LTC3108 - Ultralow Voltage Step-Up Converter and Power Manager
Features
- Operates from Inputs of 20mV
- Complete Energy Harvesting Power
- Management System
- 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
Typical Application
Description
The LTC®3108 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 |
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3108EDE#PBF | 4x3 DFN-12 | DE/UE | E | 05-08-1695 | Yes |
| LTC3108EDE#TRPBF | 4x3 DFN-12 | DE/UE | E | 05-08-1695 | Yes |
| LTC3108EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3108EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3108IDE#PBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LTC3108IDE#TRPBF | 4x3 DFN-12 | DE/UE | I | 05-08-1695 | Yes |
| LTC3108IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC3108IGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3108EDE#PBF | 4x3 DFN-12 | E | $4.22 | $2.95 | Yes | |
| LTC3108EDE#TRPBF | 4x3 DFN-12 | E | $3.01 | Yes | ||
| LTC3108EGN#PBF | SSOP-16 | E | $4.22 | $2.95 | Yes | |
| LTC3108EGN#TRPBF | SSOP-16 | E | $3.01 | Yes | ||
| LTC3108IDE#PBF | 4x3 DFN-12 | I | $4.93 | $3.45 | Yes | |
| LTC3108IDE#TRPBF | 4x3 DFN-12 | I | $3.51 | Yes | ||
| LTC3108IGN#PBF | SSOP-16 | I | $4.93 | $3.45 | Yes | |
| LTC3108IGN#TRPBF | SSOP-16 | I | $3.51 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1582B-A | LTC3108EDE Demo Board | Ultralow Voltage Step-Up Converter and Power Manager | $150.00 | |
| DC2042A | ENERGY HARVESTING (EH) MULTI-SOURCE DEMOBOARD | $200.00 | |
| DC2080A | Energy Harvesting (EH) Multi-Source Demo Board with Transducers | Contact Factory | |
| Buy Now | |||
Applications
- Remote Sensors and Radio Power
- Surplus Heat Energy Harvesting
- HVAC Systems
- Industrial Wireless Sensing
- Automatic Metering
- Building Automation
- Predictive Maintenance
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice does not automatically open after clicking the link above, 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
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice:
LTC3108
LTC3108-1
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
