Datasheet LTC3108 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Ultralow Voltage Step-Up Converter and Power Manager |
| Pages / Page | 22 / 1 — FEATURES. DESCRIPTION. Operates from Inputs of 20mV. Complete Energy … |
| File Format / Size | PDF / 643 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Operates from Inputs of 20mV. Complete Energy Harvesting Power. Management System
Model Line for this Datasheet
Text Version of Document
LTC3108 Ultralow Voltage Step-Up Converter and Power Manager
FEATURES DESCRIPTION
n
Operates from Inputs of 20mV
The LTC®3108 is a highly integrated DC/DC converter n
Complete Energy Harvesting Power
ideal for harvesting and managing surplus energy from
Management System
extremely low input voltage sources such as TEGs (ther- n
Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V
moelectric generators), thermopiles and small solar cells. n
LDO: 2.2V at 3mA
The step-up topology operates from input voltages as n
Logic Controlled Output
low as 20mV. The LTC3108 is functionally equivalent to n
Reserve Energy Output
the LTC3108-1 except for its unique fixed VOUT options. n
Power Good Indicator
Using a small step-up transformer, the LTC3108 provides n Uses Compact Step-Up Transformers a complete power management solution for wireless n Small 12-Lead (3mm × 4mm) DFN or 16-Lead sensing and data acquisition. The 2.2V LDO powers an SSOP Packages external microprocessor, while the main output is pro- grammed to one of four fixed voltages to power a wire-
APPLICATIONS
less transmitter or sensors. The power good indicator n Remote Sensors and Radio Power signals that the main output voltage is within regulation. n Surplus Heat Energy Harvesting A second output can be enabled by the host. A storage n HVAC Systems capacitor provides power when the input voltage source n Industrial Wireless Sensing is unavailable. Extremely low quiescent current and high n Automatic Metering efficiency design ensure the fastest possible charge times n Building Automation of the output reservoir capacitor. n Predictive Maintenance The LTC3108 is available in a small, thermally enhanced All registered trademarks and trademarks are the property of their respective owners. 12-lead (3mm × 4mm) DFN package and a 16-lead SSOP package.
TYPICAL APPLICATION Wireless Remote Sensor Application Powered From a Peltier Cell VOUT Charge Time
1nF 1:100 5V C1 VSTORE 1000 + + + V 0.1F OUT = 3.3V THERMOELECTRIC LTC3108 C 220µF 6.3V OUT = 470µF 330pF GENERATOR C2 VOUT2 100 PGOOD 20mV TO 500mV PGD 2.2V µP SW VLDO 2.2µF SENSORS 10 TIME (sec) VS2 V 3.3V OUT + RF LINK 470µF 1 VS1 1:100 Ratio VOUT2_EN 1:50 Ratio 3108 TA01a VAUX GND 1:20 Ratio 0 0 50 100 150 200 250 300 350 400 1µF VIN (mV) 3108 TA01b Rev. D Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Operates from Inputs of 20mV
The LTC®3108 is a highly integrated DC/DC converter n
Complete Energy Harvesting Power
ideal for harvesting and managing surplus energy from
Management System
extremely low input voltage sources such as TEGs (ther- n
Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V
moelectric generators), thermopiles and small solar cells. n
LDO: 2.2V at 3mA
The step-up topology operates from input voltages as n
Logic Controlled Output
low as 20mV. The LTC3108 is functionally equivalent to n
Reserve Energy Output
the LTC3108-1 except for its unique fixed VOUT options. n
Power Good Indicator
Using a small step-up transformer, the LTC3108 provides n Uses Compact Step-Up Transformers a complete power management solution for wireless n Small 12-Lead (3mm × 4mm) DFN or 16-Lead sensing and data acquisition. The 2.2V LDO powers an SSOP Packages external microprocessor, while the main output is pro- grammed to one of four fixed voltages to power a wire-
APPLICATIONS
less transmitter or sensors. The power good indicator n Remote Sensors and Radio Power signals that the main output voltage is within regulation. n Surplus Heat Energy Harvesting A second output can be enabled by the host. A storage n HVAC Systems capacitor provides power when the input voltage source n Industrial Wireless Sensing is unavailable. Extremely low quiescent current and high n Automatic Metering efficiency design ensure the fastest possible charge times n Building Automation of the output reservoir capacitor. n Predictive Maintenance The LTC3108 is available in a small, thermally enhanced All registered trademarks and trademarks are the property of their respective owners. 12-lead (3mm × 4mm) DFN package and a 16-lead SSOP package.
TYPICAL APPLICATION Wireless Remote Sensor Application Powered From a Peltier Cell VOUT Charge Time
1nF 1:100 5V C1 VSTORE 1000 + + + V 0.1F OUT = 3.3V THERMOELECTRIC LTC3108 C 220µF 6.3V OUT = 470µF 330pF GENERATOR C2 VOUT2 100 PGOOD 20mV TO 500mV PGD 2.2V µP SW VLDO 2.2µF SENSORS 10 TIME (sec) VS2 V 3.3V OUT + RF LINK 470µF 1 VS1 1:100 Ratio VOUT2_EN 1:50 Ratio 3108 TA01a VAUX GND 1:20 Ratio 0 0 50 100 150 200 250 300 350 400 1µF VIN (mV) 3108 TA01b Rev. D Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
