LM4891ITP/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Amplifier

Characteristics: - Single supply voltage: 2.7V to 5.5V - Output power: 1W (8Ω, 10% THD+N) - Low quiescent current: 4mA - Shutdown current: <1µA - Thermal shutdown protection - Short-circuit and thermal overload protection - Small package size: 16-pin TSSOP

Package: Thin Shrink Small Outline Package (TSSOP)

Essence: The LM4891ITP/NOPB is an audio amplifier IC designed for portable devices that require low power consumption and high-quality audio output.

Packaging/Quantity: The LM4891ITP/NOPB is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Quiescent Current: 4mA
• Shutdown Current: <1µA
• Output Power: 1W (8Ω, 10% THD+N)
• Total Harmonic Distortion + Noise (THD+N): 0.1%
• Signal-to-Noise Ratio (SNR): 90dB
• Operating Temperature Range: -40°C to 85°C
• Package Type: 16-pin TSSOP

Pin Configuration

The LM4891ITP/NOPB has the following pin configuration:

```

---

| | | 1 2 3 4 5 6 7 8 9 10| |_______________________________________|

1. VDD
2. SD
3. IN-
4. IN+
5. GND
6. SHUTDOWN
7. BYPASS
8. VOUT
9. VDD
   1. GND ```

Functional Features

• Low quiescent current for power efficiency.
• Shutdown mode for further power savings.
• Thermal shutdown protection to prevent overheating.
• Short-circuit and thermal overload protection for device safety.
• Bypass pin for direct input coupling.
• High-quality audio output with low distortion and noise.

Advantages and Disadvantages

Advantages: - Low power consumption - Small package size - Thermal and short-circuit protection - High-quality audio output

Disadvantages: - Limited output power (1W)

Working Principles

The LM4891ITP/NOPB is a class AB audio amplifier that amplifies the input audio signal and provides a high-quality amplified output. It operates on a single supply voltage ranging from 2.7V to 5.5V. The IC features a shutdown mode, which reduces the quiescent current to less than 1µA, enabling power savings when the amplifier is not in use.

The LM4891ITP/NOPB also incorporates thermal shutdown protection, which prevents the device from overheating. In case of a short circuit or thermal overload, the amplifier automatically shuts down to protect itself and the connected components.

The IC offers a bypass pin that allows direct input coupling, eliminating the need for an external DC-blocking capacitor. This feature simplifies the design and reduces component count.

Detailed Application Field Plans

The LM4891ITP/NOPB is commonly used in various portable audio devices, including:

1. Mobile phones
2. Tablets
3. Portable media players
4. Bluetooth speakers
5. Portable gaming devices

Due to its low power consumption, small package size, and high-quality audio output, the LM4891ITP/NOPB is well-suited for applications where space and power efficiency are crucial.

Detailed and Complete Alternative Models

Some alternative models to the LM4891ITP/NOPB that offer similar functionality include:

1. TPA301DGNR
2. MAX98357AETE+T
3. PAM8406DR
4. TS4990IST
5. NJM2073D

These alternative models can be considered based on specific application requirements and availability in the market.

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