{"title":"Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger - bq24074","handle":"adafruit-universal-usb-dc-solar-lithium-ion-polymer-charger-bq24074","url":"/products/adafruit-universal-usb-dc-solar-lithium-ion-polymer-charger-bq24074","description":"The Adafruit Universal USB/DC/Solar Lithium Ion/Polymer Charger (bq24074) charges 3.7V/4.2V LiPo or LiIon batteries from virtually any power source — USB Type-C, DC adapter, or solar panel — with a wide 5–10V input range. Its near-MPPT solar tracking automatically draws the maximum current available from any panel in any light condition.\n\nSmart load sharing prioritises input power over battery power when available, preventing unnecessary charge/discharge cycles. The regulated LOAD output stays at 4.4V or below, making it safe for downstream 3.3V regulators or 5V boost converters.\n\nKey Features\n\n\nTriple Input – Charge via USB Type-C, DC jack (5–10V), or 6–10V solar panel; both USB and DC can be connected simultaneously\n\nUp to 1.5A Charge Rate – Default 1000 mA, adjustable to 500 mA or 1.5A via solder jumper\n\nNear-MPPT Solar Charging – Automatically tracks maximum current from any wattage solar panel\n\nSmart Load Sharing – Prioritises input power over battery to prevent cycling; up to 1.5A load output regulated to ≤4.4V\n\nWide Input Protection – Accepts 5–10V input, protected up to 28V\n\nStatus LEDs – Power Good (green) and Charging (red); charging LED turns off when complete\n\nOptional Temperature Monitoring – Solder in a 10K NTC thermistor for battery temperature protection (not included)\n\nJST Battery Connector – Standard 2-pin JST for Adafruit LiPo/LiIon batteries\n\n\nIdeal For\n\nSolar-powered outdoor projects and sensor stations\nPortable battery-powered devices\nUSB or DC-charged LiPo/LiIon projects\nIoT and remote monitoring systems\n\n\nPackage Contents\n\n1× Adafruit bq24074 Universal Charger (fully assembled)\n1× Header strip\n\n\n\nImportant: For use with Adafruit LiPo/LiIon batteries only. Other batteries may have different voltage, chemistry, polarity, or pinout. Battery and solar panel not included.\n\n\n\nNote: There is no \"Done\" LED on this charger — when the CHG LED turns off, charging is complete. For outdoor installations, consider adding a 10K NTC thermistor for battery temperature monitoring (recommended when battery may exceed 50°C or drop below 0°C).\n\n\nResources\n\nAdafruit bq24074 Charger Tutorial & Design Notes\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":3836,"title":"Default Title","sku":"AF-4755","price":30.83,"compare_at_price":0.0,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}