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Features
Input mux control and two separate inputs per channel
Stereo headphone amplifier mode
Improved "click and pop" suppression circuitry
Thermal shutdown protection circuitry
PCB area-saving SQ package
Description The LM4883 is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.1W to a 4 load or 2.4W to a 3 load with less than 1.0% THD+N. In addition, the headphone input pin allows the amplifiers to operate in single-ended mode when driving stereo headphones. A MUX control pin allows selection between the two stereo sets of amplifier inputs. The MUX control can also be used to select two different closed-loop responses.
Boomer audio power amplifiers were designed specifically to provide high quality output power from a surface mount package while requiring few external components. To simplify audio system design, the LM4883SQ combines dual bridge speaker amplifiers and stereo headphone amplifiers on one chip.
The LM4883SQ features an internally controlled, low-power consumption shutdown mode, a stereo headphone amplifier mode, and thermal shutdown protection. It also utilizes circuitry to reduce "clicks and pops" during device turn-on.
Key Specification
| PO at 1% THD+N | |
| RL = 3 | 2.4W (typ) |
| RL = 4 | 2.1W (typ) |
| RL = 8 | 1.3W (typ) |
| Single-ended mode THD+N at 75mW into 32 (5V, 1kHz) | 0.01% (typ) |
| Shutdown current | 0.04µA (typ) |
| Supply voltage range | 2.4V to 5.5V |
| PSRR at 217Hz | 85dB (typ) |
Applications
Multimedia monitors
Portable and desktop computers
Portable audio systems
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