Overview
The LM4890MM/NOPB is a 1 Watt audio power amplifier designed by Texas Instruments, specifically tailored for demanding applications in mobile phones and other portable communication devices. This amplifier is part of the Boomer series, known for providing high-quality output power with minimal external components. It operates within a voltage range of 2.2 to 5.5V and can deliver 1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5V DC power supply. The LM4890MM/NOPB is available in several space-saving packages, including VSSOP, DSBGA, SOIC, and WSON.
Key Specifications
| Specification | Value |
|---|---|
| Package | VSSOP (DGK) with 8 pins |
| Operating Temperature Range (°C) | -40 to 85 |
| PSRR at 217Hz, VDD = 5V | 62dB (typ.) |
| Power Output at 5.0V & 1% THD | 1W (typ.) |
| Power Output at 3.3V & 1% THD | 400mW (typ.) |
| Shutdown Current | 0.1μA (typ.) |
Key Features
- Available in space-saving packages: DSBGA, VSSOP, SOIC, and WSON
- Ultra low current shutdown mode
- BTL output can drive capacitive loads
- Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions
- 2.2 - 5.5V operation
- No output coupling capacitors, snubber networks, or bootstrap capacitors required
- Thermal shutdown protection
- Unity-gain stable
- External gain configuration capability
Applications
The LM4890MM/NOPB is primarily designed for demanding applications in mobile phones and other portable communication devices. Its low power consumption and minimal external component requirements make it ideal for low voltage applications where power efficiency is crucial.
Q & A
- What is the typical power output of the LM4890MM/NOPB at 5V and 1% THD?
1 watt
- What is the operating voltage range of the LM4890MM/NOPB?
2.2 to 5.5V
- Does the LM4890MM/NOPB require output coupling capacitors or bootstrap capacitors?
No, it does not require these components.
- What is the typical shutdown current of the LM4890MM/NOPB?
0.1μA
- What type of packages is the LM4890MM/NOPB available in?
DSBGA, VSSOP, SOIC, and WSON
- What is the purpose of the improved pop & click circuitry in the LM4890MM/NOPB?
To eliminate noises during turn-on and turn-off transitions.
- Is the LM4890MM/NOPB unity-gain stable?
Yes, it is unity-gain stable.
- Can the gain of the LM4890MM/NOPB be configured externally?
Yes, it can be configured by external gain-setting resistors.
- What is the typical PSRR at 217Hz and VDD = 5V for the LM4890MM/NOPB?
62dB
- What is the operating temperature range of the LM4890MM/NOPB?
-40 to 85°C
