LT3042
20V, 200mA, Ultralow Noise, Ultrahigh PSRR RF Linear Regulator
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Features
- Ultralow RMS Noise: 0.8μVRMS (10Hz to 100kHz)
- Ultralow Spot Noise: 2nV/√Hz at 10kHz
- Ultrahigh PSRR: 79dB at 1MHz
- Output Current: 200mA
- 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: 350mV
- 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: 4.7μF Ceramic
- Reverse Battery and Reverse Current Protection
- 10-Lead MSOP and 3mm × 3mm DFN Packages
- AEC-Q100 Qualified for Automotive Applications
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The LT3042 is a high performance low dropout linear regulator featuring LTC’s ultralow noise and ultrahigh PSRR architecture for powering noise sensitive RF applications. Designed as a precision current reference followed by a high performance voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB.
The device supplies 200mA at a typical 350mV dropout voltage. Operating quiescent current is nominally 2mA and drops to <<1μA in shutdown. The LT3042’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 LT3042 is stable with a minimum 4.7μF ceramic output capacitor. Built-in protection includes reverse battery protection, reverse current protection, internal current limit with foldback and thermal limit with hysteresis. The LT3042 is available in thermally enhanced 10-Lead MSOP and 3mm × 3mm DFN packages.
Applications
- RF Power Supplies: PLLs, VCOs, Mixers, LNAs
- Very Low Noise Instrumentation
- High Speed/High Precision Data Converters
- Medical Applications: Imaging, Diagnostics
- Precision Power Supplies
- Post-Regulator for Switching Supplies
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LT3042
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How to Get the Best Results Using LTspice for EMC Simulation—Part 2: Improving Signal Integrity
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Designing a Deployable 10BASE-T1L Single-Pair Ethernet Condition Monitoring Vibration Sensor
Using Linear Regulators as a Filter
Increasing Output Current of the Ultralow Noise, Ultrahigh PSRR LT3042 200mA Linear Regulator
Low Noise Power Supplies Come in Many Flavors: Part 1 - Linear Regulators
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Feb 4, 2020
- 20_0130
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Feb 4, 2020
- 20_0130
Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
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LT3042EMSE#TRPBF
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Jun 21, 2022
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Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
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Digital Power System Managers1 |
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RECOMMENDED FOR NEW DESIGNS |
4-Channel PMBus Power System Manager Featuring Accurate Input Current and Energy Measurement |
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Positive Linear Regulators (LDO)1 |
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RECOMMENDED FOR NEW DESIGNS |
150mA, Low Noise, LDO Micropower Regulators |
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| Parts | Product Life Cycle | Description |
|---|---|---|
|
RECOMMENDED FOR NEW DESIGNS |
20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator |
Evaluation Kits 3
AD-PAARRAY3552R-SL
RF Front-end GaN Power Amplifier Biasing, Protection, and Control Reference Design
Features and Benefits
- Designed to cover full Tx signal chains with integrated MCU and user-friendly GUI for faster and easier integration
- Supports fault event protection - overvoltage (OV), overcurrent (OC), and overtemperature (OT)
- Supports ultrafast sub-µs GaN gate voltage switching ~ (<1 µs)
- Supports ultrafast (<10 µs) fault event protection from detection up to GaN gate pinch-off
- Wide range of gate bias voltages from -10 V to +10 V
- Configurable power-up and power-down sequence
Product Detail
The AD-PAARRAY3552R-SL reference design provides control, protection, and proper biasing sequence for GaN power amplifier (PA) arrays. The design incorporates the AD3553R high-speed, dual-channel, 16-bit DAC to support the ultrafast sub-µs voltage settling time of GaN gates.
Key fault events, including overvoltage, overcurrent, and overtemperature, are effectively managed by the LTC7000, a static switch driver responsible for system fault protection.
The on-board MAX32666 ultralow-power ARM® Cortex®-M4 microprocessor provides essential debug and programming features for a comprehensive software development experience with the system. The system's firmware is built on ADI's open-source no-OS framework and includes a user-friendly graphical interface (GUI) for evaluation. Updates are easily applied through an SWD UART bootloader, streamlining prototyping.
The system can be powered by an external +48 V supply, requiring high current capabilities.
APPLICATIONS
- 5G massive MIMOs
- Macro base stations
| Fault Events | |
| Fault | Default Limit |
| Overvoltage | +55 V |
| Overcurrent | 3.5 A |
| Overtemperature | 75°C |
| Output Ports | |
| Port Name | No. of ports |
| GaN gate ports | 6 |
| +48 V Gan drain ports | 4 |
| +5 V ports | 5 |
| Enable ports | 2 |
| Power Supply | |
| External | +48 V DC at 5 A |
| Operating Conditions | |
| Temperature Range | 45°C to +75°C |
Resources
DC2429A
LT3042 Low Noise PLL/VCO Power Supply Board with Onboard 100MHz Reference Frequency
Product Detail
Demonstration Circuit 2429A is a PLL/VCO Supply and Reference Frequency Board that features the LT3042, an ultralow noise and ultrahigh PSRR RF linear regulator. When powered from a 6V to 20V lab or wall wart supply, the DC2429A produces four ultralow noise supplies using seven LT3042s. These supplies include a fixed 3.3V/800mA supply (four LT3042's in parallel), a fixed 5V/200mA supply, a fixed 3.3V/200mA supply that powers an onboard 100MHz ultralow jitter crystal oscillator, and an adjustable voltage (2.5V to 15V), 200mA supply ideal for powering external VCOs. The DC2429 ensures PLL/VCO evaluation meets data sheet performance.
Resources
DC2246B
LT3042EDD Demo Board | Ultralow Noise, Ultrahigh PSRR RF LDO, 3.8V ≤ VIN ≤ 20V, VOUT = 3.3V @ 200mA
Product Detail
DC2246B is a linear regulator demonstration circuit featuring the LT3042EDD, which is a 200mA, ultralow noise, and ultrahigh power supply rejection ratio (PSRR) RF low dropout (LDO) regulator with programmable current limit.
DC2246B operates over an input voltage range of 3.8V to 20V and is configured for 3.3V at its output. It features ultralow output voltage noise (0.8µVRMS from 10Hz to 100kHz) and very high PSRR (79dB at 1MHz).
Resources
Evaluation Kits3
Tools & Simulations 1
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.
Lt Spice
Reference Designs 2
CN0531
Programmable 20-Bit, Linear, Precision, Bipolar ± 5V DC Voltage Source
Circuits from the lab
Info:Circuits from the lab
Resources
Videos
2021-09-09
01:00
ADI's CN0531: Programmable 20-Bit Precision DC Voltage Source
2022-03-23
02:09
Precision Narrow Bandwidth Signal Chain Solutions
CN0555
USB-Powered, 433.92 MHz RF Low Noise Amplifier Receiver with Overpower Protection
Circuits from the lab
Info:Circuits from the lab
