Low IQ Boost/SEPIC/Inverting Converter with 1A, 60V Switch
Features and Benefits
- 3V to 25V Input Voltage Range
- Ultralow Quiescent Current and Low Ripple Burst Mode® Operation: IQ = 6μA
- 2A, 28V Power Switch
- Positive or Negative Output Voltage Programming with a Single Feedback Pin
- Fixed 2MHz Switching Frequency
- Programmable Undervoltage Lockout (UVLO)
- Internal Compensation and Soft-Start
- Low Profile (0.75mm) 8-Lead (3mm × 2mm) DFN Package
The LT8335 is a current mode DC/DC converter capable of generating either positive or negative output voltages using a single feedback pin. It can be configured as a boost, SEPIC or inverting converter consuming as low as 6μA of quiescent current. Low ripple Burst Mode operation maintains high efficiency down to very low output currents while keeping the output ripple below 15mV in a typical application. The internally compensated current mode architecture results in stable operation over a wide range of input and output voltages. Integrated soft-start and frequency foldback functions are included to control inductor current during start-up. The 2MHz operation combined with the small 8-lead DFN package, enables low cost, area efficient solutions.
- Industrial and Automotive
- Medical Diagnostic Equipment
- Portable Electronics
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 2449A-A and 2449A-B feature the LT8335, in boost and inverting configurations. The demo circuits demonstrate small size and low component count. The boost is designed to convert a 3V to 10V input source to 12V at 275mA. The inverter converts a 4.5V to 13V source to –12V at 350mA. Refer to Figures 4 and 5 in the manual for maximum load current at different input voltage levels.
Demonstration circuits 2449A-A and 2449A-B feature the LT8335, in boost and inverting configurations. The demo circuits demonstrate small size and low component count. The boost is designed to convert a 3V to 10V input source to 12V at 275mA. The inverter converts a 4.5V to 13V input source to –12V at 350mA. Refer to Figures 4 and 5 in 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.
Design tools for the following parts are available in LTpowerCAD:
LT8335 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.