Datasheet LTC3109 (Analog Devices)

LTC3109 Auto-Polarity, Ultralow Voltage Step-Up Converter and Power Manager
FeaTures DescripTion
n
Operates from Inputs as Low as ±30mV
The LTC®3109 is a highly integrated DC/DC converter ideal n
Less Than ±1°C 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 VOUT of 2.35V, 3.3V, 4.1V or 5V
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-
applicaTions
cent current and high efficiency maximizes the harvested energy available for the application. n Remote Sensor and Radio Power n The LTC3109 is available in a small, thermally enhanced HVAC Systems n 20-lead (4mm × 4mm) QFN package and a 20-lead SSOP Automatic Metering n package. Building Automation n Predictive Maintenance 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. n Industrial Wireless Sensing *Patent pending.
Typical applicaTion
TEG (THERMOELECTRIC GENERATOR) 1nF ±30mV TO ±500mV
VOUT Current vs TEG Voltage
1:100 C1A • • VOUT2 OPTIONAL SWITCHED OUTPUT FOR SENSORS 900 470pF 1:100 TRANSFORMERS 3.3V 800 C1A = C1B = 1nF 47µF C2A VOUT + VOUT = 3.3V 2.2V 700 SWA VLDO 470µF V 2.2µF 600 INA LOW POWER 1nF LTC3109 RADIO 1:100 (µA) 500 • • C1B µP SENSOR(S) 400 470pF I VOUT 300 C2B PG00D 200 SWB VOUT2_EN V 100 INB 5.25V VAUX VS1 VSTORE 0 VS2 VAUX + –300 –200 –100 0 100 200 300 GND 1µF CSTORE VTEG (mV) 3109 TA01a 3109 TA01b 3109fb For more information www.linear.com/LTC3109 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts