LTC3108 Datasheet | Linear Technology

LTC3108 Ultralow Voltage Step-Up Converter and Power Manager Features nn Operates from Inputs of 20m V nn plete Energy Harvesting Power Management System nn Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V nn LDO: 2.2V at 3m A nn Logic Controlled Output nn Reserve Energy Output nn Power Good Indicator nn Uses pact Step-Up Transformers nn Small 12-Lead (3mm × 4mm) DFN or 16-Lead SSOP Packages APPLICATIONS nn Remote Sensors and Radio Power nn Surplus Heat Energy Harvesting nn HVAC Systems nn Industrial Wireless Sensing nn Automatic Metering nn Building Automation nn Predictive Maintenance All registered trademarks and trademarks are the property of their respective owners. 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 20m V. 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 plete 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. TYPICAL APPLICATION Wireless Remote Sensor Application Powered From a Peltier Cell THERMOELECTRIC GENERATOR ++ 1:100 220µF 20m V TO 500m V 1n F 330p F C1 VSTORE 5V +...