集成电路LTC3331EUH

n Dual Input, Single Output DC/DC’s with Input  

Prioritizer 

Energy Harvesting Input: 3.0V to 18V Buck DC/DC

   Primary Cell Input: 1.8V to 5.5V Buck-Boost DC/DC

n Zero Battery IQ When Powering Load from 

Harvested Energy

n Ultralow Quiescent Current: 900nA at No-Load

n Low Noise LDO Post Regulator

n Integrated Supercapacitor Balancer

n Up to 50mA of Output Current

n Programmable DC/DC and LDO Output Voltages, 

Buck UVLO, and Buck-Boost Peak Input Current

n Integrated Low Loss Full-Wave Bridge Rectifier

n Input Protective Shunt–Up to 25mA at VIN ≥ 20V

n 5mm × 5mm QFN-32 Package

n Energy Harvesting

n Solar Powered Systems with Primary Cell Backup

n Wireless HVAC Sensors and Security DevICes

n Mobile Asset Tracking

The LTC? 3330 integrates a high voltage energy harvesting power supplyplus a DC/DCconverterpoweredby a primary cell battery to create a single output supply for alternative energy applications. The energy harvesting power supply, consisting of an integrated full-wave bridge rectifier and a high voltage buck converter, harvests energy from piezoelectric, solar, or magnetic sources. The primary cell input powers a buck-boost converter capable of operation down to 1.8V at its input. Either DC/DC converter can deliver energy to a single output. The buck operates when harvested energy is available, reducing the quiescent current draw on the battery to essentially zero. The buck-boost takes over when harvested energy goes away. A low noise LDO post regulator and a supercapacitor balancer are also integrated, accommodating a wide range of output storage configurations. Voltage and current settings for both inputs and outputs are programmable via pin-strapped logic inputs. TheLTC3330isavailablein a 5mm × 5mmQFN-32 package.

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