LM3621M/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Low dropout voltage - High output current capability - Adjustable output voltage - Thermal shutdown protection - Small package size

Package: SOT-23-5

Essence: The LM3621M/NOPB is a voltage regulator IC that provides a regulated output voltage from an unregulated input voltage. It is commonly used in various electronic devices to ensure stable and reliable power supply.

Packaging/Quantity: The LM3621M/NOPB is typically sold in reels containing 3000 units per reel.

Specifications

• Input Voltage Range: 2.5V to 6V
• Output Voltage Range: 1.2V to 5.5V
• Maximum Output Current: 1A
• Dropout Voltage: 200mV at 500mA
• Quiescent Current: 120µA
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM3621M/NOPB has a total of five pins arranged as follows:

____ IN | | EN | | GND| | FB | | OUT|____|

• IN: Input voltage pin
• EN: Enable pin (active high)
• GND: Ground pin
• FB: Feedback pin for adjusting the output voltage
• OUT: Output voltage pin

Functional Features

• Low Dropout Voltage: The LM3621M/NOPB exhibits a low dropout voltage, allowing it to regulate the output voltage even when the input voltage is close to the desired output voltage.
• High Output Current Capability: With a maximum output current of 1A, this voltage regulator can handle high current demands.
• Adjustable Output Voltage: The feedback pin (FB) allows the user to adjust the output voltage within a specified range.
• Thermal Shutdown Protection: The IC includes built-in thermal shutdown protection, which prevents damage due to excessive temperature.
• Small Package Size: The SOT-23-5 package offers a compact form factor, making it suitable for space-constrained applications.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation - High output current capability meets demanding power requirements - Adjustable output voltage provides flexibility - Thermal shutdown protection enhances reliability - Small package size enables use in compact designs

Disadvantages: - Limited input voltage range (2.5V to 6V) - Dropout voltage may affect efficiency in certain applications

Working Principles

The LM3621M/NOPB operates as a linear voltage regulator. It regulates the output voltage by comparing the feedback voltage (FB) with an internal reference voltage. The error amplifier adjusts the pass transistor to maintain the desired output voltage. When the enable pin (EN) is high, the regulator is active, and when it is low, the regulator enters a low-power shutdown mode.

Detailed Application Field Plans

The LM3621M/NOPB finds applications in various electronic devices that require a stable and regulated power supply. Some common application fields include:

1. Battery-Powered Devices: Portable electronics such as smartphones, tablets, and wearable devices benefit from the LM3621M/NOPB's low dropout voltage and high output current capability.
2. Wireless Communication Systems: The voltage regulator ensures reliable power supply to wireless communication modules, such as Wi-Fi and Bluetooth modules.
3. Industrial Control Systems: The LM3621M/NOPB can be used in industrial control systems to provide regulated power to sensors, actuators, and microcontrollers.
4. Automotive Electronics: The IC is suitable for automotive applications where stable power supply is crucial for various electronic components.

Detailed and Complete Alternative Models

1. LM317: A popular linear voltage regulator with adjustable output voltage and high current capability.
2. LM1117: Another widely used voltage regulator IC with low dropout voltage and fixed output voltage options.
3. LT1086: A high-performance linear regulator offering adjustable output voltage and low dropout voltage.
4. LM7805: A classic linear voltage regulator providing a fixed 5V output voltage.

These alternative models offer similar functionality to the LM3621M/NOPB and can be considered based on specific application requirements.

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