LTC3331 Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Charger FEATURESDESCRIPTION n Dual Input, Single Output DC/DCs with Input The LTC®3331 integrates a high voltage energy harvesting Prioritizer power supply plus a buck-boost DC/DC powered from a n Energy Harvesting Input: 3.0V to 19V Buck DC/DC rechargeable battery to create a single output supply for n Battery Input: Up to 4.2V Buck-Boost DC/DC alternative energy applications. A 10mA shunt allows simple n 10mA Shunt Battery Charger with Programmable charging of the battery with harvested energy while a low Float Voltages: 3.45V, 4.0V, 4.1V, 4.2V battery disconnect function protects the battery from deep n Low Battery Disconnect discharge. The energy harvesting power supply, consisting n Ultra Low Quiescent Current: 950nA at no Load of an integrated full-wave bridge rectifier and a high voltage n Integrated Supercapacitor Balancer buck DC/DC, harvests energy from piezoelectric, solar, or n Up to 50mA of Output Current magnetic sources. Either DC/DC converter can deliver en- n Programmable DC/DC Output Voltage, Buck UVLO, ergy to a single output. The buck operates when harvested and Buck-Boost Peak Input Current energy is available, reducing the quiescent current draw n Integrated Low-Loss Full-Wave Bridge Rectifier on the battery to the 200nA required by the shunt charger, n Input Protective Shunt: Up to 25mA at VIN ≥ 20V thereby extending the life of the battery. The buck-boost n 5mm × 5mm QFN-32 Package powers VOUT only when harvested energy is unavailable. A supercapacitor balancer is also integrated, allowing for APPLICATIONS increased energy storage. Voltage and current settings n Energy Harvesting for both inputs and outputs are programmable via pin- n Solar Powered Systems with Battery Backup strapped logic inputs. The LTC3331 is available in a 5mm n Wireless HVAC Sensors and Security Devices × 5mm QFN-32 package. n Mobile Asset Tracking L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION AC1 AC2 PIEZO 22µH + 3V TO 19V MIDE Charging a Battery with Harvested Energy VIN SW SOLAR V25W 22µF 1µF LTC3331 22µH PANEL 25V 6.3V SWA V – OUT 50mV/DIV 4.7µF, 6.3V CAP SWB AC-COUPLED V 1.8V TO 5V IN2 VOUT 50mA EH_ON 100k 4V/DIV CHARGE SCAP 47µF 0V BB_IN 10mF 6.3V 4.7µF 2.7V BAT_OUT I 6.3V BB_IN BAL 200mA/DIV 10mF 0A BAT_IN EH_ON 2.7V + Li-Ion 4.7µF 0A PGVOUT BATTERY 6.3V ICHARGE 2 OPTIONAL 1mA/DIV FLOAT[1:0] OUT[2:0] 3 ACTIVE ENERGY HARVESTER ENABLES LBSEL IPK[2:0] 3 CHARGING OF THE BATTERY IN SLEEP 4 100µs/DIV 3331 TA01b BAT = 3.6V SHIP UV[3:0] VOUT = 1.8V ILOAD = 50mA V GND IN3 0.1µF 6.3V 3331 TA01a 3331fc For more information www.linear.com/LTC3331 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
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