LM4673TM/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: High-performance, stereo audio amplifier with integrated volume control and shutdown function.
• Package: 24-pin HTSSOP package
• Essence: The LM4673TM/NOPB is a versatile audio amplifier designed for various applications requiring high-quality sound amplification.
• Packaging/Quantity: Available in tape and reel packaging, with a quantity of 2500 units per reel.

Specifications

• Power Supply Voltage: 2.7V to 5.5V
• Output Power: Up to 1.2W per channel into 8Ω load
• Total Harmonic Distortion + Noise: 0.03% at 1kHz, 1W output power
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4673TM/NOPB has a 24-pin HTSSOP package with the following pin configuration:

1. SDN (Shutdown) - Shutdown control input
2. VDD - Positive power supply voltage
3. GND - Ground
4. INL- (Left Channel Input) - Non-inverting input for the left channel
5. INL+ (Left Channel Input) - Inverting input for the left channel
6. BYP - Bypass capacitor connection
7. OUTL- (Left Channel Output) - Non-inverting output for the left channel
8. OUTL+ (Left Channel Output) - Inverting output for the left channel
9. AGND - Analog ground
10. PVDD - Positive power supply voltage for the headphone amplifier
11. PGND - Ground for the headphone amplifier
12. OUTR+ (Right Channel Output) - Inverting output for the right channel
13. OUTR- (Right Channel Output) - Non-inverting output for the right channel
14. INR+ (Right Channel Input) - Inverting input for the right channel
15. INR- (Right Channel Input) - Non-inverting input for the right channel
16. VREF - Reference voltage output
17. VCM - Common-mode voltage output
18. VCOM - Common-mode voltage input
19. VDDC - Positive power supply voltage for the charge pump
20. CP1 - Charge pump capacitor connection
21. CP2 - Charge pump capacitor connection
22. CP3 - Charge pump capacitor connection
23. CP4 - Charge pump capacitor connection
24. GND - Ground

Functional Features

• Integrated volume control with a range of -34dB to +12dB in 2dB steps.
• Shutdown function for power-saving mode.
• Low quiescent current consumption.
• Thermal shutdown protection.

Advantages and Disadvantages

Advantages: - High-quality audio amplification. - Integrated volume control simplifies system design. - Power-saving shutdown function. - Wide operating temperature range.

Disadvantages: - Limited output power compared to higher wattage amplifiers. - Requires external components for proper operation.

Working Principles

The LM4673TM/NOPB is a class AB audio amplifier that utilizes a charge pump to generate a negative supply voltage, allowing it to drive both positive and negative signals. It features a differential input stage, which provides excellent common-mode rejection and minimizes noise interference. The integrated volume control allows for easy adjustment of the audio output level.

Detailed Application Field Plans

The LM4673TM/NOPB is suitable for various applications, including:

1. Portable audio devices
2. Mobile phones and smartphones
3. Tablets and laptops
4. Gaming consoles
5. Personal computers

Detailed and Complete Alternative Models

1. LM4863 - Stereo 2.2W Audio Power Amplifier
2. TPA3116D2 - 50W Stereo Class D Audio Amplifier
3. MAX9744 - 20W Stereo Class D Audio Power Amplifier
4. TDA7498E - 160W Dual BTL Class-D Audio Amplifier

These alternative models offer different power outputs, features, and package options, providing flexibility for various audio amplification requirements.

In conclusion, the LM4673TM/NOPB is a high-performance audio amplifier designed for applications requiring quality sound amplification. With its integrated volume control, shutdown function, and wide operating temperature range, it offers convenience and versatility. However, it has limited output power compared to higher wattage amplifiers and requires external components for proper operation. It finds applications in portable audio devices, mobile phones, tablets, gaming consoles, and personal computers. Alternative models such as LM4863, TPA3116D