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Linear Technology Release A Complete Energy Harvesting Solution
The New LTC3331 Works With Piezoelectric, Solar, or Magnetic Energy Sources
Linear Technology Corporation has released the LTC3331, a complete energy harvesting solution
that delivers up to 50mA of continuous output current to extend battery life when harvestable energy is available.
A simple 10mA shunt enables charging of a rechargeable battery with harvested energy while a low battery disconnect
function protects the battery from deep discharge. The LTC3331 requires only 200nA of supply current from the
battery when providing regulated power to the load from harvested energy and only 950nA operating when powered
from the battery under no-load conditions.
The LTC3331 integrates a high voltage energy harvesting power supply, a battery charger, and a synchronous buckboost
DC/DC converter powered by a rechargeable battery, creating a single continuous regulated output for energy
harvesting applications such as those in wireless sensor networks. 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 (AC), solar (DC), or magnetic (AC) sources. When harvested energy is not available, the
rechargeable battery input powers a buck-boost converter that operates over the full battery voltage range up to 4.2V
and can regulate whether the input is above, below or equal to the output. The LTC3331 automatically transitions to
the battery when the harvesting source is no longer available.
The LTC3331's energy harvesting inputs operate from a voltage range of 3V to 19V AC or DC, making the device
ideal for a wide array of piezoelectric, solar, or magnetic energy sources. Its input undervoltage lockout threshold
settings are programmable between 3V and 18V, enabling the application to operate the energy harvesting source at
its peak power transfer point. Other features include pin-programmable output voltages and buck-boost peak current
limits, a supercapacitor balancer, and an input protective shunt (up to 25mA at Vin ≥ 20V)
Key Features of the LTC3331
- 10mA Shunt Battery Charger with Programmable Float Voltages: 3.45V, 4.0V, 4.1V, 4.2V
- Low Battery Disconnect
- Ultralow Quiescent Current: 950nA at No Load
- Integrated Supercapacitor Balancer
- Up to 50mA of Output Current
- Programmable DC/DC Output Voltage, Buck UVLO & Buck-Boost Peak Input Current
- Integrated Low-Loss Full-Wave Bridge Rectifier
- Input Protective Shunt: Up to 25mA at VIN ≥ 20V
- Dual Input, Single Output DC/DCs with Input Prioritizer
- Energy Harvesting Input: 3.0V to 19V Buck DC/DC
- Battery Input: Up to 4.2V Buck-Boost DC/DC
The company's Web site address is www.linear.com.
[Reprinted with kind permission from Linear Technology - Release Date: 23rd June, 2014]