How to Use PowerBoost 500 Charger: Examples, Pinouts, and Specs

The PowerBoost 500 Charger by Adafruit is a compact and efficient power management module designed to boost voltage from a lower input source to a stable 5V output. It is ideal for powering USB devices or charging lithium polymer (LiPo) or lithium-ion batteries. With its high output current capability and integrated protection features, the PowerBoost 500 Charger is a versatile solution for portable electronics, DIY projects, and battery-powered systems.

• Powering USB devices from a single-cell LiPo or lithium-ion battery
• Portable electronics and wearable devices
• DIY power banks and battery backup systems
• Robotics and embedded systems
• Arduino and Raspberry Pi projects requiring a stable 5V supply

The following table outlines the key technical details of the PowerBoost 500 Charger:

The PowerBoost 500 Charger has the following pinout:

1. Power Input: Connect a single-cell LiPo or lithium-ion battery to the BAT pin. Alternatively, you can power the module via the micro-USB connector.
2. Output Connection: Connect your load (e.g., Arduino, Raspberry Pi, or USB device) to the 5V output pin and GND.
3. Enable/Disable: Use the EN pin to control the output. Pull it low to disable the output or leave it floating to enable.
4. Low-Battery Monitoring: Use the LBO pin to monitor the battery status. When the battery voltage drops below the threshold, the LBO pin will go low, signaling a low-battery condition.

• Battery Selection: Use only single-cell LiPo or lithium-ion batteries with a nominal voltage of 3.7V.
• Heat Dissipation: The module may heat up under high loads. Ensure proper ventilation or heat sinking if operating near the maximum current.
• Output Voltage: The output is regulated at 5.2V to compensate for voltage drops in USB cables. This is safe for most 5V devices.
• Charging: When connected to a USB power source, the module will charge the battery at a rate of 500mA. Ensure your battery can handle this charging current.

The PowerBoost 500 Charger can be used to power an Arduino UNO. Below is an example circuit and code to monitor the low-battery signal.

• Connect the 5V output of the PowerBoost to the 5V pin on the Arduino UNO.
• Connect GND of the PowerBoost to the GND pin on the Arduino UNO.
• Connect the LBO pin of the PowerBoost to a digital input pin (e.g., pin 2) on the Arduino UNO.

const int lboPin = 2; // Pin connected to the LBO pin of the PowerBoost
const int ledPin = 13; // Built-in LED to indicate low battery

void setup() {
  pinMode(lboPin, INPUT); // Set LBO pin as input
  pinMode(ledPin, OUTPUT); // Set LED pin as output
  digitalWrite(ledPin, LOW); // Turn off LED initially
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int lboState = digitalRead(lboPin); // Read the state of the LBO pin

  if (lboState == LOW) {
    // If LBO pin is LOW, battery is critically low
    digitalWrite(ledPin, HIGH); // Turn on LED
    Serial.println("Warning: Low battery detected!");
  } else {
    // If LBO pin is HIGH, battery is okay
    digitalWrite(ledPin, LOW); // Turn off LED
    Serial.println("Battery level is sufficient.");
  }

  delay(1000); // Wait for 1 second before checking again
}

1. Module Overheating

   • Cause: High current draw or insufficient ventilation.
   • Solution: Reduce the load or improve airflow around the module.

2. Output Voltage Dropping Below 5V

   • Cause: Battery voltage is too low or load exceeds the module's capacity.
   • Solution: Recharge the battery or reduce the load.

3. Battery Not Charging

   • Cause: Faulty battery connection or insufficient USB power supply.
   • Solution: Check the battery connections and ensure the USB power source can supply at least 500mA.

4. LBO Pin Always Low

   • Cause: Battery voltage is below the low-battery threshold.
   • Solution: Recharge the battery or adjust the low-battery threshold using the LBI pin.

Q: Can I use the PowerBoost 500 Charger without a battery?
A: Yes, you can power the module directly via the USB input. However, the low-battery features will not function.

Q: Is the output safe for USB devices?
A: Yes, the output is regulated at 5.2V, which is within the safe range for USB devices.

Q: Can I use this module with a 2-cell LiPo battery?
A: No, the PowerBoost 500 Charger is designed for single-cell LiPo or lithium-ion batteries only.

Q: What happens if the battery voltage drops too low?
A: The module will automatically shut down to protect the battery from over-discharge.