onsemi MC33269DTRKG 3V LDO Voltage Regulator: Datasheet, Pinout, and Application Circuit Guide
The onsemi MC33269DTRKG is a robust and reliable low-dropout (LDO) linear voltage regulator designed to deliver a fixed 3.3V output at a maximum current of 800 mA. Housed in a space-efficient D2PAK-5 (TO-263-5) surface-mount package, this regulator is engineered for a wide range of applications, particularly those requiring stable power with minimal noise.
Key Features and Datasheet Highlights
The MC33269DTRKG stands out due to its impressive set of characteristics, making it a preferred choice for power management:
Low Dropout Voltage: With a typical dropout of just 1.1V at 800 mA, it can regulate the 3.3V output even when the input voltage is as low as 4.4V, enhancing efficiency and extending battery life in portable devices.
High Output Accuracy: The output voltage is guaranteed to within ±2% over the entire line, load, and temperature range, ensuring precision for sensitive circuitry.
Low Quiescent Current: It features a low ground pin current, which minimizes power loss when the system is in standby or light-load conditions.
Built-in Protections: The device is fortified with internal current limiting and thermal shutdown features, safeguarding both the regulator and the load from damage due to overloads or excessive junction temperature.
Wide Input Voltage Range: It can accept input voltages from 4.4V to 20V, making it versatile for both 5V and 12V bus systems.
Pinout Configuration
Understanding the pinout is crucial for proper PCB layout. The 5-pin configuration is as follows:
1. Input (VIN): Pin 1 is the input voltage pin. A suitable input bypass capacitor must be connected close to this pin.
2. Ground (GND): Pins 2 and 4 are the ground references for the IC. They must be connected to the system ground plane.
3. Enable (EN): Pin 3 is the enable control pin. Pulling this pin high (>1.5V) turns the regulator on; pulling it low (<0.8V) places it in a low-power shutdown mode.
4. Output (VOUT): Pin 5 is the regulated 3.3V output. A minimum output capacitor is required for stability.
Application Circuit Guide
A typical application circuit for the MC33269DTRKG is straightforward to implement. The basic schematic requires only a few external components:
1. Input Capacitor (CIN): A 10 µF ceramic capacitor should be placed as close as possible to the VIN and GND pins to suppress input line noise and ensure stability. A larger value may be needed if the input source is distant.
2. Output Capacitor (COUT): A 10 µF ceramic capacitor on the output is sufficient to guarantee stability. It improves the transient response and helps maintain a steady output voltage.
3. Enable Control: The EN pin can be driven directly by a microcontroller's GPIO pin for power sequencing. If this feature is not needed, the pin can be tied directly to VIN to keep the regulator permanently enabled.
This simple circuit provides a clean, stable, and protected 3.3V rail from a higher unregulated input source, making it ideal for powering microcontrollers, sensors, digital logic, and other low-voltage components.
ICGOODFIND The onsemi MC33269DTRKG is a highly efficient and protected LDO voltage regulator, offering exceptional accuracy and low dropout performance. Its simple design, minimal external component count, and robust feature set make it an excellent and reliable solution for stabilizing voltage rails in a vast array of electronic devices, from consumer electronics to industrial systems.
Keywords: LDO Regulator, 3.3V Output, Low Dropout Voltage, Thermal Protection, Enable Pin.
