO with Power Good Flag


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