Overview
The LM4990MMX/NOPB is a 2-watt mono, analog input Class-AB audio amplifier manufactured by Texas Instruments. This amplifier is primarily designed for demanding applications in mobile phones and other portable communication devices. It is capable of delivering 1.25 watts of continuous average power to an 8Ω BTL load and 2 watts of continuous average power to a 4Ω BTL load with less than 1% distortion (THD+N) from a 5V DC power supply. The LM4990 is part of the Boomer audio power amplifier series, known for providing high-quality output power with minimal external components.
Key Specifications
| Specification | Value |
|---|---|
| Package | VSSOP (DGK) with 8 pins |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage Range | 2.2V to 5.5V |
| Power Output at 5.0V, 1% THD+N, 4Ω | 2W (Typ) |
| Power Output at 5.0V, 1% THD+N, 8Ω | 1.25W (Typ) |
| Power Output at 3.0V, 1% THD+N, 4Ω | 600mW (Typ) |
| Power Output at 3.0V, 1% THD+N, 8Ω | 425mW (Typ) |
| Shutdown Current | 0.1µA (Typ) |
| PSRR at 217Hz & 1KHz | 62dB |
Key Features
- Available in space-saving packages: WSON, Exposed-DAP MSOP-PowerPAD, VSSOP, and DSBGA
- Ultra-low current shutdown mode
- Improved click and pop circuitry eliminates noise during turn-on and turn-off transitions
- No output coupling capacitors, snubber networks, or bootstrap capacitors required
- Unity-gain stable
- External gain configuration capability
- User-selectable shutdown high or low logic level
Applications
The LM4990MMX/NOPB is ideally suited for mobile phones and other portable communication devices where minimal power consumption and high-quality audio output are critical. It is also applicable in various low-voltage audio applications requiring compact and efficient audio amplification.
Q & A
- What is the typical power output of the LM4990MMX/NOPB at 5V with a 4Ω load?
The typical power output is 2 watts with less than 1% THD+N. - What is the operating temperature range of the LM4990MMX/NOPB?
The operating temperature range is -40°C to 85°C. - Does the LM4990MMX/NOPB require output coupling capacitors or bootstrap capacitors?
No, it does not require these capacitors. - What is the shutdown current of the LM4990MMX/NOPB?
The shutdown current is typically 0.1µA. - Can the LM4990MMX/NOPB be configured for external gain?
Yes, it is unity-gain stable and can be configured by external gain-setting resistors. - What is the PSRR of the LM4990MMX/NOPB at 217Hz and 1KHz?
The PSRR is 62dB. - What are the available packages for the LM4990MMX/NOPB?
The available packages include WSON, Exposed-DAP MSOP-PowerPAD, VSSOP, and DSBGA. - How does the LM4990MMX/NOPB handle turn-on and turn-off transitions?
It features improved click and pop circuitry that eliminates noise during these transitions. - Can the shutdown logic level be selected on the LM4990MMX/NOPB?
Yes, the shutdown can be enabled by either logic high or low depending on the mode selection. - What is the supply voltage range for the LM4990MMX/NOPB?
The supply voltage range is 2.2V to 5.5V.
