LM4845ITL/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: Low power, stereo audio amplifier
• Package: Thin Shrink Small Outline Package (TSSOP)
• Essence: Provides high-quality audio amplification in portable devices
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Power Supply Voltage: 2.7V to 5.5V
• Output Power: 1.2W per channel into 8Ω load at 5V supply
• Total Harmonic Distortion + Noise: 0.1% (typical) at 1kHz, 1.2W output power
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4845ITL/NOPB IC has a total of 20 pins. The pin configuration is as follows:

1. SDN (Shutdown) - Shutdown control input
2. INL- (Left Channel Negative Input) - Inverting input for the left channel
3. INL+ (Left Channel Positive Input) - Non-inverting input for the left channel
4. VDD (Positive Power Supply) - Positive power supply voltage
5. PVDD (Positive Power Supply) - Positive power supply voltage
6. OUTL (Left Channel Output) - Output for the left channel
7. GND (Ground) - Ground reference
8. OUTR (Right Channel Output) - Output for the right channel
9. INR+ (Right Channel Positive Input) - Non-inverting input for the right channel
10. INR- (Right Channel Negative Input) - Inverting input for the right channel
11. VDD (Positive Power Supply) - Positive power supply voltage
12. PVDD (Positive Power Supply) - Positive power supply voltage
13. BYP (Bypass Capacitor) - Bypass capacitor connection
14. GND (Ground) - Ground reference
15. VREF (Reference Voltage) - Reference voltage output
16. VCM (Common Mode Voltage) - Common mode voltage output
17. VDD (Positive Power Supply) - Positive power supply voltage
18. PVDD (Positive Power Supply) - Positive power supply voltage
19. INL- (Left Channel Negative Input) - Inverting input for the left channel
20. INL+ (Left Channel Positive Input) - Non-inverting input for the left channel

Functional Features

• Low power consumption makes it suitable for portable devices
• Stereo audio amplification for high-quality sound reproduction
• Shutdown control for power-saving mode
• Internal thermal shutdown protection
• Short-circuit and thermal overload protection

Advantages and Disadvantages

Advantages: - Low power consumption - High-quality audio amplification - Shutdown control for power-saving - Built-in protection features

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

Working Principles

The LM4845ITL/NOPB is a stereo audio amplifier IC designed to provide high-quality audio amplification in portable devices. It operates on a low power supply voltage range of 2.7V to 5.5V, making it suitable for battery-powered applications.

The IC utilizes a class AB amplifier architecture to deliver efficient amplification with low distortion. It incorporates internal thermal shutdown protection, short-circuit protection, and thermal overload protection to ensure safe operation.

The shutdown control feature allows the IC to enter a power-saving mode when not in use, reducing power consumption. This makes it ideal for battery-powered devices where energy efficiency is crucial.

Detailed Application Field Plans

The LM4845ITL/NOPB is commonly used in various portable audio applications, including:

1. Mobile phones
2. Portable media players
3. Tablets and laptops
4. Bluetooth speakers
5. Gaming consoles
6. Personal digital assistants (PDAs)

Its low power consumption, compact package, and high-quality audio amplification make it an excellent choice for these applications.

Detailed and Complete Alternative Models

• LM4861: Mono audio amplifier IC with similar specifications
• LM4881: Stereo audio amplifier IC with higher output power
• LM4950: Stereo audio amplifier IC with integrated volume control
• TPA3116D2: Class D audio amplifier IC with higher power efficiency

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

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