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

Typical Application

LTC3109 Typical Application
LTC3109 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

For complete and up to date package information and drawings, please refer to our packaging page

QFN-20, SSOP-20

LTC3109 Package Drawing
LTC3109 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3109EGN#PBF SSOP 20 E $5.64 $3.95 View
LTC3109EGN#TRPBF SSOP 20 E $4.01 View
LTC3109EUF#PBF QFN 20 E $5.64 $3.95 View
LTC3109EUF#TRPBF QFN 20 E $4.01 View
LTC3109IGN#PBF SSOP 20 I $6.64 $4.65 View
LTC3109IGN#TRPBF SSOP 20 I $4.71 View
LTC3109IUF#PBF QFN 20 I $6.64 $4.65 View
LTC3109IUF#TRPBF QFN 20 I $4.71 View
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* 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 Linear Technology sales office or authorized distributor.

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. Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Remote Sensor and Radio Power
  • HVAC Systems
  • Automatic Metering
  • Building Automation
  • Predictive Maintenance
  • Industrial Wireless Sensing

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Design Tools

LTspiceIV

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Models for the following parts are available in LTspice IV:
LTC3109

Technical Support