Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization
Features and Benefits
- 1A, 65V Power Switch
- Adjustable Switching Frequency
- Single Feedback Resistor Sets VOUT
- Synchronizable to External Clock
- High Gain SHDN Pin Accepts Slowly Varying Input Signals
- Wide Input Voltage Range: 2.55V to 40V
- Low VCESAT Switch: 400mV at 0.75A (Typical)
- Integrated Soft-Start Function
- Easily Configurable as a Boost, SEPIC, or Inverting Converter
- User Configurable Undervoltage Lockout (UVLO)
- Pin Compatible with LT3580
- Tiny Thermally Enhanced 8-Lead 3mm × 3mm DFN and 8-Lead MSOP Packages
The LT8580 is a PWM DC/DC converter containing an internal 1A, 65V switch. The LT8580 can be configured as either a boost, SEPIC or inverting converter.
The LT8580 has an adjustable oscillator, set by a resistor from the RT pin to ground. Additionally, the LT8580 can be synchronized to an external clock. The switching frequency of the part may be free running or synchronized, and can be set between 200kHz and 1.5MHz.
The LT8580 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable undervoltage lockout function.
Additional features such as frequency foldback and soft-start are integrated. The LT8580 is available in tiny thermally enhanced 3mm × 3mm 8-lead DFN and 8-lead MSOP packages.
- VFD Bias Supplies
- TFT-LCD Bias Supplies
- GPS Receivers
- DSL Modems
- Local Power Supply
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 (2)
Demonstration circuits 2186A-A and 2186A-B feature the LT8580EDD in boost/inverting configurations. The demo circuits demonstrate small size and low component count. The DC2186A-A boost demo board is designed to convert a 3V to 10V source to 12V at 120mA. The DC2186A-B two inductor inverting (Cuk) demo board converts a 5V to 12V source to –12V at 150mA. Please refer to figures in the manual for maximum load current at different input voltage levels.
Demonstration circuits 2186A-A and 2186A-B feature the LT8580EDD in boost/inverting configurations. The demo circuits demonstrate small size and low component count. The DC2186A-B two inductor inverting (Cuk) demo board converts a 5V to 12V source to –12V at 150mA. Please refer to the manual for maximum load current at different input voltage levels.
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.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
LTpowerCAD Project Files
Design tools for the following parts are available in LTpowerCAD:
LT8580 Companion Parts
Recommended Related Parts
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.