LM3503SQX-25

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage Regulator

Characteristics: - Low Dropout Voltage - Adjustable Output Voltage - Current Limit Protection - Thermal Shutdown Protection

Package: 8-WSON (2x2mm)

Essence: The LM3503SQX-25 is a voltage regulator IC that provides a stable output voltage with low dropout. It is commonly used in various electronic devices to regulate and control the voltage levels.

Packaging/Quantity: The LM3503SQX-25 is available in tape and reel packaging, with a quantity of 3000 units per reel.

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 1.2V to 3.3V
• Dropout Voltage: 200mV at 150mA
• Quiescent Current: 40µA
• Maximum Output Current: 150mA
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM3503SQX-25 has the following pin configuration:

```

---

| | --| VOUT | --| GND | --| EN | --| FB | --| VIN | --| | |___________| ```

Functional Features

1. Low Dropout Voltage: The LM3503SQX-25 exhibits a low dropout voltage, ensuring efficient regulation even when the input voltage is close to the desired output voltage.
2. Adjustable Output Voltage: The output voltage can be easily adjusted within the specified range using external resistors.
3. Current Limit Protection: The IC incorporates current limit protection, preventing excessive current flow and protecting the connected components.
4. Thermal Shutdown Protection: In case of excessive temperature rise, the LM3503SQX-25 automatically shuts down to prevent damage.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation. - Adjustable output voltage provides flexibility in various applications. - Current limit and thermal shutdown protection enhance reliability and safety.

Disadvantages: - Limited maximum output current may not be suitable for high-power applications. - Requires external resistors for adjusting the output voltage.

Working Principles

The LM3503SQX-25 operates as a linear voltage regulator. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a stable output voltage. The dropout voltage is minimized by utilizing a low resistance pass transistor.

Detailed Application Field Plans

The LM3503SQX-25 finds applications in various electronic devices that require regulated voltage levels. Some common application fields include: 1. Mobile Phones 2. Portable Media Players 3. Digital Cameras 4. Wireless Headsets 5. Battery-Powered Devices

Detailed and Complete Alternative Models

1. LM317: Adjustable Voltage Regulator with Higher Output Current Capability.
2. LM1117: Fixed Voltage Regulator with Lower Dropout Voltage.
3. LT1763: Ultra-Low Dropout Voltage Regulator with Higher Maximum Output Current.

These alternative models offer different features and specifications, providing options based on specific requirements.

In conclusion, the LM3503SQX-25 is a voltage regulator IC that offers low dropout voltage, adjustable output voltage, and various protection features. It is widely used in electronic devices requiring stable voltage regulation.