LM4950TA/NOPB

Product Overview

Category: Audio Amplifier
Use: Audio amplification in electronic devices
Characteristics: High efficiency, low distortion, compact size
Package: 14-pin TSSOP
Essence: LM4950TA/NOPB is a high-performance audio amplifier designed for use in portable electronic devices. It offers high efficiency and low distortion, making it ideal for applications where space is limited.
Packaging/Quantity: Available in reels of 2500 units

Specifications

• Output Power: 1.1W (typical) into 8Ω at 5V
• Total Harmonic Distortion + Noise (THD+N): 0.2% (typical) at 1kHz, 0.4W
• Efficiency: 88% (typical) at 125mW, 8Ω
• Shutdown Current: 0.6μA (typical)
• Operating Voltage Range: 2.0V to 5.5V
• Quiescent Current: 4mA (typical)

Detailed Pin Configuration

1. SHUTDOWN (Pin 1): Logic input for shutdown mode
2. IN- (Pin 2): Negative differential audio input
3. IN+ (Pin 3): Positive differential audio input
4. GND (Pin 4): Ground
5. VDD (Pin 5): Power supply voltage
6. BYPASS (Pin 6): Bypass pin for power supply filtering
7. MODE (Pin 7): Mode selection pin
8. MUTE (Pin 8): Logic input for mute control
9. OUT (Pin 9): Speaker output
10. VREF (Pin 10): Reference voltage output
11. VDD (Pin 11): Power supply voltage
12. BYPASS (Pin 12): Bypass pin for power supply filtering
13. IN+ (Pin 13): Positive differential audio input
14. IN- (Pin 14): Negative differential audio input

Functional Features

• Low quiescent current
• Shutdown and mute control
• Thermal shutdown protection
• Short-circuit and thermal overload protection
• Wide operating voltage range

Advantages and Disadvantages

Advantages: - High efficiency - Low distortion - Compact size - Shutdown and mute control features - Thermal and short-circuit protection

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

Working Principles

LM4950TA/NOPB operates as a class AB audio amplifier, utilizing differential inputs to amplify the audio signal. The device incorporates shutdown and mute control features to minimize power consumption and provide user control over the audio output.

Detailed Application Field Plans

The LM4950TA/NOPB is suitable for various portable electronic devices, including: - Mobile phones - Portable media players - Bluetooth speakers - Handheld gaming devices - Personal digital assistants (PDAs)

Detailed and Complete Alternative Models

• LM4863: Higher output power (3W) audio amplifier
• LM4880: Mono bridge-tied load (BTL) audio amplifier
• LM4871: Stereo audio amplifier with DC volume control

LM4950TA/NOPB provides a balance of performance and efficiency for applications requiring compact audio amplification solutions.

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