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LT3055 Series - 500mA, Linear Regulator with Precision Current Limit and Diagnostics

The LT®3055 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.

Features Output Current: 500mA Dropout Voltage: 350mV Input Voltage Range: 1.8V 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 Typical Application

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

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