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dc2103af
DEMO MANUAL DC2103A
Description
LTC3107EDD
Ultralow Voltage Energy Harvester
and Primary Battery Life Extender
Demonstration circuit 2103A featuring the LTC
®
3107 is a
highly integrated DC/DC converter designed to extend the
life of a primary battery in low power wireless systems by
harvesting and managing surplus energy from extremely
low input voltage sources such as thermoelectric gen
-
erators (TEG). The step-up topology operates from input
voltages as low as 20mV.
The DC2103A demonstration circuit has been optimized
for low start-up voltage with a 100:1 turns ratio trans
-
former. For applications where it is desirable to trade-off
a higher start-up voltage for higher current, a lower turns
ratio transformer can be used. Refer to the LTC3107 data
sheet for more information.
The LTC3107 is designed to accumulate and manage
energy from low voltage and low impedance sources
while providing battery backup with seamless transitions
between Energy Harvesting (EH) and battery power.
By utilizing the EH source when it is available, the life of
the battery can be extended by only taking energy from
the battery only when necessary. The battery backup also
ensures continuous power to the load. The demonstration
L, LT, LTC, LTM, Linear Technology, the Linear logo, Dust Networks and Dust are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
performance summary
circuit has been set up with battery terminals to allow for
different battery configurations to be used. Please con
-
sult the schematic for proper switch positioning. Space
is provided, and alternate part footprints have been built
into the PCB to allow experimentation with larger capaci
-
tors and different battery types for more energy storage.
Refer to the data sheet for more information including
equations to properly size the output capacitors for a
given application.
The DC2103A demo board also incorporates a connector
(J1) which can be used to connect to a Dust Networks
®
mote demo board
The LTC3107 data sheet has detailed information about
the operation, specification, and applications of the part.
The data sheet should be read in conjunction with this
Quick Start Guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2103A
Specifications are at T
A
= 25°C
PARAMETER CONDITIONS
Input Voltage Range 30mV to 500mV (Typical No Load Start-Up = 20mV)
VLDO 2.2V
VOUT Typically: VBAT – 30mV (Harvesting)
VBAT – 220mV (Not Harvesting)
VBAT 2V to 4V
VSTORE 4.3V (Clamped to VAUX)
