Features and Benefits
- Output Current: 5A
- Dropout Voltage: 85mV Typical
- 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
- Enable Function Turns Output On/Off
- 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
The LT3070 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’s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost. The LT3070’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’s input. This tracking function drives the buck regulator to maintain the LT3070’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 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package.
- FPGA and DSP Supplies
- ASIC and Microprocessor Supplies
- Servers and Storage Devices
- Post Buck Regulation and Supply Isolation
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 1433 is an adjustable 5A linear regulator featuring the LT3070. The LT3070 is a low dropout 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’s high bandwidth permits the use of low ESR ceramic capacitors. Output voltage is digitally selectable in 50mV increments over a 0.8V to 1.8V range. The demo board has a 1.2V to 3V input voltage range and a 2.5V to 3.6V BIAS voltage range. A margining function allows the user to tolerance system output voltage in increments of ±1%, ±3% or ±5%. To maintain proper performance and regulation, the BIAS supply voltage must be higher than the IN supply voltage. For a given VOUT, the BIAS voltage must satisfy the following conditions: 2.2 ≤ VBIAS ≤ 3.6V and VBIAS ≥ (1.25 · VOUT + 1V).
For VOUT ≤ 0.95V, the minimum bias voltage is limited to 2.2V.
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:
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:
Product Selection Guide (1)
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.
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.