Adafruit bq25185 USB / DC / Solar Lithium Ion/Polymer Charger

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-Ctop edge USB-C connector
USB Type-C input connector with 5.1k CC resistors
Type · power input connectorVoltage · 5V input, up to 1A
DCINright side pads
separate DC or solar input pads, alternative to USB input
Type · power inputVoltage · 5V to 18V
BATTbottom JST-PH connector and right side monitor pads
single-cell battery output/connection, default 500mA charge rate
Type · battery connectorVoltage · 3.7V nominal / 4.2V max default LiPo/LiIon
LOADbottom JST-PH connector and right side monitor pads
load output powered from charger when input is present, with battery support for spikes
Type · regulated power outputVoltage · regulated output, never above 4.5V

Start wiring

Wide input · Module

Verify supply voltage and logic levels before powering up.

Solar

27 other options

Solar panels from 1.5V 250mA flexible film to 18V 10W polysilicon, MPPT solar power managers (DFRobot 5V and 9V/12V/18V, Waveshare 6V–24V), bq25185 charger boards and LTC3588 energy-harvesting breakouts.

View all 27

3.8 / 1.3mm or 3.5 / 1.1mm to 5.5 / 2.1mm DC Jack Adapter Cable visual preview

Related groups

4 groups

Batteries

9V alkaline cells, CR2032 coin cells, 3.7V LiPo packs (1000–1200mAh), 7.4V 2S LiPo, 18650 Li-ion holders (1–6 cells), AA/AAA holders in every configuration, and snap leads with barrel adapters.

Power · Batteries · 105 parts

Charging

Single-cell LiPo chargers (TP4056, MicroUSB/Type-C modules), charger/booster combos (PowerBoost 500/1000, Lipo Rider Plus 5V/2.4A), I2C fuel gauges (MAX17048, LC709203F) and Qi wireless charging coils.

Power · Chargers & fuel gauges · 46 parts

Power supplies

Wall adapters (5V–24V), adjustable and fixed buck/boost/buck-boost converters (MT3608, LM2596-class), USB-C PD triggers (HUSB238), breadboard supplies, DIN-rail units and passive barrel-jack adapters.

Power · Supplies & regulators · 146 parts

3D printing

DFRobot 1.75 mm PLA in 1 kg spools makes up the bulk of the group, in over 15 colors. Specialty options include PVA in both diameters, NinjaFlex flexible filament, Proto-Pasta conductive PLA, and wood-fill. OverLord printer spares and OverLord printers round out the hardware side.

Tools & prototyping · 3D printing · 53 parts

Pin	Position	Type	Function	Voltage
USB-C	top edge USB-C connector	power input connector	USB Type-C input connector with 5.1k CC resistors	5V input, up to 1A
DCIN	right side pads	power input	separate DC or solar input pads, alternative to USB input	5V to 18V
BATT	bottom JST-PH connector and right side monitor pads	battery connector	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	regulated power output	load output powered from charger when input is present, with battery support for spikes	regulated output, never above 4.5V
TH	status/control pads	analogue control	thermistor pad, cut TH jumper and connect 10K thermistor for battery temperature charge-rate adjustment
VS	status/control pads	configuration pad	voltage setting pad, used with back jumper for LiFePO4 3.2V nominal / 3.65V max mode
IS	status/control pads	configuration pad	current setting pad, used with back jumpers to choose 1A or 250mA instead of default 500mA
S1	status/control pads	status output	Status 1 pad connected to the red FAULT LED
S2	status/control pads	status output	Status 2 pad connected to the orange CHRG LED
/CE	status/control pads	digital control input	chip enable pad, pull high to disable the charger IC