How to Use tps63802: Examples, Pinouts, and Specs

The TPS63802, manufactured by W, is a high-efficiency, step-down DC-DC converter designed for low-power applications. It is optimized for portable electronics and battery-powered devices, offering a wide input voltage range, low quiescent current, and adjustable output voltage. This component is ideal for applications requiring efficient power conversion and compact design.

• Wearable devices
• IoT (Internet of Things) devices
• Portable medical equipment
• Battery-powered sensors
• Smartphones and tablets

The TPS63802 is available in a 10-pin WSON package. Below is the pinout and description:

1. Power Supply: Connect the input voltage (VIN) to a power source within the range of 1.3 V to 5.5 V. Use a decoupling capacitor (e.g., 10 µF) close to the VIN pin to reduce noise.
2. Output Voltage Configuration: Use a resistor divider network connected to the FB pin to set the desired output voltage. Refer to the formula in the datasheet to calculate resistor values.
3. Inductor Selection: Choose an inductor with a suitable current rating (e.g., 2.5 A) and low DC resistance for optimal efficiency.
4. Enable Pin: Drive the EN pin high to enable the device. Pull it low to disable the converter.
5. Mode Selection: Use the MODE/SYNC pin to select between automatic mode (high efficiency at light loads) or forced PWM mode (constant frequency operation).
6. Output Capacitor: Connect a low-ESR capacitor (e.g., 22 µF) to the VOUT pin for stable operation.

• Ensure proper grounding by connecting GND and AGND to a common ground plane.
• Place all external components (capacitors, resistors, and inductors) as close as possible to the IC to minimize noise and improve stability.
• Avoid exceeding the maximum input voltage (5.5 V) or output current (2 A) to prevent damage to the device.

The TPS63802 can be used to power an Arduino UNO from a battery source. Below is an example circuit and Arduino code to monitor the Power Good (PG) signal.

• Connect the battery (e.g., 3.7 V Li-ion) to the VIN pin.
• Set the output voltage to 5 V using a resistor divider on the FB pin.
• Connect the VOUT pin to the Arduino UNO's 5 V input.
• Connect the PG pin to a digital input pin on the Arduino (e.g., D2).

// Arduino code to monitor the Power Good (PG) signal from TPS63802

const int pgPin = 2; // PG pin connected to Arduino digital pin 2

void setup() {
  pinMode(pgPin, INPUT); // Set PG pin as input
  Serial.begin(9600);    // Initialize serial communication
}

void loop() {
  int pgStatus = digitalRead(pgPin); // Read the PG pin status

  if (pgStatus == HIGH) {
    // PG is high, output voltage is within regulation
    Serial.println("Power Good: Output voltage is stable.");
  } else {
    // PG is low, output voltage is not within regulation
    Serial.println("Warning: Output voltage is out of regulation!");
  }

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

1. No Output Voltage

   • Cause: EN pin is not driven high.
   • Solution: Ensure the EN pin is connected to a high logic level (e.g., VIN).

2. Output Voltage is Incorrect

   • Cause: Incorrect resistor values in the feedback network.
   • Solution: Verify the resistor divider values and recalculate using the formula in the datasheet.

3. Device Overheating

   • Cause: Excessive load current or poor thermal management.
   • Solution: Ensure the load current does not exceed 2 A. Improve PCB layout for better heat dissipation.

4. PG Pin Always Low

   • Cause: Output voltage is not within the regulation range.
   • Solution: Check the input voltage, load conditions, and feedback network.

Q1: Can the TPS63802 operate with a 1.5 V battery?
A1: Yes, the TPS63802 supports input voltages as low as 1.3 V, making it suitable for single-cell batteries.

Q2: What is the maximum efficiency of the TPS63802?
A2: The TPS63802 can achieve up to 95% efficiency under optimal conditions.

Q3: Can I synchronize the TPS63802 with an external clock?
A3: Yes, the MODE/SYNC pin allows synchronization with an external clock signal.

Q4: Is the TPS63802 suitable for powering microcontrollers?
A4: Yes, the adjustable output voltage and high efficiency make it ideal for powering microcontrollers like Arduino or ESP32.

Q5: What is the recommended inductor value?
A5: A typical inductor value of 1 µH to 2.2 µH is recommended, depending on the application requirements.