- RF suppression circuitry
- Fully differential amplification
- Space-saving micro SMD and LLP packages
- Ultra-low current shutdown mode
- Drives capacitive loads up to 100pF
- Improved pop-and-click circuitry eliminates turn-on noise and turn-off transitions
- 2.4 - 5.5V operation
- No output coupling capacitors, buffer networks, or bootstrap capacitors required
illustrate
The LM4928 is a stereo fully differential stereo audio power amplifier designed primarily for demanding applications in mobile phones and other portable communications equipment. It is capable of delivering 1.2 watts of continuous average power to 8  From 5Vdirect currentThe power supply load is less than 1% distortion (THD + N).
Boomer audio power amplifiers are designed to provide high quality output power with very few external components. The LM4928 does not require output coupling or starter capacitors, making it ideal for use in mobile phones and other low voltage applications where minimum power consumption is a major requirement.
The LM4928 has a low-power shutdown mode. To facilitate this work, shutdown enables logic low. In addition, the LM4928 has an internal thermal shutdown protection mechanism.
The LM4928 includes advanced POP and click-and-click noise cancellation circuitry that would otherwise occur when switching on and off.
Main specifications
| Improved PSRR at 217Hz |
90 dB (typical) |
|
Output power at 5.0V @ 1% THD+N (8 ）
|
1.2W (typical) |
|
Output power at 3.0V @ 1% THD+N (8 ）
|
400MW (typical) |
| Shutdown current |
0.1μA (typical) |
apply
- cell phone
- Pocket PC
- Portable electronic devices and accessories
|