Developer boards - Charger board for 3.7V Li batteries, Micro-US

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 Micro USB type B connector or solder pads. The battery is connected via solder pads. With the additional output and the protection circuit, a terminal device can be permanently supplied with power.

Technical data - Chipset: TC4056A - Charging method: linear charge - Charge current: 1 A default, optionally adjustable - Charge accuracy: 1.5% - Input voltage: 4.5 ... 5,5 V - Final charge voltage: 4.2 V - blue LED: charge complete - red LED: charging in progress - Input: Micro USB Type B female 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