Overview
The LM4808MMX/NOPB is a dual audio power amplifier designed by Texas Instruments. This device is capable of delivering 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 series, which is optimized for high-quality output power with minimal external components. The LM4808 is particularly suited for low-power portable systems due to its low voltage operation and high power supply ripple rejection.
Key Specifications
| Parameter | Conditions | Typical Value | Limit |
|---|---|---|---|
| Supply Voltage | 2.0V to 5.5V | - | 2.0V (min), 5.5V (max) |
| Supply Current | VIN = 0V, IO = 0A | 1.2 mA | 3.0 mA (max) |
| Output Power at 0.1% THD+N | RL = 16Ω, f = 1 kHz | 105 mW | - |
| Output Power at 0.1% THD+N | RL = 32Ω, f = 1 kHz | 70 mW | - |
| Input Offset Voltage | VIN = 0V | 10 mV | 50 mV (max) |
| Max Output Current | THD+N < 0.1% | 70 mA | - |
| Output Resistance | RL = 32Ω, 0.1% THD+N | 0.1 Ω | - |
| Operating Temperature Range | - | -40°C to 85°C | - |
Key Features
- Unity-gain stable
- Switch On/Off Click Suppression
- Excellent Power Supply Ripple Rejection
- Minimum External Components required
- Surface Mount Packaging (WSON, VSSOP, SOIC)
- High-quality output power with minimal external components
Applications
- Headphone Amplifier
- Personal Computers
- Portable Electronic Devices
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 supply current of the LM4808? The typical supply current is 1.2 mA when VIN = 0V and IO = 0A.
- What is the operating temperature range of the LM4808? The operating temperature range is from -40°C to 85°C.
- Does the LM4808 require bootstrap capacitors or snubber networks? No, the LM4808 does not require bootstrap capacitors or snubber networks.
- What types of packaging are available for the LM4808? The LM4808 is available in WSON, VSSOP, and SOIC surface mount packaging.
- How is the gain of the LM4808 set? The gain of the LM4808 is set using external gain-setting resistors (Ri and Rf).
- What is the maximum power dissipation of the LM4808? The maximum power dissipation is 80 mW for the entire package (40 mW per amplifier).
- What is the purpose of the exposed-dap (die attach paddle) package? The exposed-dap package provides a low thermal resistance between the die and the PCB, allowing for efficient heat transfer.
- What are some key applications of the LM4808? Key applications include headphone amplifiers, personal computers, and portable electronic devices.
- How does the LM4808 handle power supply ripple rejection? The LM4808 has excellent power supply ripple rejection, ensuring high-quality audio output.
