Overview
The LM4871MX is a mono bridged audio power amplifier produced by National Semiconductor, now part of Texas Instruments. This amplifier is capable of delivering 3W of continuous average power into a 3Ω load with less than 10% Total Harmonic Distortion (THD) when powered by a 5V power supply. It is designed to provide high power and high fidelity audio output, making it suitable for various audio applications. The LM4871MX features a micropower shutdown mode, thermal shutdown protection, and unity-gain stability, which are essential for efficient and reliable operation in portable and low-power systems.
Key Specifications
| Parameter | Conditions | Units | Min | Typical | Max |
|---|---|---|---|---|---|
| Supply Voltage (VDD) | V | 2.0 | 5.5 | ||
| Output Power (PO) at 10% THD+N, 1kHz | RL = 3Ω | W | 3 | ||
| Output Power (PO) at 10% THD+N, 1kHz | RL = 8Ω | W | 1.5 | ||
| Quiescent Power Supply Current (IDD) | VIN = 0V, Io = 0A | mA | 6.5 | 10.0 | |
| Shutdown Current (ISD) | VPIN1 = VDD | µA | 0.6 | 2 | |
| Output Offset Voltage (VOS) | VIN = 0V | mV | 5.0 | 50 | |
| THD at 1kHz at 1W Continuous Average Output Power into 8Ω | % | 0.5 | |||
| Power Supply Rejection Ratio (PSRR) | dB | 60 |
Key Features
- No output coupling capacitors, bootstrap capacitors, or snubber circuits required.
- Unity-gain stable.
- External gain configuration capability.
- Micropower shutdown mode (IQ = 0.6µA, typ) activated when VDD is applied to the SHUTDOWN pin.
- Thermal shutdown protection.
- Available in WSON, VSSOP, SOIC, or PDIP packaging.
- Operates on low supply voltages from 2.0V to 5.5V.
Applications
- Portable computers.
- Desktop computers.
- Low voltage audio systems.
The LM4871MX is ideally suited for low-power portable systems that require minimum volume and weight, making it a versatile choice for various audio applications.
Q & A
- What is the LM4871MX?
The LM4871MX is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V power supply.
- What is the supply voltage range of the LM4871MX?
The supply voltage range is from 2.0V to 5.5V.
- What is the typical output power of the LM4871MX into an 8Ω load?
The typical output power into an 8Ω load is 1.5W at 10% THD+N.
- What is the quiescent power supply current of the LM4871MX?
The quiescent power supply current is typically 10.0 mA.
- What is the shutdown current of the LM4871MX?
The shutdown current is typically 0.6 µA.
- What type of packaging is available for the LM4871MX?
The LM4871MX is available in WSON, VSSOP, SOIC, or PDIP packaging.
- Does the LM4871MX require output coupling capacitors or snubber circuits?
No, the LM4871MX does not require output coupling capacitors, bootstrap capacitors, or snubber circuits.
- What is the power supply rejection ratio (PSRR) of the LM4871MX?
The PSRR is 60 dB.
- What are some common applications of the LM4871MX?
Common applications include portable computers, desktop computers, and low voltage audio systems.
- How is the micropower shutdown mode activated in the LM4871MX?
The micropower shutdown mode is activated when VDD is applied to the SHUTDOWN pin.
