How to Use SparkFun LiPo Charger Booster-5V1A: Examples, Pinouts, and Specs

The SparkFun LiPo Charger Booster-5V1A is a versatile and compact electronic component designed for charging single-cell Lithium Polymer (LiPo) batteries and providing a stable 5V output. This makes it an ideal choice for portable electronics, DIY projects, and any application where a 5V power supply is needed alongside battery charging capabilities.

• Portable devices and wearables
• DIY electronics projects
• Microcontroller boards power supply (e.g., Arduino)
• Robotics and remote-controlled devices

• Input Voltage: 3.7V - 5V (from LiPo battery)
• Output Voltage: 5V fixed
• Maximum Charging Current: 1A
• Maximum Boost Current: 1A
• Charging Cutoff Voltage: 4.2V ± 1%
• Efficiency: Up to 95%
• Operating Temperature: -25°C to +85°C

1. Connecting the Battery:

   • Connect the positive terminal of the LiPo battery to the BAT pin.
   • Connect the negative terminal of the LiPo battery to the GND pin.

2. Charging the Battery:

   • Plug a micro USB cable into the USB port and connect it to a USB power source.

3. Enabling the Voltage Booster:

   • Apply a high signal (3.3V or 5V) to the EN pin to enable the 5V output.
   • Alternatively, you can tie the EN pin to the 5V output for automatic enablement when the USB is plugged in.

4. Accessing the 5V Output:

   • Use the 5V pin to power your 5V electronics.

• Ensure the LiPo battery's voltage does not exceed the maximum input voltage.
• Do not reverse the polarity of the battery connections.
• Avoid charging and discharging the LiPo battery simultaneously.
• Use a proper heat sink if operating near the maximum current rating for extended periods.
• Keep the component away from flammable materials during charging.

• Battery not charging: Check the micro USB cable and power source. Ensure the battery is properly connected to the BAT and GND pins.
• No output voltage: Verify that the EN pin is receiving a high signal and that the battery has sufficient charge.
• Overheating: Reduce the load if the component is too hot or ensure adequate ventilation.

• Battery Polarity: Double-check the battery polarity before connecting to prevent damage.
• Charging Source: Use a quality USB power source capable of supplying at least 1A for optimal charging.
• Enable Pin: If the EN pin is not used, ensure it is tied to a known state to prevent erratic behavior.

Q: Can I charge multiple batteries with this component? A: No, it is designed for charging a single LiPo battery.

Q: Is it possible to adjust the output voltage? A: The output voltage is fixed at 5V.

Q: Can this component be used while the battery is charging? A: Yes, but it is recommended to avoid simultaneous charging and discharging for battery health.

// Example code to enable the SparkFun LiPo Charger Booster-5V1A with an Arduino UNO

const int enablePin = 7; // Connect the EN pin of the charger to digital pin 7

void setup() {
  pinMode(enablePin, OUTPUT); // Set the enable pin as an output
  digitalWrite(enablePin, HIGH); // Enable the 5V booster
}

void loop() {
  // Your code here to interact with devices powered by the 5V output
}

Note: This example assumes that the EN pin of the SparkFun LiPo Charger Booster is connected to digital pin 7 of the Arduino UNO. The code sets the pin high, enabling the 5V output.