Features and Benefits
- Generates Two Independent Low Noise Bias Supplies
- Boost Regulator:
- Wide Input Voltage Range: 3V to 20V
- Adjustable Switching Frequency: 450kHz to 2MHz
- Synchronizable to External Clock
- 950mA Power Switches
- Integrated Schottky Diodes
- Internal Frequency Compensation
- Linear Regulator:
- Wide Output Voltage Range: 1V to 20V
- SET Pin Reference Current: 50μA
- Low Noise: 4μVRMS (10Hz to 100kHz)
- High Frequency PSRR: 72dB at 1MHz
- Independent Precision-Threshold Enable Pins
- Symmetric Pinout Simplifies PCB Layout
- Thermally Enhanced 3mm × 5mm 24-Lead QFN Package
The LT3095 generates two low-noise bias supplies from a common input voltage ranging from 3V to 20V. Each channel includes a fixed frequency, peak current-mode step-up switching regulator and a low-noise, singleresistor- programmable 50mA linear regulator. The linear regulator’s high power supply ripple rejection (PSRR) combined with its low-noise performance results in less than 100μVP-P output ripple and noise.
Each boost regulator adjusts its output voltage to 2V above the corresponding linear regulator’s output voltage, optimizing power dissipation, PSRR and transient response. This tracking scheme, along with internal boost regulator frequency compensation and integrated Schottky diodes, minimizes external component count and simplifies system design. Each linear regulator includes internal current limit and thermal limit protection circuitry.
The LT3095 switching frequency is externally programmable with a single resistor from 450kHz to 2MHz. A SYNC pin allows synchronization to an external clock. The LT3095 is available in a thermally enhanced, low profile (0.75mm) 24-lead 3mm × 5mm QFN package.
- Noise-Sensitive USB Powered Applications
- Data Conversion, Industrial Supplies, RF
- Instrumentation Amplifiers
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 2270A is a dual-channel low noise bias generator featuring LT3095. The LT3095 generates two low noise bias supplies from a common input voltage range from 3V to 20V. Each channel includes a fixed frequency, peak current mode step-up switching regulator and a low noise, single resistor programmable linear regulator. The maximum load current is 50mA for each channel, and the two output voltages are 5V and 15V.
Each boost regulator adjusts its output voltage to 2V above the corresponding linear regulator’s output voltage, optimizing power dissipation, PSRR and transient response.
Tools & Simulations
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:
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Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.