{"product_id":"adafruit-bq25185-usb-dc-solar-charger-with-3-3v-buck-board","title":"Adafruit bq25185 USB \/ DC \/ Solar Charger with 3.3V Buck Board","description":"\u003cp\u003eWe're always on the lookout for better ways to make projects portable: being able to charge your battery in the most convenient manner will let projects run no matter what power is available. Then we added a power supply chip with it to let you run your project without a separate board. The result is the Adafruit bq25185 USB \/ DC \/ Solar Charger with a 3.3V Buck Board!\u003c\/p\u003e\n\u003cp\u003eIt uses the new \u003ca href=\"https:\/\/www.ti.com\/product\/BQ25185\"\u003ebq25185\u003c\/a\u003e is a nifty charger chip with fairly high charge current, power path support, and the ability to charge from USB, DC or solar power. It's also a great value, so it's a good upgrade from \u003ca href=\"\/hi\/products\/adafruit-usb-liion-lipoly-charger\" title=\"USB LiIon\/LiPoly charger (v1.2)\"\u003eMCP73833\u003c\/a\u003e or \u003ca href=\"\/hi\/products\/adafruit-micro-lipo-charger-for-lipoly-batt-with-usb-type-c-jack\" title=\"Adafruit Micro-Lipo Charger for LiPoly Batt with USB Type C Jack\"\u003eMCP73831\u003c\/a\u003e-based charger boards. The buck converter is the \u003ca href=\"\/hi\/products\/adafruit-ap3429a-3-3v-buck-converter-breakout-3-3v-output-1-2a-max\" title=\"TLV62569 3.3V Buck Converter Breakout - 3.3V Output 1.2A Max\"\u003eTPS62569\u003c\/a\u003e, which will give a clean 1 Amp output with good efficiency, to squeeze the most power possible out of your battery.\u003c\/p\u003e\n\u003cp\u003eThis board is meant to be everything you need to power your 3.3V electronics: simply connect a \u003ca href=\"\/hi\/search?q=3.7+lipo+battery\u0026amp;narrow_by=\u0026amp;sort_by=relevency\u0026amp;page=1\" title=\"3.7 lipo battery\"\u003e500mAh or larger battery\u003c\/a\u003e to the JST PH 2-pin port, then charge it when you can from USB or DC\/solar. At the other end is a terminal block which will provide the power-path-load output from the bq25185 which will range from 3.0V (battery near-dead) to 4.5V (USB\/DC\/Solar is powering the board) at about 1 Amp max. Another terminal port will give 3.3V output, up to 1 A (this will also dip down to 3.0V when the battery is near-empty)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/hi\/products\/usb-a-to-usb-c-cable-1m\" title=\"USB-A to USB-C Cable\"\u003eUSB Type C connector\u003c\/a\u003e with 5.1k CC resistors so it will work with any computer or power supply to get 5V and up to 1A. Data lines available if needed, on the bottom breakout.\u003c\/li\u003e\n\u003cli\u003eSeparate DC or Solar Input - Two pads on the edge can be used to connect a 5 ~ 18V power supply, which can be used instead of USB. If the input is a solar panel, the charging chip will adjust the current draw so that the voltage does not dip below the battery, thus optimizing the solar power input. No large capacitor is needed to stabilize it, and you get near-MPPT capability without the cost and complexity of MPPT.\u003c\/li\u003e\n\u003cli\u003eDefault charge rate of 1A, but you can cut the jumper on the back to set the rate to 500mA\u003c\/li\u003e\n\u003cli\u003ePower Path to Load - If the 4.5V or 3.3V load connector is drawing current while the USB \/ DC\/Solar power is attached, it will default to drawing current from the charger and any leftover current will go to the battery. That keeps your battery from constantly charging\/discharging which will reduce the battery life.\u003c\/li\u003e\n\u003cli\u003eRegulated 4.5V-max Output - no matter what voltage you have on the USB or DC \/ solar inputs, the 4.5V terminal block output port will never go above 4.5V due to an internal voltage regulator. Keep this in mind, though, when dealing with high currents and high DC voltages as the LDO will make the board start to overheat and throttle the current.\u003c\/li\u003e\n\u003cli\u003eRegulated 3.3V-max Output - a separate buck converter will take the load output from the bq25185 and switch it down to 3.3V at 1 Amp max load\u003c\/li\u003e\n\u003cli\u003eThree Status LEDs - Orange Charging LED, red Fault LED, and Green 3.3V output LED.\u003c\/li\u003e\n\u003cli\u003eEnable pad - to disable the 3.3V buck converter.\u003c\/li\u003e\n\u003cli\u003eMounting holes!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis board is pretty much plug-and-play. Change the charging jumper if you like, then connect your battery to the BATT port, and the 4.5V-max and 3.3V-max outputs go to your circuit. Don't forget the two outputs will never go above 4.5V or 3.3V, but it can go as low as 3.0V if the battery is nearly empty. You can monitor the voltage on the battery via the secondary pads on the bottom edge, if necessary.\u003c\/p\u003e\n\u003cp\u003eTo use with solar, pick up a \u003ca href=\"\/hi\/collections\/solar-panels-and-management-boards\" title=\"Solar Panels and Management Boards\"\u003e5~7V solar panel\u003c\/a\u003e (using a higher voltage panel will only lose the extra voltage as heat so there's no benefit to going over 7V), and either cut the connector off to wire it directly, or use a \u003ca href=\"\/hi\/products\/3-8-1-3mm-or-3-5-1-1mm-to-5-5-2-1mm-dc-jack-adapter-cable\" title=\"3.8 \/ 1.3mm or 3.5 \/ 1.1mm to 5.5 \/ 2.1mm DC Jack Adapter Cable\"\u003e2.1mm adapter cable\u003c\/a\u003e plus a \u003ca href=\"\/hi\/products\/female-dc-power-adapter-2-1mm-jack-to-screw-terminal-block\" title=\"Female DC Power adapter - 2.1mm jack to screw terminal block\"\u003e2.1mm terminal block\u003c\/a\u003e to get two wires for the DC Input port.\u003c\/p\u003e\n\u003cp\u003eIf you need a board with a higher charge current or a DC plug already on board, check out the \u003ca href=\"\/hi\/products\/adafruit-universal-usb-dc-solar-lithium-ion-polymer-charger-bq24074\" title=\"Adafruit Universal USB \/ DC \/ Solar Lithium Ion\/Polymer Charger (bq24074)\"\u003ebq24074\u003c\/a\u003e which has up to 1.5A charge rate and an on-board 2.1mm DC jack. It doesn't have a buck converter but you could wire up the \u003ca href=\"\/hi\/products\/adafruit-ap3429a-3-3v-buck-converter-breakout-3-3v-output-1-2a-max\" title=\"TLV62569 3.3V Buck Converter Breakout - 3.3V Output 1.2A Max\"\u003eTPS62569\u003c\/a\u003e separately\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/e3V3WYBnTw4?si=VMUeHP1g_KidUDhP\u0026amp;start=424\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen=\"allowfullscreen\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDimensions: 30.2mm x 19.0mm x 10.0mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWeight: 3.6g\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":50847115313425,"sku":"ADA6092","price":8.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0901\/6285\/6209\/files\/adafruit-bq25185-usb-dc-solar-charger-with-3-3v-buck-board-adafruit-ada6092-72274209931649.jpg?v=1735207158","url":"https:\/\/abcd3032.myshopify.com\/hi\/products\/adafruit-bq25185-usb-dc-solar-charger-with-3-3v-buck-board","provider":"Tayyab Zak","version":"1.0","type":"link"}