LTC3109 Auto-Polarity, Ultralow Voltage Step-Up Converter and Power Manager FeaT DescripT n Operates from Inputs as Low as 30mV The LTC 3109 is a highly integrated DC/DC converter ideal n Less Than 1C Needed Across TEG to Harvest for harvesting surplus energy from extremely low input Energy voltage sources such as TEGs (thermoelectric genera- n Proprietary Auto-Polarity Architecture tors) and thermopiles. Its unique, proprietary autopolarity n Complete Energy Harvesting Power Management topology* allows it to operate from input voltages as low System as 30mV, regardless of polarity. Selectable V of 2.35V, 3.3V, 4.1V or 5V OUT Using two compact step-up transformers and external 2.2V, 5mA LDO energy storage elements, the LTC3109 provides a com- Logic-Controlled Output plete power management solution for wireless sensing Energy Storage Capability for Operation During and data acquisition. The 2.2V LDO can power an external Power Interruption microprocessor, while the main output can be programmed n Power Good Indicator to one of four fixed voltages. The power good indicator n Uses Compact Step-up Transformers signals that the main output is within regulation. A second n Small, 20-lead (4mm 4mm) QFN Package or output can be enabled by the host. A storage capacitor (or 20-Lead SSOP 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 Ta energy available for the application. n Remote Sensor and Radio Power The LTC3109 is available in a small, thermally enhanced n HVAC Systems 20-lead (4mm 4mm) QFN package and a 20-lead SSOP n Automatic Metering package. n Building Automation n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Predictive Maintenance Technology Corporation. All other trademarks are the property of their respective owners. n Industrial Wireless Sensing *Patent pending. Typical Ta TEG (THERMOELECTRIC GENERATOR) 1nF V Current vs TEG Voltage 30mV TO 500mV OUT 1:100 C1A V OPTIONAL SWITCHED OUTPUT FOR SENSORS OUT2 900 1:100 TRANSFORMERS 470pF C1A = C1B = 1nF 3.3V 800 C2A V 47F OUT V = 3.3V OUT + 700 2.2V 470F SWA VLDO 600 V 2.2F LOW POWER INA 1nF RADIO LTC3109 500 1:100 C1B SENSOR(S) 400 P 470pF 300 C2B PG00D 200 SWB V OUT2 EN 100 V INB 5.25V VAUX VS1 VSTORE 0 VS2 VAUX + 300 200 100 0 300 100 200 1F C GND STORE V (mV) TEG 3109 TA01a 3109 TA01b 3109fb 1 For more information www.linear.com/LTC3109 I (A) VOUT ion pplica ions pplica ion uresLTC3109 Ta e MaxiMMu Tar (Note 1) SWA, SWB, V , V Voltage .................... 0.3V to 2V VLDO, VSTORE ............................................ 0.3V to 6V INA INB C1A, C1B Voltage ......................................... 0.3V to 6V VAUX ......................................................15mA Into V AUX C2A, C2B Voltage (Note 6) .............................. 8V to 8V Operating Junction Temperature Range V , V .......................................... 0.3V to 6V (Note 2) .................................................. 40C to 125C OUT2 OUT2 EN VS1, VS2, V , PGOOD .............................. 0.3V to 6V Storage Temperature Range .................. 65C to 125C OUT in p Fc T TOP VIEW TOP VIEW VS1 1 20 C1A 20 19 18 17 16 VS2 2 19 C2A VSTORE 3 18 GND VSTORE 1 15 SWA VAUX 2 14 V VAUX 4 17 SWA INA 21 V 3 13 V INB V 5 16 V OUT OUT INA GND V 4 12 SWB OUT2 V 6 15 V OUT2 INB GND V 5 11 OUT2 EN V 7 14 SWB OUT2 EN PGOOD 8 13 GND 6 7 8 9 10 VLDO 9 12 C2B GND 10 11 C1B UF PACKAGE GN PACKAGE 20-LEAD (4mm 4mm) PLASTIC QFN 20-LEAD PLASTIC SSOP T = 125C, = 37C/W JMAX JA T = 125C, = 90C/W JMAX JA EXPOSED PAD (PIN 21) IS GND (Note 5) Dro er Fni MTa LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3109EUF PBF LTC3109EUF TRPBF 3109 20-Lead (4mm 4mm) Plastic QFN 40C to 125C LTC3109IUF PBF LTC3109IUF TRPBF 3109 20-Lead (4mm 4mm) Plastic QFN 40C to 125C LTC3109EGN PBF LTC3109EGN TRPBF LTC3109GN 20-Lead Plastic SSOP 40C to 125C LTC3109IGN PBF LTC3109IGN TRPBF LTC3109GN 20-Lead Plastic SSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: