Overview
The LM4876MX/NOPB is a 1.1W audio power amplifier produced by Texas Instruments. This device is part of the Boomer series and is designed to deliver high-quality audio output with minimal external components. It operates on a single 5V supply and is available in both 10-pin VSSOP and 8-pin SOIC packages, making it suitable for low-power portable systems. The LM4876 features an active low externally controlled shutdown mode and internal thermal shutdown protection, enhancing its reliability and efficiency.
Key Specifications
| Parameter | Conditions | Typical | Limit |
|---|---|---|---|
| Supply Voltage | 2.0V to 5.5V | - | 2.0V (min), 5.5V (max) |
| Output Power at 1kHz into 8Ω | THD+N = 0.5% | 1.1W | 1.0W (min) |
| THD+N at 1kHz for 1W Continuous Average Output Power into 8Ω | - | 0.5% (max) | - |
| Shutdown Current | VPIN1 = 0V | 0.01µA | 2µA (max) |
| Output Offset Voltage | VIN = 0V | 5mV | 50mV (max) |
| Power Supply Rejection Ratio (PSRR) | VDD = 4.9V to 5.1V | 65dB | - |
| Operating Temperature Range | - | -40°C to 85°C | - |
Key Features
- Does not require output coupling capacitors, bootstrap capacitors, or snubber circuits.
- Unity-gain stable with external gain set using resistors.
- Active low externally controlled shutdown mode.
- Internal thermal shutdown protection.
- Available in 10-pin VSSOP and 8-pin SOIC packages for PCB space efficiency.
- Bridge mode operation for increased output power.
Applications
- Mobile Phones
- Portable Computers
- Desktop Computers
- Low-Voltage Audio Systems
Q & A
- What is the typical output power of the LM4876MX/NOPB at 1kHz into an 8Ω load?
The typical output power is 1.1W with a THD+N of 0.5%.
- What is the shutdown current of the LM4876MX/NOPB?
The shutdown current is typically 0.01µA when VPIN1 = 0V.
- What is the supply voltage range for the LM4876MX/NOPB?
The supply voltage range is from 2.0V to 5.5V.
- Does the LM4876MX/NOPB require output coupling capacitors or bootstrap capacitors?
No, it does not require output coupling capacitors, bootstrap capacitors, or snubber circuits.
- What are the package options for the LM4876MX/NOPB?
The device is available in 10-pin VSSOP and 8-pin SOIC packages.
- What is the operating temperature range for the LM4876MX/NOPB?
The operating temperature range is from -40°C to 85°C.
- How does the LM4876MX/NOPB protect against thermal issues?
The device features internal thermal shutdown protection.
- What is the power supply rejection ratio (PSRR) of the LM4876MX/NOPB?
The PSRR is 65dB for VDD = 4.9V to 5.1V.
- Can the LM4876MX/NOPB be used in bridge mode?
- What are some common applications for the LM4876MX/NOPB?
