SPX3940M3-L-3-3/TR

The MaxLinear SPX3940M3-L-3-3/TR is a high-performance low-dropout (LDO) voltage regulator designed for a variety of applications, including consumer electronics, telecommunications, and industrial systems. This device is particularly noted for its efficiency, low noise, and compact size, making it suitable for powering sensitive analog and digital circuits.

### Key Features:

1. Output Voltage: The SPX3940M3-L-3-3/TR provides a fixed output voltage of 3.3V, which is ideal for many digital circuits and microcontrollers.

2. Output Current: It can deliver up to 1A of output current, making it capable of powering a range of devices without the need for additional components.

3. Low Dropout Voltage: The LDO features a low dropout voltage of approximately 300mV at full load (1A), which allows it to maintain regulation even when the input voltage is close to the output voltage. This is particularly beneficial in battery-powered applications where maximizing battery life is crucial.

4. Power Supply Rejection Ratio (PSRR): The SPX3940M3-L-3-3/TR exhibits a high PSRR, typically around 70dB at 1kHz, which helps to minimize the impact of input voltage fluctuations on the output voltage, ensuring stable operation.

5. Low Quiescent Current: The device has a low quiescent current of about 50µA, which is advantageous for applications where power consumption is a concern, such as portable devices.

6. Thermal Protection: It includes built-in thermal shutdown protection, which prevents the device from overheating and ensures reliability in various operating conditions.

7. Short-Circuit Protection: The LDO is designed with short-circuit protection, safeguarding the device and the load in case of a fault condition.

8. Package Type: The SPX3940M3-L-3-3/TR is available in a compact 3-pin SOT-223 package, which is suitable for space-constrained applications.

### Electrical Specifications:

- Input Voltage Range: 2.5V to 16V
- Output Voltage Tolerance: ±2%
- Load Regulation: 0.1% (typical)
- Line Regulation: 0.01%/V (typical)
- Temperature Range: -40°C to +125°C
- Output Noise: 30µVRMS (typical) at 10Hz to 100kHz

### Applications:

The SPX3940M3-L-3-3/TR is suitable for a wide range of applications, including:

- Powering microcontrollers and digital signal processors (DSPs)
- Battery-powered devices
- RF and wireless applications
- Automotive electronics
- Industrial control systems

### Conclusion:

The MaxLinear SPX3940M3-L-3-3/TR is a versatile and efficient LDO voltage regulator that meets the demands of modern electronic applications. With its combination of low dropout voltage, high PSRR, and compact packaging, it is an excellent choice for designers looking to optimize power management in their circuits. Whether in consumer electronics or industrial applications, this LDO provides reliable performance and stability.