1. Products
  2. Power Management
  3. LDO Linear Regulators
  4. Positive Linear Regulators (LDO)
  5. LT3028

Data Sheet
PDF
User Guides
1 View All

Overview

Features and Benefits

  • Low Noise: 20µVRMS (10Hz to 100kHz)
  • Low Quiescent Current: 30µA/Output
  • Independent Inputs
  • Wide Input Voltage Range: 1.8V to 20V
  • Output Current: 100mA/500mA
  • Very Low Shutdown Current: <0.1µA
  • Low Dropout Voltage: 300mV/320mV at 100mA/500mA
  • Adjustable Outputs from 1.22V to 20V
  • Stable with as Low as 1µF/3.3µF Output Capacitor
  • Stable with Aluminum, Tantalum or Ceramic Capacitors
  • Reverse-Battery Protected
  • No Protection Diodes Needed
  • Overcurrent and Overtemperature Protected
  • Tracking/Sequencing Capability
  • Thermally Enhanced 16-Lead TSSOP and 16-Lead (5mm × 3mm) DFN Packages

Product Details

The LT3028 is a dual, micropower, low noise, low dropout regulator with independent inputs. With an external 0.01µF bypass capacitor, output noise is a low 20µVRMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 30µA quiescent current per output makes it an ideal choice. In shutdown, quiescent current drops to less than 0.1µA. Shutdown control is independent for each output, allowing for flexibility in power management. The device is capable of operating over an input voltage range of 1.8V to 20V. Output 1 can supply 500mA of output current with a dropout voltage of 320mV. The device can supply 100mA of output current from Output 2 with a dropout voltage of 300mV. Quiescent current is well controlled in dropout.

The LT3028 regulator is stable with output capacitors as low as 1µF for the 100mA output and 3.3µF for the 500mA output. Small ceramic capacitors can be used without the series resistance required by other regulators.

Internal protection circuitry includes reverse-battery protection, current limiting and thermal limiting protection. The device is available as an adjustable device with a 1.22V reference voltage. The LT3028 regulator is available in the thermally enhanced 16-lead TSSOP and 16-lead, low profile (5mm × 3mm × 0.75mm) DFN packages.

Applications

  • Cellular Phones
  • Pagers
  • Battery-Powered Systems
  • Frequency Synthesizers
  • Wireless Modems
  • Tracking/Sequencing Power Supplies

Product Categories

Comparable Parts Click to see all in Parametric Search

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 & Resources

  • View All (5)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Solutions Bulletins & Brochures (1)
  • Technical Articles (1)
    • Document Type

    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

    LT3028 Demo Circuit - Dual Low Noise Regulators (3.7-20V to 3.3V @ 500mA & 2.9-20V to 2.5V @ 100mA)

    Models for the following parts are available in LTspice:

    LT3028

    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.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LT3028EDHC#PBF Material Declaration Reliability Data 16-Lead DFN (5mm x 3mm w/ EP)
    LT3028EDHC#TRPBF Material Declaration Reliability Data 16-Lead DFN (5mm x 3mm w/ EP)
    LT3028EFE#PBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT3028EFE#TRPBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT3028IDHC#PBF Material Declaration Reliability Data 16-Lead DFN (5mm x 3mm w/ EP)
    LT3028IDHC#TRPBF Material Declaration Reliability Data 16-Lead DFN (5mm x 3mm w/ EP)
    LT3028IFE#PBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT3028IFE#TRPBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    Wafer Fabrication Data R386 Reliability Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • LT3028EFE#PBF Production
    • LT3028EFE#TRPBF Production
    • LT3028IFE#PBF Production
    • LT3028IFE#TRPBF Production

    Support & Discussions

    LT3028 Contact ADI Technical Support »
    LT3028 Ask your question »
    LT3028 Contact ADI Technical Support » LT3028 Ask your question »

    Sample & Buy


    Ordering FAQs


    See our Ordering FAQs for answers to questions about online orders, payment options and more.

     

    Buy Now Pricing


    (**) Displayed Buy Now Price and Price Range is based on small quantity orders.

     

    List Pricing


    (*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

     

    Lead Times


    Please see the latest communication from our CCO regarding lead times.

     

    Sampling


    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.


    Price Table Help

     

    Evaluation Boards

    Pricing displayed is based on 1-piece.

    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.

    •