LM4855ITLX/NOPB

Product Overview

• Category: Audio Amplifier
• Use: The LM4855ITLX/NOPB is a mono, bridge-tied load (BTL) audio power amplifier designed for use in portable electronic devices.
• Characteristics: It features low quiescent current, low shutdown current, and minimal external component count, making it suitable for battery-powered applications. The package is a tiny 1.4mm x 1.8mm micro SMD package.
• Essence: The essence of the LM4855ITLX/NOPB lies in its ability to deliver high-quality audio amplification in a compact and energy-efficient package.
• Packaging/Quantity: The LM4855ITLX/NOPB is available in a micro SMD package and is typically sold in reels of 3000 units.

Specifications

• Output Power: 1.1W into 8Ω at 3.6V (10% THD+N)
• Quiescent Current: 1.6mA
• Shutdown Current: 0.01μA
• Package Type: Micro SMD
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The LM4855ITLX/NOPB has a total of 9 pins: 1. VDD: Power supply input 2. SHUTDOWN: Shutdown control input 3. BYPASS: Bypass pin for internal charge pump 4. GND: Ground 5. IN-: Negative audio input 6. IN+: Positive audio input 7. BST: Charge pump output 8. OUT-: Negative audio output 9. OUT+: Positive audio output

Functional Features

• Low Quiescent Current: Enables extended battery life in portable devices.
• Shutdown Control: Allows for power conservation when the amplifier is not in use.
• Internal Charge Pump Bypass: Provides flexibility in system design.

Advantages and Disadvantages

Advantages

• Compact Size: Ideal for space-constrained designs.
• Low Power Consumption: Suitable for battery-powered applications.
• Shutdown Functionality: Enables power conservation when not in use.

Disadvantages

• Limited Output Power: May not be suitable for high-power audio applications.

Working Principles

The LM4855ITLX/NOPB operates as a mono, bridge-tied load audio power amplifier. It amplifies the audio signal received at the input and delivers it to the connected speaker or load. The low quiescent and shutdown currents contribute to efficient power usage, while the internal charge pump enhances the overall performance.

Detailed Application Field Plans

The LM4855ITLX/NOPB is well-suited for various portable electronic devices, including smartphones, tablets, portable media players, and handheld gaming consoles. Its compact size, low power consumption, and shutdown functionality make it an ideal choice for applications where space and energy efficiency are critical.

Detailed and Complete Alternative Models

• LM4863: A stereo audio amplifier with similar power efficiency and compact form factor.
• LM4881: A mono, bridge-tied load audio power amplifier with higher output power capability.

In conclusion, the LM4855ITLX/NOPB is a versatile and efficient audio amplifier suitable for a wide range of portable electronic devices, offering a balance of performance, size, and power efficiency.

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