LP2951CS-L-3-3

Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Low dropout voltage - Low quiescent current - Adjustable output voltage - Thermal shutdown protection - Short-circuit current limiting

Package: TO-263-5 (D2PAK)

Essence: The LP2951CS-L-3-3 is a low dropout voltage regulator IC designed to provide a regulated output voltage with low quiescent current. It is commonly used in various electronic devices to ensure stable and reliable power supply.

Packaging/Quantity: The LP2951CS-L-3-3 is typically available in reel packaging with 2500 units per reel.

Specifications

• Input Voltage Range: 4.75V to 30V
• Output Voltage Range: 3.3V
• Dropout Voltage: 0.6V (typical)
• Quiescent Current: 75µA (typical)
• Output Current: 100mA
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LP2951CS-L-3-3 has a total of five pins:

1. GND (Ground): Connected to the ground reference of the circuit.
2. ADJ (Adjust): Used to adjust the output voltage.
3. VOUT (Output Voltage): Provides the regulated output voltage.
4. VIN (Input Voltage): Receives the input voltage to be regulated.
5. SHUTDOWN: Used to enable or disable the device.

Functional Features

• Low Dropout Voltage: The LP2951CS-L-3-3 exhibits a low dropout voltage, allowing it to regulate the output voltage even when the input voltage is close to the desired output voltage.
• Low Quiescent Current: With a low quiescent current, the IC minimizes power consumption when in standby or idle mode.
• Adjustable Output Voltage: The ADJ pin allows for easy adjustment of the output voltage to meet specific requirements.
• Thermal Shutdown Protection: The IC incorporates thermal shutdown protection, which prevents damage due to excessive temperature.
• Short-Circuit Current Limiting: The LP2951CS-L-3-3 features short-circuit current limiting to protect against excessive current flow during a short circuit.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation even with small input-output voltage differentials. - Adjustable output voltage provides flexibility for various applications. - Thermal shutdown protection safeguards the IC from overheating. - Short-circuit current limiting protects the device and connected components.

Disadvantages: - Limited output current capacity (100mA) may not be suitable for high-power applications. - Requires external components for proper operation.

Working Principles

The LP2951CS-L-3-3 operates as a linear voltage regulator. It uses a pass transistor to regulate the output voltage based on the difference between the input and desired output voltage. The internal circuitry monitors the output voltage and adjusts the pass transistor accordingly to maintain a stable output voltage.

Detailed Application Field Plans

The LP2951CS-L-3-3 finds applications in various electronic devices that require a regulated power supply. Some common application fields include:

1. Battery-powered devices: The low dropout voltage and low quiescent current make it suitable for battery-powered devices where power efficiency is crucial.
2. Embedded systems: The adjustable output voltage and thermal shutdown protection make it ideal for powering microcontrollers, sensors, and other components in embedded systems.
3. Communication equipment: The IC can be used to provide stable power supply to communication modules, routers, and network switches.
4. Automotive electronics: The LP2951CS-L-3-3 can be employed in automotive applications such as infotainment systems, dashboard displays, and control modules.

Detailed and Complete Alternative Models

1. LM1117-3.3: A popular alternative with similar specifications and package.
2. LT1763-3.3: Offers higher output current capability and lower dropout voltage.
3. MCP1703-3302E/DB: Provides a low quiescent current and adjustable output voltage.

These alternative models offer similar functionality and can be considered based on specific requirements and availability.

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