LM48557TL/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Amplifier

Characteristics: - Low power consumption - High efficiency - Small package size - Wide operating voltage range

Package: Thin Shrink Small Outline Package (TSSOP)

Essence: The LM48557TL/NOPB is a low-power audio amplifier IC designed for portable electronic devices such as smartphones, tablets, and portable media players.

Packaging/Quantity: The LM48557TL/NOPB is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.5V to 5.5V
• Output Power: Up to 1.4W per channel into 8Ω load at 5V supply
• Total Harmonic Distortion + Noise (THD+N): 0.03% at 1kHz, 1.2W output power
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The LM48557TL/NOPB has a total of 20 pins arranged as follows:

1. VDD (Power Supply)
2. GND (Ground)
3. SD (Shutdown Control)
4. INL- (Left Channel Negative Input)
5. INL+ (Left Channel Positive Input)
6. BYP (Bypass Capacitor Connection)
7. OUTL (Left Channel Output)
8. PVDD (Power Supply)
9. PGND (Ground)
10. INR- (Right Channel Negative Input)
11. INR+ (Right Channel Positive Input)
12. SHDN (Shutdown Control)
13. OUTR (Right Channel Output)
14. BIAS (Bias Voltage Output)
15. BST (Boost Capacitor Connection)
16. VDDC (Power Supply)
17. GND (Ground)
18. BCL (Bypass Capacitor Connection)
19. BCR (Bypass Capacitor Connection)
20. VDDA (Analog Power Supply)

Functional Features

• Class D amplifier architecture for high efficiency
• Integrated boost converter for improved power efficiency
• Short-circuit and thermal protection
• Pop and click suppression during power-up and shutdown
• Low quiescent current in shutdown mode

Advantages and Disadvantages

Advantages: - Low power consumption extends battery life in portable devices - High efficiency reduces heat dissipation - Small package size allows for compact designs - Wide operating voltage range provides flexibility in various applications

Disadvantages: - Limited output power compared to larger audio amplifiers - Requires external components for proper operation - Sensitive to electromagnetic interference (EMI)

Working Principles

The LM48557TL/NOPB is a class D audio amplifier that utilizes pulse-width modulation (PWM) to convert the input audio signal into a high-frequency square wave. This square wave is then filtered and amplified to drive the connected speakers or headphones.

The integrated boost converter increases the supply voltage to ensure sufficient power delivery to the speakers, while the pop and click suppression circuitry eliminates any unwanted noise during power-up and shutdown.

Detailed Application Field Plans

The LM48557TL/NOPB is commonly used in various portable electronic devices, including: - Smartphones - Tablets - Portable media players - Bluetooth speakers - Gaming consoles

Its low power consumption, small package size, and high efficiency make it ideal for battery-powered devices where space and energy efficiency are crucial.

Detailed and Complete Alternative Models

1. TPA3116D2: A higher-power class D audio amplifier with built-in digital-to-analog converter (DAC).
2. MAX98357A: A compact class D audio amplifier with integrated digital audio interface.
3. TDA7498E: A dual-channel class D audio amplifier with higher output power capabilities.

These alternative models offer different features and specifications, providing options for various audio amplification requirements.