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LT3070-1
5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator
Overview
Features and Benefits
- Output Current: 5A
- Dropout Voltage: 85mV Typical
- Enable Function Soft-Starts the Reference
- Digitally Programmable VOUT : 0.8V to 1.8V
- Digital Output Margining: ±1%, ±3% or ±5%
- Low Output Noise: 25μVRMS (10Hz to 100kHz)
- Parallel Multiple Devices for 10A or More
- Precision Current Limit: ±20%
- ±1% Accuracy Over Line, Load and Temperature
- Stable with Low ESR Ceramic Output Capacitors (15μF Minimum)
- High Frequency PSRR: 30dB at 1MHz
- VIOC Pin Controls Buck Converter to Maintain Low Power Dissipation and Optimize Efficiency
- PWRGD/UVLO/Thermal Shutdown Flag
- Current Limit with Foldback Protection
- Thermal Shutdown
- 28-Lead (4mm × 5mm × 0.75mm) QFN Package
Product Details
The LT3070-1 is a low voltage, Ultrafast™ transient response linear regulator. The device supplies up to 5A of output current with a typical dropout voltage of 85mV. A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS. The LT3070-1 EN pin controls the reference soft-start behavior in comparison to the LT3070 which controls the reference soft-start via the BIAS pin supply voltage. The LT3070-1’s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost. The LT3070-1’s features make it ideal for high performance FPGAs, microprocessors or sensitive communication supply applications.
Output voltage is digitally selectable in 50mV increments over a 0.8V to 1.8V range. A margining function allows the user to adjust system output voltage in increments of ±1%, ±3% or ±5%. The IC incorporates a unique tracking function to control a buck regulator powering the LT3070-1’s input. This tracking function drives the buck regulator to maintain the LT3070-1’s input voltage to VOUT + 300mV, minimizing power dissipation.
Internal protection includes UVLO, reverse-current protection, precision current limiting with power foldback and thermal shutdown. The LT3070-1 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package.
Applications
- FPGA and DSP Supplies
- ASIC and Microprocessor Supplies
- Servers and Storage Devices
- Post Buck Regulation and Supply Isolation
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.
Documentation
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:
LTpowerCAD
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Design tools for the following parts are available in LTpowerCAD:
Reference Materials
Solutions Bulletins & Brochures (1)
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.
Support & Discussions
LT3070-1 Discussions
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.
