Power Harvester chip mediates power for wireless nodes
2013/08/08
Applications are expected powering wireless sensors
The firm boldy claims that it drawn no power at all from the primary cell when harvested energy is available (which is translated to an creditable 10nA max in the data sheet), and only 750nA of operating current when powered from the battery with no load.
3-19V ac or dc can be applied to the harvesting input, 1.8-5.5V from the primary cell, and 1.2-5V can be delivered to the output, and a local capacitive storage network, are through a number f power switches, a buck converter, and a buck-boost converter. A built-in 25mA 20V Zener clamp stops the harvester from taking the chip out.
A supercapacitor holds up the, and if two 2.5V supercaps have to be used in series a balancing circuit is built in to prevent over-voltage on either of them.
“The energy harvesting power supply, consisting of a full-wave bridge rectifier accommodating ac or dc inputs and a high efficiency buck converter, harvests energy from piezoelectric, solar or magnetic sources,” said Linear. “The primary cell input powers a buck-boost converter that operates from 1.8V to 5.5V at its input when harvested energy is not available to regulate the output whether the input is above, below or equal to the output.”
Fixed output voltages of: 1.8, 2.5, 2.8, 3.0, 3.3, 3.6, 4.5 or 5V can be pin-programmed.
Input under-voltage lockout threshold settings are programmable between 3 and 18V.
Other features include programmable dc-dc and LDO output voltages and buck-boost peak current limits
LTC3330EUH comes in a 5x5mm QFN-32.
An industrial temperature grade version,30IUH, is also available.
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