LM4947TL/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: Low Power, Stereo, Class AB
• Package: Thin Shrink Small Outline Package (TSSOP)
• Essence: Amplification of audio signals
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 2.5V to 5.5V
• Output Power: 1.2W per channel into 8Ω load at 5V supply
• Total Harmonic Distortion + Noise: 0.1% at 1kHz, 1.2W output power
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4947TL/NOPB IC has a total of 20 pins. The pin configuration is as follows:

1. VDD
2. GND
3. SHUTDOWN
4. BYPASS
5. INL-
6. INL+
7. INR+
8. INR-
9. OUTR+
10. OUTR-
11. OUTL-
12. OUTL+
13. AGND
14. VREF
15. VCOM
16. VDD
17. VDD
18. VDD
19. VDD
20. VDD

Functional Features

• Low power consumption
• Stereo audio amplification
• Class AB amplifier architecture
• Shutdown mode for power saving
• Bypass mode for direct signal routing
• Differential input configuration for improved noise rejection
• Short-circuit and thermal protection

Advantages and Disadvantages

Advantages: - Low power consumption makes it suitable for battery-powered devices - Stereo output allows for immersive audio experience - Class AB architecture provides efficient amplification with low distortion - Shutdown mode helps conserve power when not in use - Bypass mode enables direct signal routing without amplification

Disadvantages: - Limited output power may not be sufficient for high-power audio applications - Requires external components for proper operation - Sensitive to improper grounding and layout design

Working Principles

The LM4947TL/NOPB is an audio amplifier IC designed to amplify stereo audio signals. It operates on a supply voltage ranging from 2.5V to 5.5V, making it suitable for various portable electronic devices. The class AB amplifier architecture ensures efficient power utilization while minimizing distortion.

The IC features differential inputs (INL+/- and INR+/-) that provide improved noise rejection compared to single-ended inputs. It also includes short-circuit and thermal protection mechanisms to safeguard the device and connected speakers.

By controlling the SHUTDOWN pin, the amplifier can be put into a low-power standby mode, reducing power consumption when not in use. The BYPASS pin allows for direct signal routing without amplification, useful in certain applications where amplification is not required.

Detailed Application Field Plans

The LM4947TL/NOPB finds applications in various audio amplification scenarios, including but not limited to:

1. Portable audio devices such as smartphones, tablets, and MP3 players
2. Bluetooth speakers and wireless headphones
3. Automotive audio systems
4. Home theater systems
5. Gaming consoles and multimedia devices

Its low power consumption, compact package, and stereo output make it suitable for space-constrained and battery-powered applications.

Detailed and Complete Alternative Models

1. TPA3116D2: A higher-power audio amplifier IC with integrated digital-to-analog converter (DAC).
2. LM386: A low-power audio amplifier IC suitable for simple audio amplification applications.
3. TDA7294: A high-power audio amplifier IC designed for home theater and professional audio systems.
4. MAX9744: A compact audio amplifier IC with integrated volume control and automatic gain control (AGC) features.

These alternative models offer different power levels, features, and package options to cater to diverse audio amplification requirements.

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