LT3045 - 20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator

Features

  • Ultralow RMS Noise: 0.8μVRMS (10Hz to 100kHz)
  • Ultralow Spot Noise: 2nV/√Hz at 10kHz
  • Ultrahigh PSRR: 76dB at 1MHz
  • Output Current: 500mA
  • Wide Input Voltage Range: 1.8V to 20V
  • Single Capacitor Improves Noise and PSRR
  • 100μA SET Pin Current: ±1% Initial Accuracy
  • Single Resistor Programs Output Voltage
  • High Bandwidth: 1MHz
  • Programmable Current Limit
  • Low Dropout Voltage: 260mV
  • Output Voltage Range: 0V to 15V
  • Programmable Power Good
  • Fast Start-Up Capability
  • Precision Enable/UVLO
  • Parallelable for Lower Noise and Higher Current
  • Internal Current Limit with Foldback
  • Minimum Output Capacitor: 10μF Ceramic
  • Reverse Battery and Reverse Current Protection
  • 12-Lead MSOP and 10-Lead 3mm × 3mm DFN Packages

Typical Application

LT3045 Typical Application
LT3045 Typical Application

Description

The LT®3045 is a high performance low dropout linear regulator featuring LTC’s ultralow noise and ultrahigh PSRR architecture for powering noise sensitive applications. Designed as a precision current reference followed by a high performance voltage buffer, the LT3045 can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB.

The device supplies 500mA at a typical 260mV dropout voltage. Operating quiescent current is nominally 2.2mA and drops to <<1μA in shutdown. The LT3045’s wide output voltage range (0V to 15V) while maintaining unitygain operation provides virtually constant output noise, PSRR, bandwidth and load regulation, independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capability and programmable power good to indicate output voltage regulation.

The LT3045 is stable with a minimum 10μF ceramic output capacitor. Built-in protection includes reverse battery protection, reverse current protection, internal current limit with foldback and thermal limit with hysteresis. The LT3045 is available in thermally enhanced 12-Lead MSOP and 10-Lead 3mm × 3mm DFN packages.

Packaging

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

Part Number Package Code Temp Package
Drawing
RoHS
LT3045EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT3045EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT3045EMSE#PBF MS-12E MSE E 05-08-1666 Yes
LT3045EMSE#TRPBF MS-12E MSE E 05-08-1666 Yes
LT3045IDD#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LT3045IDD#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes
LT3045IMSE#PBF MS-12E MSE I 05-08-1666 Yes
LT3045IMSE#TRPBF MS-12E MSE I 05-08-1666 Yes


LT3045 Package Drawing
LT3045 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
LT3045EDD#PBF 3x3 DFN-10 E $4.00 $2.80 Yes
LT3045EDD#TRPBF 3x3 DFN-10 E $4.06 $2.86 Yes
LT3045EMSE#PBF MS-12E E $4.00 $2.80 Yes
LT3045EMSE#TRPBF MS-12E E $4.06 $2.86 Yes
LT3045IDD#PBF 3x3 DFN-10 I $4.64 $3.25 Yes
LT3045IDD#TRPBF 3x3 DFN-10 I $4.70 $3.31 Yes
LT3045IMSE#PBF MS-12E I $4.64 $3.25 Yes
LT3045IMSE#TRPBF MS-12E I $4.70 $3.31 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
DC2491A LT3045 Demoboard | 20V, 500mA, Ultralow Noise Ultrahigh PSRR RF LDO Regulator $150.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
  • Very Low Noise Instrumentation
  • High Speed/High Precision Data Converters
  • Medical Applications: Imaging, Diagnostics
  • Precision Power Supplies
  • Post-Regulator for Switching 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 IV:
LT3045

Technical Support