LTC3107_15 Datasheet, PDF (1/24 Pages) Linear Technology – Ultra-Low Voltage Energy Harvester and Primary Battery Life Extender

LTC3107
Features
Ultra-Low Voltage
Energy Harvester and
Primary Battery Life Extender
Description
n _{Thermal Energy Harvesting Assisted Power}
Management System
n _{VOUT Tracks the Primary Battery Voltage}
n _{2.2V LDO Output}
n _{Reserve Energy Output, Clamped to 4.3V}
n _{Operates from Inputs as Low as 20mV}
n _{Battery In-Use Indicator (BAT_OFF)}
n _{IQ from Battery:}
n _{80nA When Energy Harvesting}
n _{6µA No Energy Harvesting}
n _{Standard, Compact Step-Up Transformer}
n _{Small, Thermally Enhanced 10-lead (3mm × 3mm)}
DFN package
Applications
n _{Industrial Wireless Sensing}
n _{Remote Sensor and Radio power}
n _HVAC
n _{Automatic Metering}
n _{Building Automation, Security}
n _{Predictive Maintenance, Condition Monitoring}
The LTC^®3107 is a highly integrated DC/DC converter de-
signed to extend the life of a primary battery in low power
wireless systems by harvesting and managing surplus en-
ergy from extremely low input voltage sources such as TEGs
(Thermoelectric Generators) and thermopiles. The step-up
topology operates from input voltages as low as 20mV.
Using a small step-up transformer, the LTC3107
provides a complete power management solution for
typical wireless sensor applications that operate from a
primary battery. The 2.2V LDO can be used to power an
external microprocessor, while the main output voltage
automatically adapts to match the voltage of the primary
battery. The LTC3107 seamlessly transitions from battery
power to harvested power whenever harvested energy is
available, extending the life of the battery. The BAT_OFF
indicator can be used to track battery usage. An optional
storage capacitor accumulates excess harvested energy,
further extending battery life.
The LTC3107 is available in a small, thermally enhanced
10-lead (3mm × 3mm) DFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Typical Application
TEG Powered Thermal Harvester with Primary Cell Life Extender
THERMOELECTRIC
GENERATOR
T1
1nF
V_{IN 1:100}
C1
V_BAT
330pF
LTC3107
10µF
3.6V
C2
BAT_OFF
SW
V_OUT
GND
VLDO
VLDO
VAUX
VSTORE
2.2µF
+
10µF
CSTORE
(OPTIONAL)
3.6V
+
V_OUT
C_OUT
3107 TA01a
For more information www.linear.com/LTC3107
Percentage of Added Battery Life
vs TEG Surface Temperature
100000
T_A = 23°C
10000
1000
100
10
1
25
CUI CP20151 TEG
24×24×22mm HEATSINK
NATURAL CONVECTION
0.5Hz X_MT RATE (227µW AVG)
1Hz X_MT RATE (437µW AVG)
2Hz X_MT RATE (679µW AVG)
30
35
40
45
50
SURFACE TEMPERATURE (°C)
3107 TA01
3107f
1