Power System
Boboduino features a simple power management system, allowing you to provide power through either the Type-C USB connector or the 5V 2.54mm JST connector. The board has a power supply switch that enables you to manually switch between USB and JST power sources. BOBO has integrated the TPS2596 eFuse IC, which helps control the input voltage and current within a safe range. If the input voltage falls below or exceeds the rated voltage range, the BOBO board will not start up and the power LED will be off. Additionally, the TPS5410 lithium battery management IC is placed at the backend of the eFuse IC, enabling lithium battery charging and discharging management. When there is no external USB or 5V power supply, the TPS5410 chip will automatically activate the internal 5V boost circuit to power the BOBO board using the lithium battery. For the 3.3V part, the AP2112 is a 3.3V linear regulator (LDO) that converts 5V to 3.3V. To facilitate quick voltage switching using the BOBO board, you can use the jumper located at the center of the board to select the output voltage of Boboduino.
Lithium Battery Charging Mode
🔋 This charging system can only charge a single lithium battery (one lithium battery), and cannot be used for series or parallel lithium batteries.
The BOBO board adopts the TP5410 lithium battery management IC, making it suitable for portable electronic component projects. In charging mode, you can charge your lithium battery through Type-C USB or 5V power. During lithium battery charging, TP5410 automatically controls the voltage, current, and other conditions until the battery is fully charged. To be noted, this charging system can only charge single lithium batteries. To meet the charging speed requirements of lithium batteries with different capacities, you can adjust it through the jumper located on the back of the board. There are three charging modes: 1A, 500mA, and 80mA. Please refer to the [Jumper adjustment guide] for more information.
Lithium-ion Battery Power Supply Mode
When there is no external power supply (such as not connecting a USB cable), the TP5410 lithium-ion battery management IC boosts the battery voltage to 5V, the board will entering the battery power supply mode. Since the 3.3V voltage on the board is output through a linear regulator (LOD), you can switch the green jumper to switch the board to 3.3V mode.
Choosing a Suitable Lithium Battery
🔋 Please select a single lithium battery with a protection board.
To ensure the safety of the charging and discharging process, BOBODUINO has designed a circuit with battery reverse connection protection(reverse polarity protection), and the TPS5410 IC provides stable lithium battery charging and power boost management. When choosing a battery, it is recommended to select one with a protection board to avoid overcharging, over-discharging, or short-circuit issues.
Over discharge protection
Sometimes, our battery may run out of power. To protect the battery from being overdrained, the Boboduino board is equipped with an over-discharge protection IC.(Which is an small square IC you can find at the back of the board). When the battery voltage drops below 2.8V, the battery protection IC cuts the ground connection between the battery and the circuit board. This prevents the battery from being overdrained. To reactivate the board, you will need to plug in your USB or 5V power source to charge the battery until it reaches around 3.0V. This helps to extend your battery life.