LTC3331 Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Charger FEATURES DESCRIPTION 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 V 20V thereby extending the life of the battery. The buck-boost IN n 5mm 5mm QFN-32 Package powers V only when harvested energy is unavailable. OUT A supercapacitor balancer is also integrated, allowing for APPLICATIONS increased energy storage. Voltage and current settings n for both inputs and outputs are programmable via pin- Energy Harvesting n strapped logic inputs. The LTC3331 is available in a 5mm Solar Powered Systems with Battery Backup n 5mm QFN-32 package. Wireless HVAC Sensors and Security Devices n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Mobile Asset Tracking PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION AC1 AC2 PIEZO 22H + 3V TO 19V Charging a Battery with Harvested Energy MIDE V SW IN V25W SOLAR 22H LTC3331 22F 1F PANEL SWA 25V 6.3V V OUT 50mV/DIV CAP SWB 4.7F, 6.3V AC-COUPLED 1.8V TO 5V V V IN2 OUT EH ON 50mA 4V/DIV 100k 0V CHARGE SCAP 47F 6.3V BB IN 10mF 4.7F 2.7V I BAT OUT BB IN 6.3V BAL 200mA/DIV 10mF 0A 2.7V BAT IN EH ON 0A 4.7F Li-Ion + PGVOUT I CHARGE BATTERY 6.3V OPTIONAL 1mA/DIV 2 3 FLOAT 1:0 OUT 2:0 ACTIVE ENERGY HARVESTER ENABLES 3 CHARGING OF THE BATTERY IN SLEEP LBSEL IPK 2:0 3331 TA01b BAT = 3.6V 100s/DIV 4 SHIP UV 3:0 V = 1.8V OUT I = 50mA LOAD V IN3 0.1F GND 6.3V 3331 TA01a 3331fc For more information www.linear.com/LTC3331 1LTC3331 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V IN Low Impedance Source ..........................0.3 to 19V* Current-Fed, I = 0A ........................................25mA SW AC1, AC2 .............................................................0 to V IN 32 31 30 29 28 27 26 25 BB IN, V , V , BAT IN, SCAP, PGVOUT, BAL 1 24 FLOAT0 OUT IN3 SCAP 2 23 FLOAT1 CHARGE, SHIP ................................................0.3 to 6V V LBSEL 3 22 IN2 BAT OUT ....0.3V to Lesser of (BAT IN + 0.3V) or 6V UV3 4 21 BAT IN 33 V ....................0.3V to Lesser of (V + 0.3V) or 6V IN2 IN GND UV2 5 20 BAT OUT CAP ...................... Higher of 0.3V or (V 6V) to V IN IN UV1 6 19 IPK2 BAL ............................................0.3V to (SCAP + 0.3V) UV0 7 18 IPK1 OUT 2:0 .......... 0.3V to Lesser of (V + 0.3V) or 6V AC1 8 17 IPK0 IN3 IPK 2:0 ........... 0.3V to Lesser of (V + 0.3V) or 6V 9 10 11 12 13 14 15 16 IN3 EH ON ............. 0.3V to Lesser of (V + 0.3V) or 6V IN3 FLOAT 1:0 ...0.3V to Lesser of (BB IN + 0.3V) or 6V UH PACKAGE LBSEL ...........0.3V to Lesser of (BB IN + 0.3V) or 6V 32-LEAD (5mm 5mm) PLASTIC QFN UV 3:0 ............ 0.3V to Lesser of (V + 0.3V) or 6V T = 125C, = 44C/W IN2 JMAX JA EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB I , I ..............................................................50mA AC1 AC2 I , I , I ..................................................350mA SWA SWB VOUT I .......................................................................500mA SW Operating Junction Temperature Range (Notes 2, 3) ............................................ 40C to 125C Storage Temperature Range .................. 65C to 150C *V has an internal 20V clamp IN ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3331EUH PBF LTC3331EUH TRPBF 3331 32-Lead (5mm 5mm) Plastic QFN 40C to 85C LTC3331IUH PBF LTC3331IUH TRPBF 3331 32-Lead (5mm 5mm) Plastic QFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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