Features and Benefits
- 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
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 Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 1865A is an adjustable 500mA linear regulator featuring the LT3055. The demo board allows input voltages up to ±45V. The input voltage range is 2.2V to 45V and the jumper selectable output voltage can be set to 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V or a user-defined value.
The LT3055 is a micropower (65µA no-load quiescent current), low noise and low dropout (350mV) voltage linear regulator. A 10nF bypass capacitor reduces output noise to 25μVRMS (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. The LT3055 current limit can be programmed by a single resistor, and is accurate to ±10% over a wide input voltage and temperature range. Another resistor programs the LT3055’s optional minimum output current monitor, useful for detecting open-circuit conditions.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.