Overview
The LT3042EDD#PBF is a high-performance low dropout linear regulator produced by Analog Devices Inc. It features Analog Devices' ultralow noise and ultrahigh power supply rejection ratio (PSRR) architecture, making it ideal for powering noise-sensitive RF applications. The regulator is designed as a precision current reference followed by a high-performance voltage buffer, allowing it to be easily paralleled to reduce noise, increase output current, and spread heat on the PCB. It operates with a typical dropout voltage of 350mV and supplies up to 200mA of output current. The device has a wide output voltage range of 0V to 15V and is stable with a minimum 4.7µF ceramic output capacitor.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Input Voltage Range | 1.8V to 20V | V |
| Output Voltage Range | 0V to 15V | V |
| Output Current | 200mA | A |
| Dropout Voltage (Typical) | 350mV | mV |
| Quiescent Current (Typical) | 2mA | A |
| Quiescent Current in Shutdown | < 1µA | A |
| PSRR | 79dB at 1MHz | dB |
| Noise (RMS) | 0.8µVRMS (10Hz to 100kHz) | V |
| Noise (Spot) | 2nV/√Hz at 10kHz | V/√Hz |
| Bandwidth | 1MHz | Hz |
| Operating Temperature Range | -40°C to 125°C | °C |
| Package Type | 10-lead (3mm × 3mm) Plastic DFN |
Key Features
- Ultralow Noise and Ultrahigh PSRR: The LT3042 features ultralow RMS noise of 0.8µVRMS (10Hz to 100kHz) and ultrahigh PSRR of 79dB at 1MHz, making it suitable for noise-sensitive applications.
- Adjustable Output Voltage: The output voltage can be adjusted from 0V to 15V using a single resistor.
- Programmable Current Limit: The device includes a programmable current limit feature for added protection.
- Fast Start-Up and Power Good Indicator: It offers fast start-up capability and a programmable power good signal to indicate output voltage regulation.
- High Bandwidth: The regulator has a high bandwidth of 1MHz.
- Compact Package: The 10-lead (3mm × 3mm) plastic DFN package with an exposed pad enhances heat dissipation.
- Protection Features: Includes over-temperature and reverse polarity protection for reliability.
Applications
- RF Applications: Ideal for powering noise-sensitive RF applications such as mixers and low-noise amplifiers (LNAs).
- Instrumentation: Suitable for very low noise instrumentation.
- High Speed/High Precision Data Converters: Used in applications requiring high precision and low noise.
- Medical Applications: Applicable in medical imaging and diagnostic equipment.
- Precision Power Supplies: Used as post-regulators for switching supplies to improve noise and PSRR.
Q & A
- What is the typical dropout voltage of the LT3042?
The typical dropout voltage of the LT3042 is 350mV at 200mA output current.
- What is the output current capability of the LT3042?
The LT3042 can supply up to 200mA of output current.
- What is the PSRR of the LT3042 at 1MHz?
The PSRR of the LT3042 is 79dB at 1MHz.
- What is the noise performance of the LT3042?
The LT3042 has an ultralow RMS noise of 0.8µVRMS (10Hz to 100kHz) and ultralow spot noise of 2nV/√Hz at 10kHz.
- Can the LT3042 be paralleled to increase output current?
- What is the operating temperature range of the LT3042?
The operating temperature range of the LT3042 is -40°C to 125°C.
- What package type is the LT3042 available in?
The LT3042 is available in a 10-lead (3mm × 3mm) plastic DFN package with an exposed pad.
- Does the LT3042 have built-in protection features?
- How is the output voltage of the LT3042 adjusted?
The output voltage of the LT3042 can be adjusted using a single resistor.
- What is the quiescent current of the LT3042 in shutdown mode?
The quiescent current of the LT3042 drops to less than 1µA in shutdown mode.
