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LTC3108 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3108 Datasheet(HTML) 1 Page - Linear Technology |
1 / 22 page LTC3108 3108fa Typical applicaTion DescripTion Ultralow Voltage Step-Up Converter and Power Manager The LTC®3108 is a highly integrated DC/DC converter ideal forharvestingandmanagingsurplusenergyfromextremely low input voltage sources such as TEGs (thermoelectric generators),thermopilesandsmallsolarcells.Thestep-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. Usingasmallstep-uptransformer,theLTC3108providesa completepowermanagementsolutionforwirelesssensing 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 orsensors.Thepowergoodindicatorsignalsthatthemain 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. Wireless Remote Sensor Application Powered From a Peltier Cell FeaTures applicaTions n Operates from Inputs of 20mV n 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 n Power Good Indicator n Uses Compact Step-Up Transformers n Small 12-Lead (3mm × 4mm) DFN or 16-Lead SSOP Packages n Remote Sensors and Radio Power n Surplus Heat Energy Harvesting n HVAC Systems n Industrial Wireless Sensing n Automatic Metering n Building Automation n Predictive Maintenance 3108 TA01a C1 20mV TO 500mV C2 SW VS2 VS1 VOUT2 PGOOD 2.2V 470µF PGD VLDO VSTORE + VOUT VOUT2_EN LTC3108 VAUX GND 0.1F 6.3V 5V 3.3V 1µF 1nF 220µF 1:100 330pF SENSORS RF LINK µP 2.2µF + + + THERMOELECTRIC GENERATOR VOUT Charge Time 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. VIN (mV) 10 1 100 1000 0 3108 TA01b 0 100 150 250 50 200 300 350 400 VOUT = 3.3V COUT = 470µF 1:100 Ratio 1:50 Ratio 1:20 Ratio |
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