LM4898LD/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Amplifier

Characteristics: - Small size and low power consumption - High audio quality and efficiency - Wide supply voltage range - Built-in thermal shutdown protection - Short-circuit and overcurrent protection

Package: DSBGA (Dual Sided Ball Grid Array)

Essence: The LM4898LD/NOPB is a mono bridge-tied load (BTL) audio amplifier IC designed for portable devices such as smartphones, tablets, and portable media players. It provides high-quality audio amplification with low power consumption.

Packaging/Quantity: The LM4898LD/NOPB is typically sold in reels or tubes containing a specified quantity of ICs.

Specifications

• Supply Voltage Range: 2.5V to 5.5V
• Output Power: Up to 1.1W into 8Ω at 5V
• Total Harmonic Distortion + Noise (THD+N): 0.1% (typical)
• Shutdown Current: <1µA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4898LD/NOPB has a total of 9 pins:

1. SHUTDOWN (SDN): Shutdown control pin
2. GAIN: Gain selection pin
3. BYPASS: Bypass capacitor connection pin
4. IN-: Negative input pin
5. IN+: Positive input pin
6. VDD: Positive supply voltage pin
7. OUT: Speaker output pin
8. GND: Ground pin
9. BYPASS: Bypass capacitor connection pin

Functional Features

• Low quiescent current consumption
• Pop and click suppression during power-up and shutdown
• Thermal shutdown protection
• Short-circuit and overcurrent protection
• Gain selection for different audio input levels

Advantages

• Small size and low power consumption make it suitable for portable devices
• High audio quality with low distortion
• Wide supply voltage range allows flexibility in power source selection
• Built-in protection features enhance reliability and prevent damage to the IC and connected components

Disadvantages

• Limited output power compared to larger audio amplifiers
• Mono output limits stereo sound reproduction

Working Principles

The LM4898LD/NOPB is a bridge-tied load (BTL) amplifier, which means it can drive a speaker without the need for an output coupling capacitor. It utilizes a differential input stage and a BTL output stage to amplify the audio signal. The gain of the amplifier can be adjusted using the GAIN pin.

When an audio signal is applied to the input pins (IN+ and IN-), the LM4898LD/NOPB amplifies it and outputs the amplified signal through the OUT pin to the connected speaker. The amplifier operates within the specified supply voltage range and incorporates various protection mechanisms to ensure safe operation.

Detailed Application Field Plans

The LM4898LD/NOPB is commonly used in portable electronic devices that require audio amplification, such as: - Smartphones - Tablets - Portable media players - Bluetooth speakers - Gaming consoles

Detailed and Complete Alternative Models

• LM4861: Stereo audio amplifier with similar characteristics and package
• LM4889: Higher power mono audio amplifier with BTL configuration
• TPA3110D2: Digital audio amplifier with higher power and integrated digital-to-analog converter (DAC)

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

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