LM4894ITL

Product Overview

Category: Integrated Circuit (IC)

Use: Audio amplifier

Characteristics: - Small size - Low power consumption - High efficiency - Wide voltage range - Excellent audio quality

Package: Thin QFN package

Essence: LM4894ITL is a high-performance audio amplifier IC designed for portable devices.

Packaging/Quantity: Available in tape and reel packaging, with 3000 units per reel.

Specifications

Supply Voltage Range: 2.5V to 5.5V
Output Power: Up to 1.1W
Efficiency: Up to 90%
Total Harmonic Distortion (THD): <0.1%
Shutdown Current: <1µA
Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The LM4894ITL has a total of 16 pins, which are as follows:

VDD: Positive supply voltage
GND: Ground reference
SD: Shutdown control input
INL+: Left channel positive input
INL-: Left channel negative input
BYP: Bypass capacitor connection
OUTL: Left channel output
PVDD: Power supply for the headphone amplifier
VREF: Reference voltage output
INR+: Right channel positive input
INR-: Right channel negative input
OUTR: Right channel output
BST: Boost capacitor connection
VDDC: Charge pump supply voltage
CPVSS: Charge pump ground
CPVDD: Charge pump supply voltage

Functional Features

Class AB amplifier architecture
Automatic gain control (AGC)
Thermal shutdown protection
Short-circuit and overcurrent protection
Pop and click suppression during power-up and shutdown

Advantages and Disadvantages

Advantages: - Small size allows for compact device designs - Low power consumption prolongs battery life - High efficiency reduces heat dissipation - Wide voltage range enables compatibility with various power sources - Excellent audio quality enhances user experience

Disadvantages: - Limited output power compared to larger amplifiers - May require additional external components for specific applications

Working Principles

The LM4894ITL is a class AB audio amplifier that utilizes AGC to maintain consistent output volume levels. It operates by amplifying the input audio signals received from the left and right channels, and then driving the corresponding outputs. The AGC ensures that the output remains within a desired range, preventing distortion or damage to connected speakers or headphones.

Detailed Application Field Plans

The LM4894ITL is commonly used in portable electronic devices such as smartphones, tablets, portable media players, and handheld gaming consoles. Its small size, low power consumption, and high efficiency make it ideal for these applications where space and battery life are crucial factors.

Detailed and Complete Alternative Models

LM4863: Similar audio amplifier IC with higher output power capability.
LM4881: Audio amplifier IC with integrated volume control functionality.
TPA3116D2: Class D audio amplifier IC with higher efficiency and power output.

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

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací LM4894ITL v technických řešeních

Sure! Here are 10 common questions and answers related to the application of LM4894ITL in technical solutions:

Q: What is LM4894ITL? A: LM4894ITL is an audio power amplifier integrated circuit (IC) designed for use in portable devices such as smartphones, tablets, and laptops.
Q: What is the maximum output power of LM4894ITL? A: The maximum output power of LM4894ITL is typically 1.1 Watts into an 8-ohm load with a 5V power supply.
Q: Can LM4894ITL operate on a single power supply voltage? A: Yes, LM4894ITL can operate on a single power supply voltage ranging from 2.7V to 5.5V.
Q: Does LM4894ITL require any external components for operation? A: Yes, LM4894ITL requires a few external components such as capacitors, resistors, and input/output coupling capacitors for proper operation.
Q: What is the typical input impedance of LM4894ITL? A: The typical input impedance of LM4894ITL is around 20 kilohms.
Q: Can LM4894ITL drive both speakers and headphones? A: Yes, LM4894ITL can drive both speakers and headphones, making it suitable for various audio applications.
Q: Is LM4894ITL capable of driving stereo audio signals? A: Yes, LM4894ITL is a stereo audio power amplifier, capable of driving two separate audio channels.
Q: Can LM4894ITL be used in battery-powered devices? A: Yes, LM4894ITL is designed for low power consumption and can be used in battery-powered devices.
Q: Does LM4894ITL have any built-in protection features? A: Yes, LM4894ITL includes built-in thermal shutdown and short-circuit protection to prevent damage to the IC and connected components.
Q: What is the package type of LM4894ITL? A: LM4894ITL is available in a small outline 24-pin leadless package (LLP) for space-constrained applications.

Please note that these answers are general and may vary depending on the specific application and implementation of LM4894ITL.