Multi-source LiPoly/LiIon/LiFePO4 charger based on the bq25185, accepting USB, DC, or solar input. Supports 250mA, 500mA, or 1A charge rates; good value upgrade from MCP73831-based boards.
USB Type-C input connector with 5.1k CC resistors
separate DC or solar input pads, alternative to USB input
single-cell battery output/connection, default 500mA charge rate
load output powered from charger when input is present, with battery support for spikes
thermistor pad, cut TH jumper and connect 10K thermistor for battery temperature charge-rate adjustment
voltage setting pad, used with back jumper for LiFePO4 3.2V nominal / 3.65V max mode
current setting pad, used with back jumpers to choose 1A or 250mA instead of default 500mA
Status 1 pad connected to the red FAULT LED
Status 2 pad connected to the orange CHRG LED
chip enable pad, pull high to disable the charger IC
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| USB-C | top edge USB-C connector | Power | USB Type-C input connector with 5.1k CC resistors | 5V input, up to 1A |
| DCIN | right side pads | Power | separate DC or solar input pads, alternative to USB input | 5V to 18V |
| BATT | bottom JST-PH connector and right side monitor pads | Unknown | single-cell battery output/connection, default 500mA charge rate | 3.7V nominal / 4.2V max default LiPo/LiIon |
| LOAD | bottom JST-PH connector and right side monitor pads | Power | load output powered from charger when input is present, with battery support for spikes | regulated output, never above 4.5V |
| TH | status/control pads | Analog | thermistor pad, cut TH jumper and connect 10K thermistor for battery temperature charge-rate adjustment | |
| VS | status/control pads | Control | voltage setting pad, used with back jumper for LiFePO4 3.2V nominal / 3.65V max mode | |
| IS | status/control pads | Control | current setting pad, used with back jumpers to choose 1A or 250mA instead of default 500mA | |
| S1 | status/control pads | Unknown | Status 1 pad connected to the red FAULT LED | |
| S2 | status/control pads | Unknown | Status 2 pad connected to the orange CHRG LED | |
| /CE | status/control pads | Control | chip enable pad, pull high to disable the charger IC |
USB Type-C input connector with 5.1k CC resistors
separate DC or solar input pads, alternative to USB input
single-cell battery output/connection, default 500mA charge rate
load output powered from charger when input is present, with battery support for spikes
thermistor pad, cut TH jumper and connect 10K thermistor for battery temperature charge-rate adjustment
voltage setting pad, used with back jumper for LiFePO4 3.2V nominal / 3.65V max mode
current setting pad, used with back jumpers to choose 1A or 250mA instead of default 500mA
Status 1 pad connected to the red FAULT LED
Status 2 pad connected to the orange CHRG LED
chip enable pad, pull high to disable the charger IC
Wide input · Module
Verify supply voltage and logic levels before powering up.
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