Adafruit bq25185 USB / DC / Solar Charger with 3.3V Buck Board
bq25185 multi-source LiPoly/LiIon charger combined with a 3.3V buck regulator output, letting a project run directly from the board without a separate regulator.
bq25185 multi-source LiPoly/LiIon charger combined with a 3.3V buck regulator output, letting a project run directly from the board without a separate regulator.
USB-C power input connector; Adafruit Learn says it works with computer or power supply to get 5V and up to 1A.
Solar panel or DC power input to the bq25185 charger.
Power input from the USB connector, exposed on the board.
Common ground connection.
Battery connector and BAT pad for a single-cell LiPo/LiIon battery output or battery voltage monitoring.
Terminal-block load output labelled 4.5V on the board silk; regulated 4.5V max load output.
Terminal-block common ground connection.
Regulated 3.3V output from the separate buck converter, also available on bottom of board as 3V.
USB positive data line exposed by the board.
USB negative data line exposed by the board.
Enable pad for the 3.3V buck output; bringing EN low disables the 3.3V output.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| USB Type C | power | USB-C power input connector; Adafruit Learn says it works with computer or power supply to get 5V and up to 1A. | 5V USB input, up to 1A per Adafruit Learn | |
| VIN | power | Solar panel or DC power input to the bq25185 charger. | 5~18V input per Adafruit Learn | |
| VU | power | Power input from the USB connector, exposed on the board. | USB input rail per Adafruit Learn | |
| G | ground | Common ground connection. | 0V / common ground | |
| BAT | power | Battery connector and BAT pad for a single-cell LiPo/LiIon battery output or battery voltage monitoring. | 3.7V nominal / 4.2V max battery chemistry per Adafruit Learn | |
| 4.5V | power | Terminal-block load output labelled 4.5V on the board silk; regulated 4.5V max load output. | regulated 4.5V max load output per Adafruit Learn | |
| - | ground | Terminal-block common ground connection. | 0V / common ground | |
| 3V | power | Regulated 3.3V output from the separate buck converter, also available on bottom of board as 3V. | 3.3V output, 1A max load per Adafruit Learn | |
| D+ | data | USB positive data line exposed by the board. | USB data line | |
| D- | data | USB negative data line exposed by the board. | USB data line | |
| EN | control | Enable pad for the 3.3V buck output; bringing EN low disables the 3.3V output. | logic/control enable for 3.3V buck output per Adafruit Learn |
Wide input · Module
Verify supply voltage and logic levels before powering up.
Module pins: USB Type C, VIN, VU, BAT, 4.5V, 3V, G, -. Schematik maps them to your board in the app.
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