Overview
The LM4990MM/NOPB is a 2-watt audio power amplifier designed by Texas Instruments, primarily for demanding applications in mobile phones, PDAs, and other portable electronic 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 2.2V to 5.5V, making it suitable for low-voltage applications where power consumption is a critical factor.
Key Specifications
| Parameter | Conditions | Typical Value | Limit |
|---|---|---|---|
| Power Output at 5.0V, 1% THD+N, 4Ω | NGZ and DGQ only | 2W | - |
| Power Output at 5.0V, 1% THD+N, 8Ω | - | 1.25W | - |
| Power Output at 3.0V, 1% THD+N, 4Ω | - | 600mW | - |
| Power Output at 3.0V, 1% THD+N, 8Ω | - | 425mW | - |
| Shutdown Current | VSD = VSD Mode | 0.1µA | 2.0µA |
| Supply Voltage Range | - | 2.2V to 5.5V | - |
| Operating Temperature Range | - | -40°C to 85°C | - |
| 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 with a typical shutdown current of 0.1µA.
- 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 with external gain configuration capability.
- User-selectable shutdown high or low logic level.
- High power supply rejection ratio (PSRR) at 217Hz and 1KHz.
Applications
- Mobile phones
- PDAs
- Portable electronic devices
Q & A
- What is the typical power output of the LM4990 at 5V with a 4Ω load?
The typical power output is 2 watts with less than 1% THD+N.
- What is the shutdown current of the LM4990?
The shutdown current is typically 0.1µA.
- What is the operating voltage range of the LM4990?
The operating voltage range is from 2.2V to 5.5V.
- Does the LM4990 require output coupling capacitors or bootstrap capacitors?
No, the LM4990 does not require output coupling capacitors, snubber networks, or bootstrap capacitors.
- What is the typical PSRR of the LM4990 at 217Hz and 1KHz?
The typical PSRR is 62dB.
- What are the available package types for the LM4990?
The LM4990 is available in WSON, Exposed-DAP MSOP-PowerPAD, VSSOP, and DSBGA packages).
- How does the LM4990 handle click and pop noise during transitions?
The LM4990 features improved click and pop circuitry that eliminates noise during turn-on and turn-off transitions).
- Can the gain of the LM4990 be externally configured?
Yes, the gain of the LM4990 can be externally configured using resistors).
- What is the operating temperature range of the LM4990?
The operating temperature range is from -40°C to 85°C).
- Is the LM4990 unity-gain stable?
Yes, the LM4990 is unity-gain stable).
