LTC3108
Ultralow Voltage Step-Up
Converter and Power Manager
Features Description Operates from Inputs of 20mV
n Complete Energy Harvesting Power
Management System -Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V -LDO: 2.2V at 3mA -Logic Controlled Output -Reserve Energy Output
n Power Good Indicator
n Uses Compact Step-Up Transformers
n Small 12-Lead (3mm Г— 4mm) DFN or 16-Lead
SSOP Packages The LTCВ®3108 is a highly integrated DC/DC converter ideal
for harvesting and managing surplus energy from extremely
low input voltage sources such as TEGs (thermoelectric
generators), thermopiles and small solar cells. The step-up
topology operates from input voltages as low as 20mV.
The LTC3108 is functionally equivalent to the LTC3108-1
except for its unique fixed VOUT options. n Using a small step-up transformer, the LTC3108 provides a
complete power management solution for wireless sensing
and data acquisition. The 2.2V LDO powers an external
microprocessor, while the main output is programmed to
one of four fixed voltages to power a wireless transmitter
or sensors. The power good indicator signals that the main
output voltage is within regulation. A second output can be
enabled by the host. A storage capacitor provides power …