Overview
The LM4871MM/NOPB, produced by Texas Instruments, is a mono bridged audio power amplifier designed to deliver high-quality audio output with minimal external components. This amplifier is capable of providing 3W of continuous average power into a 3Ω load with less than 10% Total Harmonic Distortion (THD) when powered by a 5V supply. It is particularly suited for low-power portable systems due to its low supply voltage range of 2.0V to 5.5V and micropower shutdown mode, which reduces power consumption to 0.6µA when not in use.
Key Specifications
| Parameter | Conditions | Units | Typical Value |
|---|---|---|---|
| Output Power at 10% THD+N, 1kHz | RL = 3Ω, VDD = 5V | W | 3W |
| Output Power at 10% THD+N, 1kHz | RL = 4Ω, VDD = 5V | W | 2.5W |
| Output Power at 10% THD+N, 1kHz | RL = 8Ω, VDD = 5V | W | 1.5W |
| Supply Voltage Range | V | 2.0V to 5.5V | |
| Quiescent Power Supply Current | VIN = 0V, Io = 0A | mA | 6.5 mA |
| Shutdown Current | VPIN1 = VDD | µA | 0.6 µA |
| Power Supply Rejection Ratio (PSRR) | VDD = 4.9V to 5.1V | dB | 60 dB |
| Total Harmonic Distortion + Noise (THD+N) | 20Hz ≤ f ≤ 20kHz, AVD = 2 | % | 0.25% |
| Operating Temperature Range | °C | -40°C to 85°C |
Key Features
- No output coupling capacitors, bootstrap capacitors, or snubber circuits required.
- Unity-gain stable.
- External gain configuration capability.
- Thermal shutdown protection.
- Micropower shutdown mode (IQ = 0.6µA, typ).
- Available in WSON, VSSOP, SOIC, or PDIP packaging.
- Pin compatible with the LM4861 Boomer audio power amplifiers.
- Low noise performance and high power supply rejection ratio (PSRR) with proper bypassing.
Applications
- Portable computers.
- Desktop computers.
- Low voltage audio systems.
- Other portable and low-power audio applications requiring high fidelity output.
Q & A
- What is the maximum output power of the LM4871MM/NOPB into a 3Ω load?
The LM4871MM/NOPB can deliver up to 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V supply. - What is the supply voltage range for the LM4871MM/NOPB?
The supply voltage range is from 2.0V to 5.5V. - How does the shutdown mode work on the LM4871MM/NOPB?
The shutdown mode is activated by applying a logic high to the shutdown pin, reducing the power consumption to 0.6µA. - What is the typical quiescent power supply current of the LM4871MM/NOPB?
The typical quiescent power supply current is 6.5 mA. - What is the power supply rejection ratio (PSRR) of the LM4871MM/NOPB?
The PSRR is 60 dB. - Does the LM4871MM/NOPB require output coupling capacitors or snubber circuits?
No, the LM4871MM/NOPB does not require output coupling capacitors, bootstrap capacitors, or snubber circuits. - What is the operating temperature range for the LM4871MM/NOPB?
The operating temperature range is from -40°C to 85°C. - What are the available package types for the LM4871MM/NOPB?
The LM4871MM/NOPB is available in WSON, VSSOP, SOIC, or PDIP packaging. - Is the LM4871MM/NOPB unity-gain stable?
Yes, the LM4871MM/NOPB is unity-gain stable. - What are some common applications for the LM4871MM/NOPB?
Common applications include portable computers, desktop computers, and low voltage audio systems.
