LT3071

5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining

Data Sheet
Rev. D
icon-recommended Recommended for New Designs
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Datasheet
Data Sheet Rev. D
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Overview

Features and Benefits

  • Output Current: 5A
  • Dropout Voltage: 85mV Typical
  • Digitally Programmable VOUT : 0.8V to 1.8V
  • Analog Output Margining: ±10% Range
  • Low Output Noise: 25μVRMS (10Hz to 100kHz)
  • Parallel Multiple Devices for 10A or More
  • Precision Current Limit: ±20%
  • Output Current Monitor: IMON = IOUT/2500
  • ±1% Accuracy Over Line, Load and Temperature
  • High Frequency PSRR: 30dB at 1MHz
  • Stable with Low ESR Ceramic Output Capacitors (15μF Minimum)
  • Enable Function Turns Output On/Off
  • VIOC Pin Controls Buck Converter to Maintain Low Power Dissipation and Optimize Efficiency
  • PWRGD/UVLO/Thermal Shutdown Flag
  • Current Limit with Foldback Protection
  • Thermal Shutdown
  • 28-Lead (4mm × 5mm × 0.75mm) QFN Package

Product Details

The LT3071 is a low voltage, UltraFast™ transient response linear regulator. The device supplies up to 5A of output current with a typical dropout voltage of 85mV. A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS. The LT3071’s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost. The LT3071’s features make it ideal for high performance FPGAs, microprocessors or sensitive communication supply applications.

Output voltage is digitally selectable in 50mV increments over a 0.8V to 1.8V range. An analog margining function allows the user to adjust system output voltage over a continuous ±10% range. The IC incorporates a unique tracking function to control a buck regulator powering the LT3071’s input. This tracking function drives the buck regulator to maintain the LT3071’s input voltage to VOUT + 300mV, minimizing power dissipation.

Internal protection includes UVLO, reverse-current protection, precision current limiting with power foldback and thermal shutdown. The LT3071 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package.

APPLICATIONS

  • FPGA and DSP Supplies
  • ASIC and Microprocessor Supplies
  • Servers and Storage Devices
  • Post Buck Regulation and Supply Isolation
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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)

Documentation

Tools & Simulations

LTspice

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.

LTspice

LTspice Simulations

LT3071 Demo Circuit - Programmable 85mV Dropout Linear Regulator (1.1-3V to 0.9V @ 5A)

Models for the following parts are available in LTspice:

LT3071

Product Recommendations

LT3071 Companion Parts

Recommended Related Parts

Reference Materials

Solutions Bulletins & Brochures (1)

Linear Low Dropout (LDO) Regulator Solutions

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.

LT3071 Material Declaration
Quality And Reliability
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PCN-PDN Information

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Support & Discussions

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.