Developer boards - Charger board for 3.7V Li batteries, USB-C, 1

This charger board with TC4056 chipset can be used to charge a single lithium-ion or lithium-polymer battery. The input can be either a USB Type C connector or solder pads. The battery is connected via solder pads. Due to the additional output and the protection circuit, a terminal device can be permanently supplied with power.

Technical Data - chipset: TC4056A - charging method: linear charge - charging current: 1 A default, optionally adjustable - charge accuracy: 1,5% - Input voltage: 4,5 ... 5,5 V bulletpoint# end of charge voltage: 4.2 V bulletpoint# blue LED: charge complete - red LED: charging in progress - input: USB Type-C socket or solder pads - output: solder pads - Operating temperature: -10 ... +85 °C - Dimensions (LxWxH): 29 x 18 x 4 mm

Setting the charging current By default the board charges with a charging current of 1000 mA. By changing the resistor R3, the charging current can be set lower.

30 kOhm = 50 mA 20 kOhm = 70 mA 10 kOhm = 130 mA 5 kOhm = 250 mA 4 kOhm = 300 mA 3 kOhm = 400 mA 2 kOhm = 580 mA 1,5 kOhm = 780 mA 1,33 kOhm = 900 mA 1,2 kOhm = 1000 mA

Note This board only works with a standard Raspberry Pi USB-C power supply or with a power supply with a passive cable or without Power Delivery!