LM4838MT/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Amplifier

Characteristics: - Mono Class D Audio Power Amplifier - Low power consumption - High efficiency - Small package size - Suitable for portable audio devices

Package: 20-TSSOP (Thin Shrink Small Outline Package)

Essence: The LM4838MT/NOPB is a mono class D audio power amplifier designed for low power consumption and high efficiency. It is commonly used in portable audio devices to amplify audio signals.

Packaging/Quantity: The LM4838MT/NOPB is available in a 20-TSSOP package. It is typically sold in reels containing a quantity of 2500 units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Output Power: Up to 1.3W into 8Ω at 5V
• Efficiency: Up to 90%
• Total Harmonic Distortion + Noise (THD+N): 0.1% at 1kHz, 1.2W into 8Ω
• Shutdown Current: <1µA
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4838MT/NOPB has a total of 20 pins. The pin configuration is as follows:

1. SD (Shutdown)
2. IN-
3. IN+
4. GND (Ground)
5. VDD (Power Supply)
6. BYP (Bypass)
7. BPVDD (Bootstrap Power Supply)
8. BST (Bootstrap)
9. OUT
10. PVDD (Power Supply)
11. PGND (Power Ground)
12. AGND (Analog Ground)
13. VREF (Reference Voltage)
14. VCM (Common Mode Voltage)
15. VDDC (Charge Pump Power Supply)
16. CP1 (Charge Pump Capacitor 1)
17. CP2 (Charge Pump Capacitor 2)
18. CP3 (Charge Pump Capacitor 3)
19. CP4 (Charge Pump Capacitor 4)
20. CP5 (Charge Pump Capacitor 5)

Functional Features

• Low power consumption: The LM4838MT/NOPB is designed to operate with a low supply voltage, resulting in reduced power consumption.
• High efficiency: The class D amplifier architecture ensures high efficiency, minimizing power wastage.
• Small package size: The 20-TSSOP package allows for compact designs, making it suitable for portable audio devices.
• Shutdown mode: The SD pin can be used to put the amplifier into a low-power shutdown mode when not in use.

Advantages and Disadvantages

Advantages: - Low power consumption - High efficiency - Compact size - Suitable for portable audio devices

Disadvantages: - Mono output only - Limited output power compared to larger amplifiers

Working Principles

The LM4838MT/NOPB is a mono class D audio power amplifier. It utilizes pulse width modulation (PWM) to convert the input audio signal into a series of pulses. These pulses are then amplified and filtered to produce the amplified audio output.

The class D amplifier architecture allows for high efficiency by switching the output stage between fully on and fully off states. This minimizes power dissipation and maximizes energy transfer to the load.

Detailed Application Field Plans

The LM4838MT/NOPB is commonly used in various portable audio devices, including: - Mobile phones - MP3 players - Portable gaming consoles - Bluetooth speakers - Personal digital assistants (PDAs)

Its small package size, low power consumption, and high efficiency make it ideal for these applications where space and battery life are critical factors.

Detailed and Complete Alternative Models

• TPA3116D2: Stereo class D audio amplifier with higher output power and additional features.
• LM386: Mono audio amplifier with lower power and simpler design.
• MAX98357A: Class AB audio amplifier with integrated digital-to-analog converter (DAC).

These alternative models offer different specifications and features, allowing designers to choose the most suitable amplifier for their specific application requirements.

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