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LTC3588-1 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3588-1 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LTC3109 1 3109fa TYPICAL APPLICATION FEATURES DESCRIPTION Auto-Polarity, Ultralow Voltage Step-Up Converter and Power Manager 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 genera- tors) 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 com- plete 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 quies- cent 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. VOUT Current vs TEG Voltage APPLICATIONS n Operates from Inputs as Low as ±30mV n Less Than ±1°C Needed Across TEG to Harvest Energy n Proprietary Auto-Polarity Architecture n 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 n Power Good Indicator n Uses Compact Step-up Transformers n Small, 20-lead (4mm × 4mm) QFN Package or 20-Lead SSOP n Remote Sensor and Radio Power n HVAC Systems n Automatic Metering n Building Automation n Predictive Maintenance n Industrial Wireless Sensing L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Patent pending. GND 1μF 5.25V 2.2V LTC3109 3.3V CSTORE 3109 TA01a C1A 1nF 2.2μF 470pF 47μF 1nF 470pF 1:100 TEG (THERMOELECTRIC GENERATOR) ±30mV TO ±500mV •• 1:100 •• VOUT2 C2A C1B C2B SWB VINB VS1 VS2 SWA VINA VOUT VLDO PG00D VOUT2_EN VSTORE VAUX VAUX + 470μF OPTIONAL SWITCHED OUTPUT FOR SENSORS + μP LOW POWER RADIO SENSOR(S) VTEG (mV) –300 0 100 300 400 500 100 900 3109 TA01b 200 –100 –200 200 0300 600 700 800 1:100 TRANSFORMERS C1A = C1B = 1nF VOUT = 3.3V |
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