Overview
The LM4808MX/NOPB, produced by Texas Instruments, is a dual audio power amplifier designed to deliver high-quality audio output with minimal external components. This amplifier is capable of providing 105 mW of continuous average power per channel into a 16Ω load with a total harmonic distortion plus noise (THD+N) of 0.1% from a 5V power supply. It is part of the Boomer audio power amplifier family, which is optimized for low-power portable systems.
Key Specifications
| Parameter | Conditions | Typical Value | Limit | Units |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.0 - 5.5 | V | ||
| Output Power at 0.1% THD+N into 16Ω | 1 kHz, VDD = 5V | 105 | mW | |
| Output Power at 0.1% THD+N into 32Ω | 1 kHz, VDD = 5V | 70 | mW | |
| THD+N at 1 kHz into 16Ω | 105 mW Continuous Average Output Power | 0.1% | % | |
| THD+N at 1 kHz into 32Ω | 70 mW Continuous Average Output Power | 0.1% | % | |
| Supply Current (IDD) | VIN = 0V, IO = 0A | 6 mA (max) | mA | |
| Input Offset Voltage (VOS) | VIN = 0V | 10 mV (typ) | 50 mV (max) | mV |
| Operating Temperature Range | -40°C to 85°C | °C |
Key Features
- Unity-gain stable, allowing configuration by external gain-setting resistors.
- Switch On/Off Click Suppression to minimize audible clicks during power-up and power-down.
- Excellent Power Supply Ripple Rejection for clean audio output.
- Minimum external components required, eliminating the need for bootstrap capacitors or snubber networks.
- Available in WSON, VSSOP, and SOIC surface mount packaging.
Applications
- Headphone Amplifier: Ideal for driving headphones in various audio systems.
- Personal Computers: Enhances audio quality in PC applications.
- Portable Electronic Devices: Suitable for low-power portable systems such as MP3 players, smartphones, and tablets.
Q & A
- What is the maximum output power of the LM4808 into a 16Ω load?
The LM4808 can deliver up to 105 mW of continuous average power into a 16Ω load with 0.1% THD+N.
- What is the typical THD+N at 1 kHz into a 32Ω load?
The typical THD+N at 1 kHz into a 32Ω load is 0.1% at 70 mW continuous average output power.
- What are the operating temperature ranges for the LM4808?
The operating temperature range is -40°C to 85°C.
- Does the LM4808 require external bootstrap capacitors or snubber networks?
No, the LM4808 does not require bootstrap capacitors or snubber networks.
- What are the available package types for the LM4808?
The LM4808 is available in WSON, VSSOP, and SOIC surface mount packaging.
- What is the supply voltage range for the LM4808?
The supply voltage range is 2.0V to 5.5V.
- How does the LM4808 handle power supply ripple?
The LM4808 has excellent power supply ripple rejection, ensuring clean audio output.
- Is the LM4808 suitable for portable electronic devices?
- What is the input offset voltage of the LM4808?
The typical input offset voltage is 10 mV, with a maximum of 50 mV.
- Does the LM4808 support click suppression during power-up and power-down?
