LT3045
20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator
Top
Overview
Features and Benefits
- 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
- AEC-Q100 Qualified for Automotive Applications
LT3045-EP Supports Defense and Aerospace Applications (AQEC
Standard)
- Download LT3045-EP Data Sheet (pdf)
- Military Temperature Range (–55°C to 150°C)
- Controlled Manufacturing Baseline
- One Assembly/Test Site
- One Fabrication Site
- Product Change Notification
- Qualification Data Available on Request
- V62/21614 Data Sheet
Product Details
The LT3045 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 unity-gain 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.
The LT3045-EP supports defense and aerospace applications (AQEC)
| VIOC Function | |
| LT3045-1 | Yes |
| LT3045 | No |
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 Categories
Markets and Technologies
Product Lifecycle
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 (2)
Documentation & Resources
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V62/21614 Data Sheet2/10/2022PDF381 K
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LT3045-EP: 20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator Data Sheet (Rev. A)2/25/2021PDF218 K
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LT3045: 20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator Data Sheet (Rev. D)9/16/2016PDF4 M
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R531 Reliability Data3/26/2018PDF23 K
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SCP-LT3045-1-EVALZ - Demo Manual (Rev. 0)2/1/2021PDF1 M
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DC2491A - Demo Manual8/19/2016PDF1M
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High Performance Low Dropout Linear Regulators (LDOs)7/13/2017PDF0M
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Linear Low Dropout (LDO) Regulator Solutions4/17/2018PDF3 M
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Microwave Synthesizer Offers Multioctave Frequency Coverage and Excellent Phase Noise Performance3/1/2020
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Analog Devices’ Latest PLL/VCO Device, the ADF4371, Delivers Groundbreaking Low Phase Noise and Spur Performance12/1/2019
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Negative Linear Regulator Features 0.8 µV RMS Noise and 74 dB Power Supply Rejection Ratio at 1 MHz9/1/2019
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Low Noise Silent Switcher μModule and LDO Regulators Improve Ultrasound Noise and Image Quality4/4/2022 Analog Dialogue
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How to Select the Best Power Solution for RF Signal Chain Phase Noise Performance12/1/2021
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Supply Clean Power with Ultralow Noise LDO Regulators9/1/2018
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Low Noise Power Supplies Come in Many Flavors: Part 1 - Linear Regulators3/23/2017
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Industry’s First 0.8µVRMS Noise LDO Has 79dB Power Supply Rejection Ratio at 1MHz4/1/2015 LT Journal
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Current Noise in FET Input Amps2/1/2020
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.
Models for the following parts are available in LTspice:
LT3045
LT3045-1
Reference Designs (3)
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.
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
LT3045 Discussions
RE: ADF4372: The function of internal LDO for VCO
4 week(s) ago in Clock and Timing
RE: What is the Vout max of the LT3045?
11 week(s) ago in Power Management
Sample & Buy
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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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.