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LM4888 Datasheet

  • LM4888

  • Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D Enhance...

  • 22頁(yè)

  • NSC

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LM4888 Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D Enhancement
June 2005
LM4888
Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D
Enhancement
General Description
The LM4888 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.1W
to a 4鈩?load (Note 1) or 2.4W to a 3鈩?load (Note 2) with less
than 1.0% THD+N.
A user selectable 鈥淣ational 3D Enhancement鈥?mode pro-
vides 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 head-
phone 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 sim-
plify audio system design, the LM4888SQ combines dual
bridge speaker amplifiers and stereo headphone amplifiers
on one chip.
The LM4888SQ features a low-power consumption shut-
down mode and thermal shutdown protection. It also utilizes
circuitry to reduce 鈥渃licks and pops鈥?during device turn-on.
Note 1:
An LM4888SQ that has been properly mounted to a circuit board
will deliver 2.1W into 4鈩? See the Application Information sections for further
information concerning the LM4888SQ.
Note 2:
An LM4888SQ that has been properly mounted to a circuit board
and forced-air cooled will deliver 2.4W into 3鈩?
Key Specifications
j
P
O
at 1% THD+N, V
DD
= 5V
R
L
= 3鈩?/div>
R
L
= 4鈩?/div>
R
L
= 8鈩?/div>
j
Single-ended mode THD+N
2.4W (typ)
2.1W (typ)
1.3W (typ)
0.01% (typ)
0.04碌A(chǔ) (typ)
2.7V to 5.5V
85dB (typ)
at 75mW into 32鈩?(5V, 1kHz)
j
Shutdown current
j
Supply voltage range
j
PSRR at 217Hz
Features
n
n
n
n
n
n
n
National 3D Enhancement
Selectable headphone enable modes
Stereo headphone amplifier mode
Improved 鈥渃lick and pop鈥?suppression circuitry
Thermal shutdown protection circuitry
PCB area-saving SQ package
Micro power shutdown mode
Applications
n
n
n
n
Cell phones
Multimedia monitors
Portable and desktop computers
Portable audio systems
Connection Diagrams
LM4888SQ
LM4888SQ Top Mark
201116C6
Top View
U = Fab Code
Z = Assembly Plant Code
XY = Date Code
TT = Die Traceability
20111602
Top View
Order Number LM4888SQ
See NS Package Number SQA24A
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201116
www.national.com

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