Features and Benefits
- Operates from Inputs of 20mV
- Complete Energy Harvesting Power
- Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V
- LDO: 2.2V at 3mA
- Logic Controlled Output
- Reserve Energy Output
- Power Good Indicator
- Uses Compact Step-Up Transformers
- Small 12-Lead (3mm × 4mm) DFN or 16-Lead SSOP Packages
The LTC3108 is a highly integrated DC/DC converter ideal for harvesting and managing surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators), thermopiles and small solar cells. The step-up topology operates from input voltages as low as 20mV. The LTC3108 is functionally equivalent to the LTC3108-1 except for its unique fixed VOUT options.
Using a small step-up transformer, the LTC3108 provides a complete power management solution for wireless sensing and data acquisition. The 2.2V LDO powers an external microprocessor, while the main output is programmed to one of four fixed voltages to power a wireless transmitter or sensors. The power good indicator signals that the main output voltage is within regulation. A second output can be enabled by the host. A storage capacitor provides power when the input voltage source is unavailable. Extremely low quiescent current and high efficiency design ensure the fastest possible charge times of the output reservoir capacitor.
The LTC3108 is available in a small, thermally enhanced 12-lead (3mm × 4mm) DFN package and a 16-lead SSOP package.
|Output Voltage (Switcher)|
|LTC3108||Selectable 2.35V, 3.3V, 4.1V or 5V|
|LTC3108-1||Selectable 2.5V, 3V, 3.7V or 4.5V|
- Remote Sensors and Radio Power
- Surplus Heat Energy Harvesting
- HVAC Systems
- Industrial Wireless Sensing
- Automatic Metering
- Building Automation
- Predictive Maintenance
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 (3)
The DC2080 is a versatile energy harvesting demo board that is capable of accepting piezoelectric, solar, 4mA to 20mA loops, thermal powered energy sources or any high impedance AC or DC source. The board contains four independent circuits consisting of the following EH ICs:
- LTC3588-1: Piezoelectric Energy Harvesting Power Supply
- LTC3108: Ultralow Voltage Step-Up Converter and Power Manager
- LTC3105: Step-Up DC/DC Converter with Power Point Control and LDO Regulator
- LTC3459: 10V Micropower Synchronous Boost Converter
- LTC2935-2 and LTC2935-4: Ultralow Power Supervisor with Power-Fail Output Selectable Thresholds
The board is designed to connect to the Energy Micro STK development kit. It also includes two energy harvester transducers (TEG and Solar) and a terminal block for connecting a high impedance AC source. In addition, many turrets are provided, making it easy to connect additional transducers to the board. The board contains multiple jumpers that allow the board to be configured in various ways. The standard build for the board has 4 jumpers installed out of the possible 12 jumpers. The board is very customizable to the end users’ needs. This compatibility makes it a perfect evaluation tool for any low power energy harvesting system. Please refer to the individual data sheets for the operation of each power management circuit. The application section of this demo manual describes the system level functionality of this board and the various ways it can be used in early design prototyping.
DC2042A - Demo Board for:
LTC3588-1 Piezoelectric Energy Harvesting Power Supply
LTC3108 Ultralow Voltage Step-Up Converter and Power Manager
LTC3105 400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up
LTC3459 10V Micropower Synchronous Boost Converter in ThinSOT
LTC2935 Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
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:
LTC3108 Companion Parts
Recommended Related Parts
Solutions Bulletins & Brochures (1)
Press Release (1)
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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.