MAX9485ETP-T

Overview

Category: Integrated Circuit
Use: Audio Amplifier
Characteristics: High Efficiency, Low Noise
Package: TQFN-20
Essence: Class D Audio Power Amplifier
Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications and Parameters

Supply Voltage: 2.7V to 5.5V
Output Power: 3.2W (4Ω, 5V)
Efficiency: 87% (4Ω, 5V)
THD+N: 0.03% (1kHz, 1W)
Shutdown Current: 0.1μA (typical)

Pin Configuration

```

| | --| VDD | --| GND | --| IN+ | --| IN- | --| SD | --| SHDN | --| OUT | --| FB | --| PGND | --| AGND | --| BP | --| BST | --| PVDD | --| PVSS | --| NC | --| NC | --| NC | --| NC | |___________| ```

Functional Characteristics

The MAX9485ETP-T is a high-efficiency Class D audio power amplifier designed for portable devices. It offers low noise and excellent audio quality. The device operates from a supply voltage range of 2.7V to 5.5V, making it suitable for various battery-powered applications.

The amplifier features a shutdown mode (SD) and a shutdown input (SHDN), allowing for power-saving operation when not in use. It also includes protection features such as thermal shutdown and overcurrent protection.

Advantages and Disadvantages

Advantages: - High efficiency - Low noise - Small package size - Shutdown mode for power-saving operation - Thermal shutdown and overcurrent protection

Disadvantages: - Limited output power (3.2W)

Applicable Range of Products

The MAX9485ETP-T is suitable for a wide range of portable audio applications, including smartphones, tablets, portable media players, and Bluetooth speakers.

Working Principles

The MAX9485ETP-T utilizes Class D amplification technology to achieve high efficiency. It converts the input audio signal into a pulse-width modulated (PWM) signal, which is then amplified by the power stage. The PWM signal allows for efficient power transfer to the load, resulting in minimal power loss and high energy efficiency.

Detailed Application Field Plans

Smartphone audio amplification: The MAX9485ETP-T can be used to enhance the audio output of smartphones, providing improved sound quality and volume.
Portable media player: Incorporating the amplifier into portable media players enables better audio performance, enhancing the user's listening experience.
Bluetooth speaker: The MAX9485ETP-T can drive the speakers in Bluetooth speakers, delivering clear and powerful sound wirelessly.
Tablet audio enhancement: Tablets can benefit from the amplifier's low noise characteristics, ensuring high-quality audio playback.
Gaming devices: By integrating the MAX9485ETP-T, gaming devices can produce immersive sound effects, enhancing the gaming experience.

Detailed Alternative Models

MAX98357A: Another Class D audio amplifier with similar specifications and features.
TPA3116D2: A popular Class D amplifier offering higher output power and advanced features.
TAS5720: A digital input Class D amplifier with integrated audio processing capabilities.
LM386: A low-cost audio amplifier suitable for simple applications with lower power requirements.
PAM8403: A compact Class D amplifier designed for portable audio devices.

5 Common Technical Questions and Answers

Q: What is the maximum output power of the MAX9485ETP-T? A: The maximum output power is 3.2W when driving a 4Ω load with a 5V supply.
Q: Can the amplifier operate from a single supply voltage? A: Yes, the MAX9485ETP-T can operate from a supply voltage range of 2.7V to 5.5V.
Q: Does the amplifier have thermal protection? A: Yes, the device includes thermal shutdown protection to prevent overheating.
Q: What is the shutdown current of the MAX9485ETP-T? A: The shutdown current is typically 0.1μA, ensuring minimal power consumption in standby mode.
Q: Is the MAX9485ETP-T suitable for battery-powered applications? A: Yes, the amplifier's low supply voltage range and high efficiency make it ideal for battery-powered devices.

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