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400mA Synchronous Step-Up DC/DC Converter with Maximum Power Point Control & 250mV Start Up for Energy Harvesting Applications
MILPITAS, CA - October 18, 2010 - Linear Technology announces
the LTC3105, a high performance, synchronous
boost converter that incorporates maximum power point control
(MPPC) and starts up with inputs as low as 250mV. The LTC3105
operates over an extremely wide input range of 0.2V to 5V, making
it ideal for harvesting energy from high impedance alternative
power sources, including photovoltaic cells, thermoelectric
generators (TEGs) and fuel cells. The LTC3105's internal 400mA
synchronous switches maximize efficiency while its Burst Mode®
operation offers quiescent current of only 22uA, further optimizing
converter efficiency over all operating conditions. A
user-programmable MPPC set point maximizes the energy that can be
extracted from any power source without collapsing its internal
voltage.
The LTC3105 is ideally suited to power wireless sensors and data
acquisition applications. Surplus or ambient energy can be
harvested and then used to generate system power in lieu of
traditional wired or battery power, which may be expensive or
impractical. Typically, these applications require very low average
power, but require periodic pulses of higher load current. For
example, the LTC3105 can be used in wireless sensor applications
where the power load is extremely low when the sensor is in standby
mode, interupted by periodic high load bursts, when the circuitry
is powered up to take measurements and transmit data.
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The LTC3105 offers an auxiliary LDO that delivers up to 6mA of
output current to power external microcontrollers and sensors while
the main output is charging. Once fully charged, the main output
can deliver voltages as high as 5.25V with up to 100mA of output
current. It can also regulate VOUT even when VIN is greater than or
equal to VOUT, offering further design flexibility. In shutdown,
the LTC3105 offers output disconnect, isolating VIN from VOUT,
requiring only 4uA of quiescent current. The combination of the
LT3105's 3mm x 3mm DFN package (or MSOP-12) and very small external
components offers a very compact solution for energy harvesting
applications. |
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Summary of Features: LTC3105
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Low Voltage Step-Up DC/DC Converter |
