Features and Benefits

  • Output Current: 500mA
  • Dropout Voltage: 350mV
  • Input Voltage Range: 1.6V to 45V
  • Programmable Precision Current Limit: ±10%
  • Output Current Monitor: 1/500th of IOUT
  • Programmable Minimum IOUT Monitor
  • Temperature Monitor: 10mV/°C
  • FAULT Indicator: Current Limit, Thermal Limit or Minimum IOUT
  • Low Noise: 25μVRMS (10Hz to 100kHz)
  • Adjustable Output (VREF = VOUT(MIN) = 0.6V)
  • Output Tolerance: ±2% Over Load, Line and Temperature
  • Stable with Low ESR, Ceramic Output Capacitors (3.3μF Minimum)
  • Shutdown Current: <1μA
  • Reverse Battery and Thermal Limit Protection
  • 16-Lead 4mm × 3mm DFN and MSOP Packages

Product Details

The LT3055 series are micropower, low noise, low dropout voltage (LDO) linear regulators. The devices supply 500mA of output current with a dropout voltage of 350mV. A 10nF bypass capacitor reduces output noise to 25μVRMS in a 10Hz to 100kHz bandwidth and soft starts the reference. The LT3055’s ±45V input voltage rating combined with its precision current limit and diagnostic functions make the IC an ideal choice for robust, high reliability applications.

A single resistor programs the LT3055’s current limit, accurate to ±10% over a wide input voltage and temperature range. Another resistor programs the LT3055’s minimum output current monitor, useful for detecting open-circuit conditions. The current monitor function sources a current equal to 1/500th of output current. Logic fault pins assert low if the LT3055 is in current limit (FAULT2), operating below its minimum output current (FAULT1) or is in thermal limit (both FAULT1 and FAULT2). PWRGD indicates output regulation. The TEMP pin indicates average die temperature.

The LT3055 optimizes stability and transient response with low ESR ceramic capacitors, requiring a minimum of 3.3μF. Internal protection circuitry includes current limiting, thermal limiting, reverse battery protection, reverse current protection and reverse output protection.

The LT3055 is available in fixed output voltages of 3.3V and 5V, and as an adjustable device with an output voltage range from 0.6V to 40V.


  • Protected Antenna Supplies
  • Automotive Telematics
  • Industrial Applications (Trucks, Forklifts, etc.)
  • High Reliability Applications
  • Noise-Sensitive RF or DSP Supplies

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

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Product Recommendations

LT3055 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.