LM3487QMM/NOPB

Product Overview

Category: Integrated Circuits (ICs)

Use: The LM3487QMM/NOPB is a high-efficiency, synchronous buck regulator designed for use in various applications such as portable devices, battery-powered systems, and industrial equipment.

Characteristics: - High efficiency - Synchronous rectification - Wide input voltage range - Adjustable output voltage - Low quiescent current - Overcurrent protection - Thermal shutdown protection

Package: The LM3487QMM/NOPB is available in a small 10-pin VSSOP package, which allows for space-saving designs.

Essence: This IC is essential for converting a higher input voltage to a lower output voltage efficiently, making it suitable for battery-powered devices where power conservation is crucial.

Packaging/Quantity: The LM3487QMM/NOPB is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 2.97V to 18V
• Output Voltage Range: 0.8V to VIN
• Maximum Output Current: 1.5A
• Switching Frequency: Up to 2MHz
• Quiescent Current: 50µA
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM3487QMM/NOPB has the following pin configuration:

1. SW: Switching Node
2. GND: Ground
3. FB: Feedback Voltage Input
4. EN: Enable Pin
5. SS/TR: Soft-Start/Tracking
6. PGND: Power Ground
7. LX: Inductor Connection
8. VCC: Supply Voltage Input
9. COMP: Compensation Node
10. VREF: Reference Voltage Output

Functional Features

• High Efficiency: The LM3487QMM/NOPB utilizes synchronous rectification and other advanced techniques to achieve high efficiency, minimizing power losses.
• Adjustable Output Voltage: The output voltage can be easily adjusted using external resistors, allowing for flexibility in various applications.
• Overcurrent Protection: The IC incorporates overcurrent protection, safeguarding the circuit from excessive current flow.
• Thermal Shutdown Protection: In case of excessive temperature, the LM3487QMM/NOPB automatically shuts down to prevent damage.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power consumption - Wide input voltage range allows for versatile applications - Compact package enables space-saving designs - Overcurrent and thermal shutdown protection enhance reliability

Disadvantages: - Limited maximum output current (1.5A) - Requires external components for operation

Working Principles

The LM3487QMM/NOPB operates as a synchronous buck regulator, converting a higher input voltage to a lower output voltage efficiently. It uses pulse-width modulation (PWM) to control the duty cycle of the internal switches, regulating the output voltage. Synchronous rectification minimizes power losses by utilizing a low-side MOSFET to replace the diode typically found in non-synchronous designs.

Detailed Application Field Plans

The LM3487QMM/NOPB is suitable for a wide range of applications, including: - Portable devices (e.g., smartphones, tablets) - Battery-powered systems (e.g., laptops, cameras) - Industrial equipment (e.g., motor drives, LED lighting)

Alternative Models

Other alternative models that offer similar functionality to the LM3487QMM/NOPB include: - LM3488: Higher maximum output current (3A) - LM2576: Non-synchronous buck regulator with adjustable output voltage - TPS5430: Synchronous buck converter with integrated MOSFETs

These alternative models can be considered based on specific requirements and design constraints.

In conclusion, the LM3487QMM/NOPB is a high-efficiency synchronous buck regulator that offers adjustable output voltage, overcurrent protection, and thermal shutdown protection. It finds applications in portable devices, battery-powered systems, and industrial equipment. While it has some limitations, it provides an efficient solution for power conversion needs.