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

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
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT3055 Typical Application
LT3055 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT3055EDE-3.3#PBF 4x3 DFN-16 DE E 05-08-1732 Yes
LT3055EDE-3.3#TRPBF 4x3 DFN-16 DE E 05-08-1732 Yes
LT3055EDE-5#PBF 4x3 DFN-16 DE E 05-08-1732 Yes
LT3055EDE-5#TRPBF 4x3 DFN-16 DE E 05-08-1732 Yes
LT3055EDE#PBF 4x3 DFN-16 DE E 05-08-1732 Yes
LT3055EDE#TRPBF 4x3 DFN-16 DE E 05-08-1732 Yes
LT3055EMSE-3.3#PBF MS-16E MSE E 05-08-1667 Yes
LT3055EMSE-3.3#TRPBF MS-16E MSE E 05-08-1667 Yes
LT3055EMSE-5#PBF MS-16E MSE E 05-08-1667 Yes
LT3055EMSE-5#TRPBF MS-16E MSE E 05-08-1667 Yes
LT3055EMSE#PBF MS-16E MSE E 05-08-1667 Yes
LT3055EMSE#TRPBF MS-16E MSE E 05-08-1667 Yes
LT3055HMSE-3.3#PBF MS-16E MSE H 05-08-1667 Yes
LT3055HMSE-3.3#TRPBF MS-16E MSE H 05-08-1667 Yes
LT3055HMSE-5#PBF MS-16E MSE H 05-08-1667 Yes
LT3055HMSE-5#TRPBF MS-16E MSE H 05-08-1667 Yes
LT3055HMSE#PBF MS-16E MSE H 05-08-1667 Yes
LT3055HMSE#TRPBF MS-16E MSE H 05-08-1667 Yes
LT3055IDE-3.3#PBF 4x3 DFN-16 DE I 05-08-1732 Yes
LT3055IDE-3.3#TRPBF 4x3 DFN-16 DE I 05-08-1732 Yes
LT3055IDE-5#PBF 4x3 DFN-16 DE I 05-08-1732 Yes
LT3055IDE-5#TRPBF 4x3 DFN-16 DE I 05-08-1732 Yes
LT3055IDE#PBF 4x3 DFN-16 DE I 05-08-1732 Yes
LT3055IDE#TRPBF 4x3 DFN-16 DE I 05-08-1732 Yes
LT3055IMSE-3.3#PBF MS-16E MSE I 05-08-1667 Yes
LT3055IMSE-3.3#TRPBF MS-16E MSE I 05-08-1667 Yes
LT3055IMSE-5#PBF MS-16E MSE I 05-08-1667 Yes
LT3055IMSE-5#TRPBF MS-16E MSE I 05-08-1667 Yes
LT3055IMSE#PBF MS-16E MSE I 05-08-1667 Yes
LT3055IMSE#TRPBF MS-16E MSE I 05-08-1667 Yes
LT3055MPMSE-3.3#PBF MS-16E MSE MP 05-08-1667 Yes
LT3055MPMSE-3.3#TRPBF MS-16E MSE MP 05-08-1667 Yes
LT3055MPMSE-5#PBF MS-16E MSE MP 05-08-1667 Yes
LT3055MPMSE-5#TRPBF MS-16E MSE MP 05-08-1667 Yes
LT3055MPMSE#PBF MS-16E MSE MP 05-08-1667 Yes
LT3055MPMSE#TR MS-16E MSE MP 05-08-1667 No
LT3055MPMSE#TRPBF MS-16E MSE MP 05-08-1667 Yes


LT3055 Package Drawing
LT3055 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3055EDE-3.3#PBF 4x3 DFN-16 E $3.14 $2.20 Yes
LT3055EDE-3.3#TRPBF 4x3 DFN-16 E $2.26 Yes
LT3055EDE-5#PBF 4x3 DFN-16 E $3.14 $2.20 Yes
LT3055EDE-5#TRPBF 4x3 DFN-16 E $2.26 Yes
LT3055EDE#PBF 4x3 DFN-16 E $3.14 $2.20 Yes
LT3055EDE#TRPBF 4x3 DFN-16 E $2.26 Yes
LT3055EMSE-3.3#PBF MS-16E E $3.14 $2.20 Yes
LT3055EMSE-3.3#TRPBF MS-16E E $2.26 Yes
LT3055EMSE-5#PBF MS-16E E $3.14 $2.20 Yes
LT3055EMSE-5#TRPBF MS-16E E $2.26 Yes
LT3055EMSE#PBF MS-16E E $3.14 $2.20 Yes
LT3055EMSE#TRPBF MS-16E E $2.26 Yes
LT3055HMSE-3.3#PBF MS-16E H $3.91 $2.74 Yes
LT3055HMSE-3.3#TRPBF MS-16E H $2.80 Yes
LT3055HMSE-5#PBF MS-16E H $3.91 $2.74 Yes
LT3055HMSE-5#TRPBF MS-16E H $2.80 Yes
LT3055HMSE#PBF MS-16E H $3.93 $2.75 Yes
LT3055HMSE#TRPBF MS-16E H $2.81 Yes
LT3055IDE-3.3#PBF 4x3 DFN-16 I $3.46 $2.42 Yes
LT3055IDE-3.3#TRPBF 4x3 DFN-16 I $2.48 Yes
LT3055IDE-5#PBF 4x3 DFN-16 I $3.46 $2.42 Yes
LT3055IDE-5#TRPBF 4x3 DFN-16 I $2.48 Yes
LT3055IDE#PBF 4x3 DFN-16 I $3.46 $2.42 Yes
LT3055IDE#TRPBF 4x3 DFN-16 I $2.48 Yes
LT3055IMSE-3.3#PBF MS-16E I $3.46 $2.42 Yes
LT3055IMSE-3.3#TRPBF MS-16E I $2.48 Yes
LT3055IMSE-5#PBF MS-16E I $3.46 $2.42 Yes
LT3055IMSE-5#TRPBF MS-16E I $2.48 Yes
LT3055IMSE#PBF MS-16E I $3.46 $2.42 Yes
LT3055IMSE#TRPBF MS-16E I $2.48 Yes
LT3055MPMSE-3.3#PBF MS-16E MP $8.49 $5.94 Yes
LT3055MPMSE-3.3#TRPBF MS-16E MP $6.00 Yes
LT3055MPMSE-5#PBF MS-16E MP $8.49 $5.94 Yes
LT3055MPMSE-5#TRPBF MS-16E MP $6.00 Yes
LT3055MPMSE#PBF MS-16E MP $8.49 $5.94 Yes
LT3055MPMSE#TR MS-16E MP $8.55 $6.00 No
LT3055MPMSE#TRPBF MS-16E MP $8.55 $6.00 Yes
Buy NowRequest Samples
* 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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1865A LT3055EDD Demo Board | Micropower Linear Regulator, Precision Current Limit, Diagnostics, ±45V Input Voltages, 2.2V ≤ VIN ≤ 45V, Vout = 1.2V/1.5V/1.8V/2.5V/3.3V/5V @ 500mA $150.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3055HMSE-3.3#PBF MS-16E H $3.91 $2.74 Yes
LT3055HMSE-3.3#TRPBF MS-16E H $2.80 Yes
LT3055HMSE-5#PBF MS-16E H $3.91 $2.74 Yes
LT3055HMSE-5#TRPBF MS-16E H $2.80 Yes
LT3055HMSE#PBF MS-16E H $3.93 $2.75 Yes
LT3055HMSE#TRPBF MS-16E H $2.81 Yes
LT3055IMSE-3.3#PBF MS-16E I $3.46 $2.42 Yes
LT3055IMSE-3.3#TRPBF MS-16E I $2.48 Yes
LT3055IMSE-5#PBF MS-16E I $3.46 $2.42 Yes
LT3055IMSE-5#TRPBF MS-16E I $2.48 Yes
LT3055IMSE#PBF MS-16E I $3.46 $2.42 Yes
LT3055IMSE#TRPBF MS-16E I $2.48 Yes
LT3055MPMSE-3.3#PBF MS-16E MP $8.49 $5.94 Yes
LT3055MPMSE-3.3#TRPBF MS-16E MP $6.00 Yes
LT3055MPMSE-5#PBF MS-16E MP $8.49 $5.94 Yes
LT3055MPMSE-5#TRPBF MS-16E MP $6.00 Yes
LT3055MPMSE#PBF MS-16E MP $8.49 $5.94 Yes
LT3055MPMSE#TRPBF MS-16E MP $8.55 $6.00 Yes
Buy NowRequest Samples
* 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 Linear Technology sales office or authorized distributor.

Applications

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

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT3055

Technical Support