Overview
The LM4880MX/NOPB is a dual audio power amplifier produced by Texas Instruments. It is designed to deliver high-quality audio output with minimal external components, making it ideal for low-power portable systems. The amplifier is unity-gain stable and can be configured using external gain-setting resistors. It features a low-power consumption shutdown mode and internal thermal shutdown protection, enhancing its suitability for battery-powered devices and power-conscious designs.
Key Specifications
| Parameter | Conditions | Typical | Limit |
|---|---|---|---|
| Supply Voltage | 2.7V to 5.5V | - | 2.7V (min), 5.5V (max) |
| THD+N at 1kHz at 200mW Continuous Average Output Power into 8Ω | - | 0.1% (max) | - |
| THD+N at 1kHz at 85mW Continuous Average Output Power into 32Ω | - | 0.1% (typ) | - |
| Output Power at 10% THD+N at 1kHz into 8Ω | - | 325 mW (typ) | - |
| Shutdown Current | VPIN5=VDD | 0.7 µA (typ) | 5 µA (max) |
| Output Offset Voltage | VIN=0V | - | 5 mV (max), 50 mV (max) |
| Power Supply Rejection Ratio (PSRR) | CB = 1.0 μF, VRIPPLE=200 mVrms, f = 100 Hz | 50 dB | - |
Key Features
- No bootstrap capacitors or snubber circuits are necessary.
- Small Outline (SOIC) and PDIP packaging.
- Unity-gain stable.
- External gain configuration capability.
- Low-power consumption shutdown mode.
- Internal thermal shutdown protection.
- High power supply rejection ratio (PSRR).
Applications
- Headphone amplifier.
- Personal computers.
- CD-ROM players.
- Portable electronic devices.
- Power-conscious designs such as 'Green PC's'.
Q & A
- What is the typical output power of the LM4880 into an 8Ω load? The LM4880 can deliver typically 250 mW per channel of continuous average power into an 8Ω load.
- What is the THD+N at 1kHz for 200mW output into 8Ω? The THD+N at 1kHz for 200mW output into 8Ω is 0.1% (max).
- What is the shutdown current of the LM4880? The shutdown current is typically 0.7 µA.
- What is the supply voltage range for the LM4880? The supply voltage range is from 2.7V to 5.5V.
- Does the LM4880 require bootstrap capacitors or snubber networks? No, the LM4880 does not require bootstrap capacitors or snubber networks.
- What is the power supply rejection ratio (PSRR) of the LM4880? The PSRR is 50 dB with a 1.0 μF bypass capacitor and 200 mVrms ripple voltage at 100 Hz.
- What are the typical applications of the LM4880? Typical applications include headphone amplifiers, personal computers, CD-ROM players, and portable electronic devices.
- How does the LM4880 handle thermal protection? The LM4880 features internal thermal shutdown protection to prevent overheating.
- Can the LM4880 be used in high-gain configurations? Yes, the LM4880 can be used in high-gain configurations, but it is recommended to use it in low-gain configurations to minimize THD+N and maximize the signal-to-noise ratio.
- How important is proper supply bypassing for the LM4880? Proper supply bypassing is critical for low noise performance and high power supply rejection ratio (PSRR).
