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LM49270

更新时间： 2024-02-03 01:18:18
品牌 Logo 应用领域
美国国家半导体 - NSC 放大器
页数 文件大小 规格书
24页 2568K
描述
Filterless 2.2W Stereo Class D Audio Subsystem with OCL Headphone Amplifier, 3D Enhancement, and Headphone Sense

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LM49270 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
零件包装代码：QFN包装说明：HVQCCN,
针数：28Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.33.00.01
风险等级：5.67商用集成电路类型：AUDIO AMPLIFIER
JESD-30 代码：S-XQCC-N28JESD-609代码：e0
长度：5 mm湿度敏感等级：1
信道数量：2功能数量：1
端子数量：28最高工作温度：85 °C
最低工作温度：-40 °C标称输出功率：2.2 W
封装主体材料：UNSPECIFIED封装代码：HVQCCN
封装形状：SQUARE封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
认证状态：Not Qualified座面最大高度：0.8 mm
最大供电电压 (Vsup)：5.5 V最小供电电压 (Vsup)：2.4 V
表面贴装：YES温度等级：INDUSTRIAL
端子面层：Tin/Lead (Sn85Pb15)端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
宽度：5 mm

LM49270 数据手册

 浏览型号LM49270的Datasheet PDF文件第2页浏览型号LM49270的Datasheet PDF文件第3页浏览型号LM49270的Datasheet PDF文件第4页浏览型号LM49270的Datasheet PDF文件第5页浏览型号LM49270的Datasheet PDF文件第6页浏览型号LM49270的Datasheet PDF文件第7页 
December 2006  
LM49270ꢀ  
Filterless 2.2W Stereo Class D Audio Subsystem with OCL  
Headphone Amplifier, 3D Enhancement, and Headphone  
Sense  
General Description  
Key Specifications  
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’s unique 3D sound enhancement into a single de-  
vice. The LM49270 uses flexible I2C control interface for  
multiple application requirements.  
■ꢀStereo Class D Amplifier Efficiency:  
ꢀVDD = 3.3V, 450mW/Ch into 8Ω  
ꢀVDD = 5V, 1W/Ch into 8Ω  
■ꢀQuiescent Power Supply Current, VDD = 3.3V  
ꢀSpeaker Mode  
ꢀHeadphone Mode (OCL)  
■ꢀPower Output/Channel, VDD = 5V  
ꢀClass D Speaker amplifier:  
RL = 4Ω, THD+N = ≤ 10%  
RL = 8Ω, THD+N = ≤ 1%  
84%  
84%  
5.5mA  
4mA  
The filterless stereo class D amplifiers delivers 2.2W/channel  
into a 4Ω load with less than 10% THD+N with a 5V supply.  
The headphone amplifier features National’s 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).  
2.2W  
1.06W  
ꢀHeadphone amplifier:  
155mW  
90mW  
0.02μA  
RL = 16Ω, THD+N = ≤ 1%  
RL = 32Ω, THD+N = ≤ 1%  
■ꢀShutdown current  
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 I2C compatible interface.  
Features  
Stereo filterless Class D amplifier  
■
■
■
■
■
■
■
■
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.  
Selectable OCL/CC headphone amplifier  
Headphone sense ability  
National’s 3D Enhancement  
RF suppression  
I2C 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  
Portable DVD players  
■
■
■
■
Smart phones  
PDAs  
Laptops  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2007 National Semiconductor Corporation  
202129  
www.national.com  
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