LTC3109 - Auto-Polarity, Ultralow Voltage Step-Up Converter and Power Manager
Features
- Operates from Inputs as Low as ±30mV
- Less Than ±1°C Needed Across TEG to Harvest Energy
- Proprietary Auto-Polarity Architecture
- Complete Energy Harvesting Power Management System
– Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V
– 2.2V, 5mA LDO
– Logic-Controlled Output
– Energy Storage Capability for Operation During Power Interruption - Power Good Indicator
- Uses Compact Step-up Transformers
- Small, 20-lead (4mm × 4mm) QFN Package or 20-Lead SSOP
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3109 is a highly integrated DC/DC converter ideal for harvesting surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators) and thermopiles. Its unique, proprietary autopolarity topology* allows it to operate from input voltages as low as 30mV, regardless of polarity.
Using two compact step-up transformers and external energy storage elements, the LTC3109 provides a complete power management solution for wireless sensing and data acquisition. The 2.2V LDO can power an external microprocessor, while the main output can be programmed to one of four fixed voltages. The power good indicator signals that the main output is within regulation. A second output can be enabled by the host. A storage capacitor (or battery) can also be charged to provide power when the input voltage source is unavailable. Extremely low quiescent current and high efficiency maximizes the harvested energy available for the application.
The LTC3109 is available in a small, thermally enhanced 20-lead (4mm × 4mm) QFN package and a 20-lead SSOP package.
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 |
|---|---|---|---|---|---|
| LTC3109EGN#PBF | SSOP-20 | GN | E | 05-08-1641 (GN20) | Yes |
| LTC3109EGN#TRPBF | SSOP-20 | GN | E | 05-08-1641 (GN20) | Yes |
| LTC3109EUF#PBF | 4x4 QFN-20 | UF | E | 05-08-1710 | Yes |
| LTC3109EUF#TRPBF | 4x4 QFN-20 | UF | E | 05-08-1710 | Yes |
| LTC3109IGN#PBF | SSOP-20 | GN | I | 05-08-1641 (GN20) | Yes |
| LTC3109IGN#TRPBF | SSOP-20 | GN | I | 05-08-1641 (GN20) | Yes |
| LTC3109IUF#PBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
| LTC3109IUF#TRPBF | 4x4 QFN-20 | UF | I | 05-08-1710 | 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 | |
|---|---|---|---|---|---|---|
| LTC3109EGN#PBF | SSOP-20 | E | $5.64 | $3.95 | Yes | |
| LTC3109EGN#TRPBF | SSOP-20 | E | $4.01 | Yes | ||
| LTC3109EUF#PBF | 4x4 QFN-20 | E | $5.64 | $3.95 | Yes | |
| LTC3109EUF#TRPBF | 4x4 QFN-20 | E | $4.01 | Yes | ||
| LTC3109IGN#PBF | SSOP-20 | I | $6.64 | $4.65 | Yes | |
| LTC3109IGN#TRPBF | SSOP-20 | I | $4.71 | Yes | ||
| LTC3109IUF#PBF | 4x4 QFN-20 | I | $6.64 | $4.65 | Yes | |
| LTC3109IUF#TRPBF | 4x4 QFN-20 | I | $4.71 | 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 |
|---|---|---|---|
| DC1664A | LTC3109EUF Demo Board | Autopolarity, Ultralow Voltage Step-Up Converter and Power Manager | $150.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3109IGN#PBF | SSOP-20 | I | $6.64 | $4.65 | Yes | |
| LTC3109IGN#TRPBF | SSOP-20 | I | $4.71 | Yes | ||
| LTC3109IUF#PBF | 4x4 QFN-20 | I | $6.64 | $4.65 | Yes | |
| LTC3109IUF#TRPBF | 4x4 QFN-20 | I | $4.71 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Remote Sensor and Radio Power
- HVAC Systems
- Automatic Metering
- Building Automation
- Predictive Maintenance
- Industrial Wireless Sensing
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LTC3109
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.
