LTC3108-1 Ultralow Voltage Step-Up Converter and Power Manager FeaT DescripT n Operates from Inputs of 20mV The LTC 3108-1 is a highly integrated DC/DC converter ideal n Complete Energy Harvesting Power for harvesting and managing surplus energy from extremely Management System low input voltage sources such as TEGs (thermoelectric - Selectable V of 2.5V, 3V, 3.7V or 4.5V generators), thermopiles and small solar cells. The step-up OUT - LDO: 2.2V at 3mA topology operates from input voltages as low as 20mV. - Logic Controlled Output Using a small step-up transformer, the LTC3108-1 provides - Reserve Energy Output a complete power management solution for wireless sens- n Power Good Indicator ing and data acquisition. The 2.2V LDO powers an external n Uses Compact Step-Up Transformers microprocessor, while the main output is programmed to n Small 12-Lead (3mm 4mm) DFN or 16-Lead one of four fixed voltages to power a wireless transmitter SSOP Packages or sensors. The power good indicator signals that the main output voltage is within regulation. A second output can be Ta enabled by the host. A storage capacitor provides power n Remote Sensors and Radio Power when the input voltage source is unavailable. Extremely n Surplus Heat Energy Harvesting low quiescent current and high efficiency design ensure n HVAC Systems the fastest possible charge times of the output reservoir n Industrial Wireless Sensing capacitor. The LTC3108-1 is functionally equivalent to the n Automatic Metering LTC3108 except for its unique fixed V options. OUT n Building Automation The LTC3108-1 is available in a small, thermally enhanced n Predictive Maintenance 12-lead (3mm 4mm) DFN package and a 16-lead SSOP L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear package. Technology Corporation. All other trademarks are the property of their respective owners. Typical Ta Wireless Remote Sensor Application Powered From a Peltier Cell V Charge Time OUT 1nF 1:100 1000 5.25V C1 VSTORE V = 3V OUT + + C = 470F + 0.1F OUT THERMOELECTRIC LTC3108-1 220F 6.3V 330pF GENERATOR 100 V OUT2 C2 PGOOD PGD P 20mV TO 500mV 2.2V SW VLDO 10 2.2F SENSORS 3V VS2 V OUT + RF LINK 1 470F 1:100 Ratio VS1 V 1:50 Ratio OUT2 EN 1:20 Ratio 31081 TA01a VAUX GND 0 0 50 100 150 200 250 300 350 400 V (mV) 1F IN 31081 TA01b 31081fb 1 For more information www.linear.com/LTC3108-1 TIME (sec) ion pplica ions pplica ion uresLTC3108-1 Ta e MaxiMMu Tar (Note 1) SW Voltage ..................................................0.3V to 2V VS1, VS2, VAUX, V , PGD ........................0.3V to 6V OUT C1 Voltage ....................................................0.3V to 6V VLDO, VSTORE ............................................0.3V to 6V C2 Voltage (Note 5) .........................................8V to 8V Operating Junction Temperature Range V , V ...........................................0.3V to 6V (Note 2) ................................................. 40C to 125C OUT2 OUT2 EN VAUX ....................................................15mA into VAUX Storage Temperature Range .................. 65C to 125C in p Fc T TOP VIEW TOP VIEW GND 1 16 GND VAUX 1 12 SW VAUX 2 15 SW VSTORE 2 11 C2 VSTORE 3 14 C2 V 3 10 C1 OUT 13 V 4 13 C1 OUT GND V 4 9 V OUT2 OUT2 EN V 5 12 V OUT2 OUT2 EN VLDO 5 8 VS1 VLDO 6 11 VS1 PGD 6 7 VS2 PGD 7 10 VS2 GND 8 9 GND DE PACKAGE 12-LEAD (4mm 3mm) PLASTIC DFN GN PACKAGE T = 125C, = 43C/W JMAX JA 16-LEAD PLASTIC SSOP NARROW EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB (NOTE 4) T = 125C, = 110C/W JMAX JA Der inFMTa LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3108EDE-1 PBF LTC3108EDE-1 TRPBF 31081 12-Lead (4mm 3mm) Plastic DFN 40C to 125C LTC3108IDE-1 PBF LTC3108IDE-1 TRPBF 31081 12-Lead (4mm 3mm) Plastic DFN 40C to 125C LTC3108EGN-1 PBF LTC3108EGN-1 TRPBF 31081 16-Lead Plastic SSOP 40C to 125C LTC3108IGN-1 PBF LTC3108IGN-1 TRPBF 31081 16-Lead Plastic SSOP 40C to 125C Consult LTC Marketing for parts specified for other fixed output voltages or wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: