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Features
Advanced "click and pop" suppression circuitry
Eliminates headphone amplifier output coupling capacitors (patent pending)
Stereo headphone amplifier mode
Input mux control and two separate inputs per channel
Thermal shutdown protection circuitry
LLP, TSSOP, and exposed-DAP TSSOP packaging available
Description The LM4867 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. The LM4867 uses advanced, latest generation circuitry to eliminate all traces of clicks and pops when the supply voltage is first applied. The amplifier has a headphone-amplifier-select input pin. It is used to switch the amplifiers from bridge to single-ended mode for driving headphones. A new circuit topology eliminates headphone output coupling capacitors (patent pending). A MUX control pin allows selection between the two sets of stereo input signals. The MUX control can also be used to select between two different customer-specified closed-loop responses.
Boomer audio power amplifiers are designed specifically to provide high quality output power from a surface mount package and require few external components. To simplify audio system design, the LM4867 combines dual bridge speaker amplifiers and stereo headphone amplifiers in one package.
The LM4867 features an externally controlled power-saving micropower shutdown mode, a stereo headphone amplifier mode, and thermal shutdown protection.
Key Specification
PO at 1% THD+N |
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LM4867LQ, 3 load |
2.4W (typ) |
LM4867LQ, 4 load |
2.1W (typ) |
LM4867MTE, 4 |
1.9W (typ) |
LM4867MT, 8 |
1.1W (typ) |
Single-ended mode - THD+N at 75mW into 32 |
0.5% (max) |
Shutdown current |
0.7µA (typ) |
Applications
Multimedia monitors
Portable and desktop computers
Portable audio systems
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