LT3045-1
20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator with VIOC Control
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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
- VIOC Pin Controls Upstream Regulator to Minimize Power Dissipation
- Single Resistor Programs Output Voltage
- 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 3mm × 3mm DFN Packages
Product Details
The LT3045-1 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 LT3045-1 can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB. In addition to the LT3045 feature set, the LT3045-1 incorporates a VIOC tracking function to control an upstream switching converter to maintain a constant voltage across the LT3045-1 and hence minimize power dissipation.
The device supplies 500mA at a typical 260mV dropout voltage. Operating quiescent current is nominally 2.3mA and drops to <<1μA in shutdown. The LT3045-1’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 LT3045-1 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 LT3045-1 is available in thermally enhanced 12-Lead MSOP and 3mm × 3mm DFN packages.
| 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
- 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 (3)
Documentation & Resources
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R531 Reliability Data3/26/2018
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DC2637A - Demo Board Manual6/5/2018
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DC2593A - Demo Manual5/15/2017
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
Product Recommendations
LT3045-1 Companion Parts
Recommended Related Parts
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 |
|---|---|---|---|---|
| LT3045EDD-1#PBF | Material Declaration | Reliability Data | 12-Lead DFN (3mm x 3mm w/ EP) | |
| LT3045EDD-1#TRPBF | Material Declaration | Reliability Data | 12-Lead DFN (3mm x 3mm w/ EP) | |
| LT3045EMSE-1#PBF | Material Declaration | Reliability Data | 12-Lead MSOP w/ EP | |
| LT3045EMSE-1#TRPBF | Material Declaration | Reliability Data | 12-Lead MSOP w/ EP | |
| LT3045IDD-1#PBF | Material Declaration | Reliability Data | 12-Lead DFN (3mm x 3mm w/ EP) | |
| LT3045IDD-1#TRPBF | Material Declaration | Reliability Data | 12-Lead DFN (3mm x 3mm w/ EP) | |
| LT3045IMSE-1#PBF | Material Declaration | Reliability Data | 12-Lead MSOP w/ EP | |
| LT3045IMSE-1#TRPBF | Material Declaration | Reliability Data | 12-Lead MSOP w/ EP | |
| Wafer Fabrication Data | R531 Reliability Data |
PCN-PDN Information
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Support & Discussions
LT3045-1 Discussions
Sample & Buy
Ordering FAQs
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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
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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.