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LM49270SQ Datasheet

  • LM49270SQ

  • National Semiconductor [Filterless 2.2W Stereo Class D Audi...

  • NSC

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LM49270 Filterless 2.2W Stereo Class D Audio Subsystem with OCL Headphone Amplifier, 3D
Enhancement, and Headphone Sense
December 2006
LM49270
鈥?/div>
Filterless 2.2W Stereo Class D Audio Subsystem with OCL
Headphone Amplifier, 3D Enhancement, and Headphone
Sense
General Description
The LM49270 is a fully integrated audio subsystem designed
for stereo multimedia applications. The LM49270 combines a
2.2W stereo Class D amplifier with a 155mW stereo head-
phone amplifier, volume control, headphone sense, and
National鈥檚 unique 3D sound enhancement into a single de-
vice. The LM49270 uses flexible I
2
C control interface for
multiple application requirements.
The filterless stereo class D amplifiers delivers 2.2W/channel
into a 4鈩?load with less than 10% THD+N with a 5V supply.
The headphone amplifier features National鈥檚 Output Capaci-
tor-less (OCL) architecture that eliminates the output coupling
capacitors required by traditional headphone amplifiers.
The IC features a headphone sense input (HPS) that auto-
matically detects the presence of a headphone and config-
ures the device accordingly. The LM49270 can automatically
switch from OCL headphone output to a line driver output. If
the VOC pin is pulled to GND, the VOC amplifier is disabled
and the VOC pin is internally set to GND. This feature allows
the LM49270 to be used as a line driver in OCL mode without
a GND conflict on the headphone jack sleeve. Additionally,
the headphone amplifier can be configured as capacitively
coupled (CC).
The LM49270 features a 32 step volume control for the head-
phone and stereo outputs. The device mode select and vol-
ume are controlled through an I
2
C compatible interface.
Output short circuit and thermal shutdown protection prevent
the device from being damaged during fault conditions. Su-
perior click and pop suppression eliminates audible transients
on power-up/down and during shutdown. The LM49270 is
available in a space saving 28-pin, 5x5mm LLP package.
Key Specifications
鈻犫€?/div>
Stereo Class D Amplifier Efficiency:
鈥?/div>
V
DD
= 3.3V, 450mW/Ch into 8鈩?/div>
鈥?/div>
V
DD
= 5V, 1W/Ch into 8鈩?/div>
鈻犫€?/div>
Quiescent Power Supply Current, V
DD
= 3.3V
鈥?/div>
Speaker Mode
鈥?/div>
Headphone Mode (OCL)
鈻犫€?/div>
Power Output/Channel, V
DD
= 5V
鈥?/div>
Class D Speaker amplifier:
R
L
= 4鈩?
THD+N =
鈮?/div>
10%
R
L
= 8鈩?
THD+N =
鈮?/div>
1%
2.2W
1.06W
5.5mA
4mA
84%
84%
鈥?/div>
Headphone amplifier:
R
L
= 16鈩?
THD+N =
鈮?/div>
1%
R
L
= 32鈩?
THD+N =
鈮?/div>
1%
155mW
90mW
0.02渭A
鈻犫€?/div>
Shutdown current
Features
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Stereo filterless Class D amplifier
Selectable OCL/CC headphone amplifier
Headphone sense ability
National鈥檚 3D Enhancement
RF suppression
I
2
C control interface
32-step digital volume control
6 Operating Modes
Output short circuit protection and thermal shutdown
protection
Minimum external components
Click and Pop suppression
Micro-power shutdown
Independent speaker and headphone volume controls
Available in space-saving 28 pin LLP package
Applications
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Portable DVD players
Smart phones
PDAs
Laptops
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
202129
www.national.com

LM49270SQ 產(chǎn)品屬性

  • D

  • 4

  • 2.2W

  • 2.4V 到 5.5V

  • 4ohm

  • -40°C 到 +85°C

  • LLP

  • 28

  • No SVHC (19-Dec-2011)

  • 2.2W

  • 49270

  • LLP

  • -40°C

  • 85°C

  • 1

  • 耳機(jī)

  • 5.5V

  • 2.4V

  • 表面安裝

  • 4ohm

  • 10mV

  • 5.5V

LM49270SQ相關(guān)型號(hào)PDF文件下載

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