LT8490 High Voltage, High Current Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (MPPT) FeaTuresDescripTion n VIN Range: 6V to 80V The LT®8490 is a buck-boost switching regulator battery n VBAT Range: 1.3V to 80V charger that implements a constant-current constant- n Single Inductor Allows VIN Above, Below, or Equal voltage (CCCV) charging profile used for most battery to VBAT types, including sealed lead-acid (SLA), flooded, gel and n Automatic MPPT for Solar Powered Charging lithium-ion. The device operates from input voltages n Automatic Temperature Compensation above, below or equal to the output voltage and can be n No Software or Firmware Development Required powered by a solar panel or a DC power supply. On-chip n Operation from Solar Panel or DC Supply logic provides automatic maximum power point tracking n Input and Output Current Monitor Pins (MPPT) for solar powered applications. The LT8490 can n Four Integrated Feedback Loops perform automatic temperature compensation by sensing n Synchronizable Fixed Frequency: 100kHz to 400kHz an external thermistor thermally coupled to the battery. n 64-Lead (7mm × 11mm × 0.75mm) QFN Package STATUS and FAULT pins containing charger information can be used to drive LED indicator lamps. The device is applicaTions available in a low profile (0.75mm) 7mm × 11mm 64-lead n QFN package. Solar Powered Battery Chargers n Multiple Types of Lead-Acid Battery Charging L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Li-Ion Battery Charger n Battery Equipped Industrial or Portable Military Equipment Typical applicaTionSimplified Solar Powered Battery Charger SchematicMaximum Power Point Tracking FULL PANEL SCAN GATEVCC´ GATEVCC´ VPANEL 6V/DIV SOLAR PANEL PERTURB & PERTURB & LOAD TG1 BOOST1 SW1 BG1 CSP CSN BG2 SW2 BOOST2 TG2 OBSERVE OBSERVE IPANEL VBAT 1.36A/DIV CSNIN CSPOUT CSPIN CSNOUT + – VIN EXTVCC RECHARGABLE BATTERY 8490 TA01b 0.5s/DIV LT8490 AVDD GATEVCC´ BACK PAGE APPLICATION TEMPSENSE THERMISTOR GATEVCC INTVCC STATUS FAULT GND AVDD AVDD 8490 TA01a 8490fa For more information www.linear.com/LT8490 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
