How to Use TP5100: Examples, Pinouts, and Specs

The TP5100 is a high-efficiency linear voltage regulator designed to deliver a stable output voltage with a low dropout. It is widely used in battery-powered devices due to its compact size, high efficiency, and robust protection features. The TP5100 integrates thermal protection, overcurrent protection, and under-voltage lockout, making it a reliable choice for various applications.

• Lithium-ion battery charging circuits
• Portable electronic devices
• Power management systems
• Solar-powered devices
• Embedded systems requiring efficient voltage regulation

The TP5100 is designed to operate efficiently in a wide range of applications. Below are its key technical specifications:

The TP5100 is typically available in an 8-pin SOP package. Below is the pinout and description:

1. Power Supply: Connect the input voltage (VIN) to a DC power source within the range of 4.5V to 18V.
2. Battery Connection: Connect the BAT pin to the positive terminal of the battery. Ensure the battery type matches the output voltage configuration (4.2V for single-cell or 8.4V for dual-cell).
3. Output Load: Connect the load to the VOUT pin. Ensure the load does not exceed the maximum output current of 2A.
4. Status LEDs: Optionally, connect LEDs to the STAT1 and STAT2 pins for visual charging status indication.
5. Enable Pin: Pull the EN pin high to enable the regulator. If unused, connect it to VIN through a pull-up resistor.

• Heat Dissipation: The TP5100 may generate heat during operation. Use a heat sink or ensure proper ventilation to avoid thermal shutdown.
• Input Capacitor: Place a low-ESR capacitor (e.g., 10µF) close to the VIN pin to stabilize the input voltage.
• Output Capacitor: Use a low-ESR capacitor (e.g., 22µF) at the VOUT pin to ensure stable output voltage.
• Battery Type: Ensure the connected battery matches the configured output voltage (4.2V or 8.4V).
• Protection Features: The TP5100 includes built-in protection, but avoid exceeding the maximum input voltage or current ratings.

The TP5100 can be used to charge a battery that powers an Arduino UNO. Below is an example of how to monitor the charging status using the Arduino:

// TP5100 Charging Status Monitoring with Arduino UNO
// Connect STAT1 and STAT2 pins of TP5100 to Arduino digital pins 2 and 3

const int stat1Pin = 2; // STAT1 pin connected to digital pin 2
const int stat2Pin = 3; // STAT2 pin connected to digital pin 3

void setup() {
  pinMode(stat1Pin, INPUT); // Set STAT1 as input
  pinMode(stat2Pin, INPUT); // Set STAT2 as input
  Serial.begin(9600);       // Initialize serial communication
}

void loop() {
  int stat1 = digitalRead(stat1Pin); // Read STAT1 pin
  int stat2 = digitalRead(stat2Pin); // Read STAT2 pin

  if (stat1 == LOW && stat2 == HIGH) {
    Serial.println("Battery is charging...");
  } else if (stat1 == HIGH && stat2 == LOW) {
    Serial.println("Battery is fully charged.");
  } else {
    Serial.println("No battery detected or error.");
  }

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

1. No Output Voltage

   • Cause: The EN pin is not pulled high.
   • Solution: Ensure the EN pin is connected to VIN through a pull-up resistor or directly pulled high.

2. Overheating

   • Cause: Excessive load current or insufficient heat dissipation.
   • Solution: Reduce the load current or add a heat sink to the TP5100.

3. Battery Not Charging

   • Cause: Incorrect battery connection or mismatched output voltage configuration.
   • Solution: Verify the battery connection and ensure the battery type matches the output voltage.

4. LED Indicators Not Working

   • Cause: Incorrect connection to STAT1 and STAT2 pins.
   • Solution: Check the LED connections and ensure proper polarity.

Q1: Can the TP5100 charge a 3.7V lithium-ion battery?
A1: Yes, the TP5100 can charge a 3.7V lithium-ion battery by configuring the output voltage to 4.2V.

Q2: What happens if the input voltage exceeds 18V?
A2: The TP5100 may enter over-voltage protection mode or get damaged. Always ensure the input voltage stays within the specified range.

Q3: Can I use the TP5100 without a battery?
A3: Yes, the TP5100 can provide a regulated output voltage to a load even without a battery connected.

Q4: How do I configure the TP5100 for dual-cell batteries?
A4: The TP5100 automatically detects the battery configuration. Ensure the battery voltage matches the 8.4V output for dual-cell operation.