How to Use V_REG_TPS61040: Examples, Pinouts, and Specs

The V_REG_TPS61040 is a high-frequency, boost-converter voltage regulator IC designed by Texas Instruments. This component is particularly useful in applications requiring a regulated output voltage from a lower input voltage source. It is capable of stepping up voltages, making it ideal for powering devices that require a higher voltage than what is available from the input source. Common applications include powering OLED displays, CCD sensors, white LED drivers, and portable battery-powered devices.

• Input Voltage Range: 1.8 V to 6.0 V
• Output Voltage Range: Adjustable from 1.8 V to 28 V
• Switch Current Limit: Typically 400 mA
• Quiescent Current: Typically 150 µA
• Switching Frequency: Up to 1.2 MHz
• Efficiency: Up to 90%
• Package: SOT-23-5

1. Input Supply: Connect a filtered and decoupled input voltage source to the VIN pin.
2. Ground Connection: Connect the GND pin to the system ground.
3. Output Voltage Setting: Set the desired output voltage by choosing appropriate resistor values for the voltage divider connected to the FB pin.
4. Inductor Selection: Choose an inductor that can handle the peak switch current and has a low DC resistance.
5. Diode Selection: Select a Schottky diode with a low forward voltage drop and a reverse voltage rating higher than the maximum output voltage.
6. Output Capacitor: Connect an output capacitor to stabilize the output voltage and reduce voltage ripple.
7. Enable Pin: Control the operation of the IC using the EN pin. Apply a logic high to enable the IC.

• Ensure that the input voltage does not exceed the maximum rating of 6.0 V.
• The output voltage should be set carefully to avoid exceeding the maximum rating of 28 V.
• Use ceramic capacitors for input and output decoupling to minimize noise and voltage ripple.
• Place the IC close to the power source and load to minimize losses and improve efficiency.
• Provide adequate thermal management, as the IC may generate heat during operation.

• Output Voltage Too Low or High: Check the feedback resistor values and ensure they are within tolerance.
• IC Overheating: Ensure the inductor and diode are correctly rated and that there is sufficient thermal management.
• Output Voltage Unstable: Verify the output capacitor's value and ESR rating are suitable for the application.

• Incorrect Output Voltage: Recalculate and adjust the feedback resistor values.
• Thermal Issues: Improve heat dissipation with a better PCB layout or additional heat sinking.
• Voltage Instability: Increase the output capacitor value or use a capacitor with a lower ESR.

Q: Can the V_REG_TPS61040 be used to step down voltage? A: No, it is a boost converter and is designed to step up voltage only.

Q: What is the maximum output current of the V_REG_TPS61040? A: The maximum output current depends on the input voltage, inductor size, and thermal conditions but is typically limited by the 400 mA switch current limit.

Q: How do I enable the V_REG_TPS61040? A: Apply a logic high signal to the EN pin to enable the IC.

// Example code to enable the V_REG_TPS61040 using an Arduino UNO

const int enablePin = 2; // Connect to the EN pin of the V_REG_TPS61040

void setup() {
  pinMode(enablePin, OUTPUT); // Set the enable pin as an output
}

void loop() {
  digitalWrite(enablePin, HIGH); // Enable the V_REG_TPS61040
  delay(1000); // Wait for 1 second
  digitalWrite(enablePin, LOW); // Disable the V_REG_TPS61040
  delay(1000); // Wait for 1 second
}

This example demonstrates how to toggle the enable pin of the V_REG_TPS61040 to turn the voltage regulator on and off using an Arduino UNO. The enable pin is connected to digital pin 2 on the Arduino. The digitalWrite function is used to set the enable pin high or low, thus controlling the state of the V_REG_TPS61040.