How to Use TPS6211*: Examples, Pinouts, and Specs

The TPS62112 is a high-efficiency step-down DC-DC converter manufactured by Texas Instruments. It is designed for portable and battery-powered applications, offering a compact solution for converting a wide range of input voltages into a stable, adjustable output voltage. With its low quiescent current and integrated features such as power good indication and thermal shutdown, the TPS62112 ensures reliable and efficient operation in various electronic systems.

• Battery-powered devices (e.g., smartphones, tablets, and wearables)
• Industrial and medical equipment
• Point-of-load power supplies
• Portable instrumentation
• Embedded systems requiring efficient voltage regulation

The TPS62112 is available in a 16-pin TSSOP package. Below is the pinout and description:

1. Input Voltage Supply: Connect the input voltage (3.1 V to 17 V) to the VIN pin. Use a decoupling capacitor (e.g., 10 µF) close to the VIN pin to reduce noise.
2. Output Voltage Adjustment: Use a resistor divider network connected to the FB pin to set the desired output voltage. Refer to the formula in the datasheet for calculating resistor values.
3. Inductor Selection: Choose an inductor with appropriate current rating and inductance value (e.g., 10 µH) to ensure stable operation.
4. Enable Pin: Drive the EN pin high to enable the device. Pull it low to disable the output.
5. Power Good Monitoring: Use the PG pin to monitor the output voltage status. A high signal indicates the output is within regulation.
6. Thermal Considerations: Ensure proper PCB layout with adequate thermal dissipation to prevent overheating.

Below is a basic circuit diagram for using the TPS62112:

VIN (3.1V-17V) ----[10µF]---- VIN
                          |
                          |
                         SW ----[Inductor]---- VOUT
                          |                   |
                          |                   |
                         GND                 FB ----[Resistor Divider]---- GND

The TPS62112 can be used to power an Arduino UNO or other microcontrollers. Below is an example code snippet to monitor the Power Good (PG) pin:

// Define the PG pin connected to Arduino
const int pgPin = 2; // Connect PG pin of TPS62112 to 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) {
    Serial.println("TPS62112 Output Voltage is Stable.");
  } else {
    Serial.println("TPS62112 Output Voltage is NOT Stable.");
  }

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

1. Output Voltage Not Stable:

   • Check the resistor divider network connected to the FB pin. Ensure the resistor values are correct for the desired output voltage.
   • Verify the inductor and capacitor values. Incorrect values can cause instability.

2. Device Overheating:

   • Ensure proper PCB layout with sufficient thermal vias and copper area for heat dissipation.
   • Check if the input voltage or load current exceeds the device's specifications.

3. Power Good (PG) Pin Not Responding:

   • Verify the connection between the PG pin and the monitoring circuit.
   • Ensure the output voltage is within the regulation range.

4. No Output Voltage:

   • Confirm that the EN pin is driven high to enable the device.
   • Check the input voltage and ensure it is within the specified range.

Q1: Can the TPS62112 operate with a fixed output voltage?
A1: No, the TPS62112 requires an external resistor divider network to set the output voltage. It does not have fixed output voltage options.

Q2: What is the maximum load current supported?
A2: The TPS62112 can supply up to 1.5 A of continuous output current.

Q3: How do I calculate the resistor values for the FB pin?
A3: Use the formula provided in the datasheet:
[ V_{OUT} = V_{REF} \times \left(1 + \frac{R1}{R2}\right) ]
Where ( V_{REF} ) is 0.9 V, and ( R1 ) and ( R2 ) are the feedback resistors.

Q4: Can I use the TPS62112 for 12 V to 5 V conversion?
A4: Yes, the TPS62112 supports input voltages up to 17 V and can step down to 5 V with appropriate external components.

This concludes the documentation for the TPS62112. For further details, refer to the official datasheet provided by Texas Instruments.