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Features
National 3D Enhancement
Selectable headphone enable modes
Stereo headphone amplifier mode
Improved “click and pop” suppression circuitry
Thermal shutdown protection circuitry
PCB area-saving SQ package
Micro power shutdown mode
Description The
LM4888 is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.1W to a 4Ω load
or 2.4W to a 3Ω load
with less than 1.0% THD+N.
A user selectable “National 3D Enhancement” mode provides enhanced stereo imaging.
The LM4888SQ also has two separate HP (headphone) enable inputs, each having different logic level thresholds. Either HP
enable input activates the single ended headphone mode and disables the BTL output mode. The HP Sense input is for use with
a normal stereo headphone jack. The remaining input, HP Logic, accepts standard logic level thresholds.
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 LM4888SQ combines dual bridge speaker amplifiers
and stereo headphone amplifiers on one chip.
The LM4888SQ features a low-power consumption shutdown mode and thermal shutdown protection. It also utilizes circuitry to
reduce “clicks and pops” during device turn-on.
An LM4888SQ that has been properly mounted to a circuit board will deliver 2.1W into 4Ω. See the Application Information
sections for further information concerning the LM4888SQ.
An LM4888SQ that has been properly mounted to a circuit board and forced-air cooled will deliver 2.4W into 3Ω.
Key Specification
| ■ PO at 1% THD+N, VDD = 5V
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RL = 3Ω
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2.4W (typ)
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RL = 4Ω
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2.1W (typ)
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RL = 8Ω
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1.3W (typ)
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| ■
Single-ended mode THD+N
at 75mW into 32Ω (5V, 1kHz)
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0.01% (typ)
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| ■ Shutdown current
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0.04µA (typ)
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| ■ Supply voltage range
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2.7V to 5.5V
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| ■ PSRR at 217Hz
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85dB (typ)
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Applications
Cell phones
Multimedia monitors
Portable and desktop computers
Portable audio systems
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