Features
| • | Stereo speaker amplifier |
| • | Stereo headphone amplifier |
| • | Independent Left, Right, and Mono volume controls |
| • | National 3D enhancement |
| • | I2C compatible interface |
| • | Ultra low shutdown current |
| • | Click and Pop Suppression circuit |
| • | 10 distinct output modes |
| • | Thermal Shutdown Protection |
| • | Available in micro SMD and LLP packages |
Description The LM4859 is an integrated audio sub-system designed for stereo cell phone applications. Operating on a 3.3V supply, it combines a stereo speaker amplifier delivering 495mW per channel into an 8 load and a stereo headphone amplifier delivering 33mW per channel into a 32 load. It integrates the audio amplifiers, volume control, mixer, power management control, and National 3D enhancement all into a single package. In addition, the LM4859 routes and mixes the stereo and mono inputs into 10 distinct output modes. The LM4859 is controlled through an I2C compatible interface. Other features include an ultra-low current shutdown mode and thermal shutdown protection.
Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components.
The LM4859 is available in a 30-bump TL package and a 28-lead LLP package.
Key Specification
| POUT, Stereo Loudspeakers, 4, 5V, 1% THD+N (LM4859SP) | 1.6W (typ) |
| POUT, Stereo Loudspeakers, 8, 5V, 1% THD+N | 1.2W (typ) |
| POUT, Stereo Headphones, 32, 5V, 1% THD+N | 75mW (typ) |
| POUT, Stereo Loudspeakers, 8, 3.3V, 1% THD+N | 495mW (typ) |
| POUT, Stereo Headphones, 32, 3.3V, 1% THD+N | 33mW (typ) |
| Shutdown Current | 0.06µA (typ) |
Applications
| • | Cell Phones |
| • | PDAs |
| • | Portable Gaming Devices |
| • | Internet Appliances |
| • | Portable DVD/CD/AAC/MP3 players |
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