How to Use TPS61022: Examples, Pinouts, and Specs

The TPS61022 is a high-efficiency boost converter manufactured by Anyone. It is designed to step up low input voltages to higher output voltages, making it ideal for battery-powered applications. With its wide input voltage range, adjustable output voltage, and compact package, the TPS61022 is a versatile solution for portable devices and other low-power systems.

• Battery-powered devices (e.g., wearables, IoT devices)
• Portable medical equipment
• Wireless sensors
• Handheld electronics
• Backup power systems

The TPS61022 is available in a 10-pin WSON package. Below is the pin configuration:

1. Input and Output Capacitors:

   • Place a low-ESR ceramic capacitor (e.g., 10 µF) close to the VIN pin to stabilize the input voltage.
   • Use a similar capacitor (e.g., 22 µF) at the VOUT pin to stabilize the output voltage.

2. Inductor Selection:

   • Choose an inductor with a saturation current higher than the peak current of the TPS61022.
   • Typical inductance values range from 0.47 µH to 2.2 µH, depending on the application.

3. Feedback Resistor Divider:

   • Use two resistors to set the output voltage. The formula is: [ V_{OUT} = V_{FB} \times \left(1 + \frac{R_1}{R_2}\right) ] where ( V_{FB} ) is typically 0.8 V.

4. Enable Pin:

   • Drive the EN pin high (logic level 1) to enable the device. Pull it low to disable the device.

5. Soft-Start:

   • Connect a capacitor to the SS pin to control the startup time. A larger capacitor results in a slower startup.

6. Power Good Indicator:

   • Use the PG pin to monitor the output voltage. It is an open-drain output and requires a pull-up resistor.

Below is a basic circuit diagram for the TPS61022:

VIN ----[10 µF]----+----[Inductor]----+---- VOUT
                   |                  |
                  GND                Load

The TPS61022 can be used with an Arduino UNO to control the enable pin. Below is an example code snippet:

// Define the enable pin for the TPS61022
const int enablePin = 7;

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

  // Enable the TPS61022 by setting the pin HIGH
  digitalWrite(enablePin, HIGH);

  // Optional: Add a delay to allow the boost converter to stabilize
  delay(100);
}

void loop() {
  // The TPS61022 remains enabled in this example
  // Add your application code here
}

• Ensure the input voltage does not exceed the maximum rating of 5.5 V.
• Use proper PCB layout techniques to minimize noise and ensure stable operation.
• Place all external components (capacitors, resistors, inductor) as close to the IC as possible.

1. Can the TPS61022 operate with a single AA battery?

   • Yes, the TPS61022 can operate with input voltages as low as 0.5 V, making it suitable for single-cell battery applications.

2. What is the maximum output current?

   • The maximum output current is 5 A, but it depends on the input voltage, output voltage, and external components.

3. How do I calculate the soft-start time?

   • The soft-start time is determined by the capacitor connected to the SS pin. Refer to the datasheet for the exact formula.

4. Can I leave the PG pin unconnected?

   • Yes, the PG pin is optional. If unused, it can be left floating.

By following this documentation, users can effectively integrate the TPS61022 into their designs and troubleshoot common issues.