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LM4921ITLX/NOPB
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LM4921ITLX/NOPB

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Audio Amplifier
  • Characteristics: Low Noise, High Efficiency
  • Package: Thin SOT-23-5
  • Essence: Single Supply, Mono Class AB Audio Amplifier
  • Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

  • Supply Voltage: 2.7V to 5.5V
  • Output Power: 1.2W into 8Ω at 5V
  • Total Harmonic Distortion + Noise: 0.1% (typical) at 1kHz, 1.2W
  • Quiescent Current: 3.6mA (typical)
  • Shutdown Current: 0.01μA (typical)
  • Shutdown Pin Threshold Voltage: 0.4V (typical)

Detailed Pin Configuration

The LM4921ITLX/NOPB has a total of five pins:

  1. IN-: Negative input pin
  2. IN+: Positive input pin
  3. GND: Ground pin
  4. SHUTDOWN: Shutdown control pin
  5. OUT: Output pin

Functional Features

  • Single supply operation simplifies design
  • Low noise and distortion for high-quality audio reproduction
  • Shutdown mode for power-saving functionality
  • Thermal shutdown protection prevents overheating
  • Short-circuit and thermal overload protection for increased reliability

Advantages and Disadvantages

Advantages

  • Wide supply voltage range allows flexibility in system design
  • Small package size enables space-saving integration
  • Low quiescent current minimizes power consumption
  • High efficiency results in longer battery life
  • Excellent audio performance with low distortion and noise

Disadvantages

  • Limited output power may not be suitable for high-power audio applications
  • Mono configuration restricts stereo sound reproduction

Working Principles

The LM4921ITLX/NOPB is a mono class AB audio amplifier designed to amplify audio signals with low distortion and noise. It operates on a single supply voltage, making it suitable for portable devices. The input audio signal is amplified and delivered to the output pin while maintaining high fidelity.

The shutdown pin allows the amplifier to enter a low-power mode when not in use, reducing power consumption. Thermal shutdown protection ensures that the IC does not overheat during operation, enhancing its reliability.

Detailed Application Field Plans

The LM4921ITLX/NOPB is commonly used in various audio applications, including:

  1. Portable media players
  2. Mobile phones
  3. Tablets
  4. Laptop computers
  5. Bluetooth speakers
  6. Gaming consoles

Its small package size and low power consumption make it ideal for space-constrained and battery-powered devices.

Detailed and Complete Alternative Models

  1. LM4861: Stereo Class AB Audio Amplifier
  2. LM386: Low Voltage Audio Power Amplifier
  3. TPA3110D2: Stereo Class D Audio Amplifier
  4. MAX9744: Mono Class D Audio Amplifier
  5. TDA7052: Mono Audio Amplifier with DC Volume Control

These alternative models offer different features and specifications, providing options for various audio amplifier requirements.

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Lista 10 Vanliga frågor och svar relaterade till tillämpningen av LM4921ITLX/NOPB i tekniska lösningar

  1. Question: What is the typical application of LM4921ITLX/NOPB?
    Answer: The LM4921ITLX/NOPB is commonly used as a mono, bridge-tied load (BTL) audio amplifier in portable devices such as smartphones and tablets.

  2. Question: What is the maximum power output of LM4921ITLX/NOPB?
    Answer: The LM4921ITLX/NOPB can deliver up to 1.1W of continuous average power into an 8Ω BTL load with less than 1% THD+N.

  3. Question: What is the supply voltage range for LM4921ITLX/NOPB?
    Answer: The LM4921ITLX/NOPB operates from a single 2.4V to 5.5V supply, making it suitable for battery-powered applications.

  4. Question: Does LM4921ITLX/NOPB require external coupling capacitors?
    Answer: No, the LM4921ITLX/NOPB does not require external coupling capacitors, which simplifies the design and reduces board space.

  5. Question: Can LM4921ITLX/NOPB operate in shutdown mode?
    Answer: Yes, the LM4921ITLX/NOPB features a low-power shutdown mode, which helps conserve battery life in portable applications.

  6. Question: What is the typical quiescent current of LM4921ITLX/NOPB?
    Answer: The typical quiescent current of LM4921ITLX/NOPB is 2.5mA, making it suitable for battery-powered devices.

  7. Question: Is thermal shutdown protection included in LM4921ITLX/NOPB?
    Answer: Yes, the LM4921ITLX/NOPB includes thermal shutdown protection to prevent the device from overheating.

  8. Question: Can LM4921ITLX/NOPB drive headphones directly?
    Answer: Yes, the LM4921ITLX/NOPB can directly drive headphones with an impedance as low as 16Ω.

  9. Question: What is the typical gain setting for LM4921ITLX/NOPB?
    Answer: The typical gain setting for LM4921ITLX/NOPB is 6dB, providing flexibility for different input signal levels.

  10. Question: Does LM4921ITLX/NOPB include short-circuit and overvoltage protection?
    Answer: Yes, the LM4921ITLX/NOPB includes short-circuit and overvoltage protection to safeguard the device and connected components.