LM3489QMM/NOPB

Product Overview

• Category: Integrated Circuits (ICs)
• Use: Voltage Regulators - Switching Regulators
• Characteristics:
  • High efficiency
  • Wide input voltage range
  • Adjustable output voltage
  • Low standby current
• Package: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
• Essence: This product is a high-efficiency switching regulator designed to provide a regulated output voltage from an unregulated input voltage source.
• Packaging/Quantity: Tape & Reel (TR) packaging, with 2500 units per reel.

Specifications

• Input Voltage Range: 4.5V to 36V
• Output Voltage Range: 1.23V to 34V
• Switching Frequency: Up to 1MHz
• Output Current: Up to 1A
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM3489QMM/NOPB has the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. FB: Feedback pin for adjusting the output voltage
4. EN: Enable pin for turning the regulator on/off
5. SS/TR: Soft-start/Tracking pin for controlling the startup behavior
6. COMP: Compensation pin for stabilizing the control loop
7. SW: Switch node pin for connecting the inductor and diode
8. PGND: Power ground pin
9. BST: Bootstrap pin for driving the high-side MOSFET
10. VCC: Supply voltage pin for internal circuitry

Functional Features

• High efficiency conversion of input voltage to regulated output voltage
• Adjustable output voltage through feedback pin
• Integrated soft-start and tracking functionality for controlled startup
• Overcurrent protection and thermal shutdown features for enhanced safety
• Wide input voltage range allows for versatile applications

Advantages and Disadvantages

Advantages: - High efficiency results in reduced power dissipation and longer battery life - Wide input voltage range enables usage in various power supply designs - Adjustable output voltage provides flexibility for different application requirements - Integrated protection features enhance system reliability

Disadvantages: - Limited output current capability compared to higher-rated regulators - Requires external components for proper operation, increasing overall system complexity

Working Principles

The LM3489QMM/NOPB is a switching regulator that utilizes a pulse-width modulation (PWM) control scheme to regulate the output voltage. It operates by rapidly switching an internal MOSFET on and off to control the energy transfer from the input to the output. This switching action allows for efficient voltage conversion while maintaining a stable output voltage.

The feedback pin (FB) is used to adjust the output voltage by comparing it to an internal reference. The error amplifier then adjusts the duty cycle of the PWM signal to maintain the desired output voltage. Additional features like soft-start and overcurrent protection ensure safe and reliable operation.

Detailed Application Field Plans

The LM3489QMM/NOPB can be used in various applications, including but not limited to:

1. Power supplies for industrial equipment
2. Battery-powered devices
3. LED lighting systems
4. Automotive electronics
5. Telecom infrastructure

Its wide input voltage range, adjustable output voltage, and high efficiency make it suitable for diverse power supply designs.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the LM3489QMM/NOPB are:

1. LM2576T-ADJ/NOPB
2. LM2596S-ADJ/NOPB
3. LM2678SX-ADJ/NOPB
4. LM317T/NOPB

These models provide different package options, output current capabilities, and voltage ranges, allowing designers to choose the most suitable option for their specific application requirements.

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