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LM4867
Output-Transient-Free Dual 2.1W Audio Amplifier Plus
No Coupling Capacitor Stereo Headphone Function
General Description
The LM4867 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.1W
toa4
load (Note 1) or 2.4W to a 3 load (Note 2) with less
than 1.0% THD+N. The LM4867 uses advanced, latest gen-
eration 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 be-
tween two different customer-specified closed-loop re-
sponses.
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.
Note 1: An LM4867LQ or LM4867MTE that has been properly mounted to
a circuit board will deliver 2.1W into 4
. The Mux control can also be used to
select two different closed-loop responses. LM4867MT will deliver 1.1W into
8
. See the Application Information sections for further information concern-
ing the LM4867LQ and the LM4867MT.
Note 2: An LM4867LQ or LM4867MTE that has been properly mounted to a
circuit board and forced-air cooled will deliver 2.4W into 3
.
Key Specifications
n
P
O at 1% THD+N
n
LM4867LQ, 3
load
2.4W (typ)
n
LM4867LQ, 4
load
2.1W (typ)
n
LM4867MTE, 4
1.9W (typ)
n
LM4867MT, 8
1.1W (typ)
n
Single-ended mode - THD+N at 75mW into 32
0.5%
(max)
n
Shutdown current
0.7A (typ)
Features
n
Advanced “click and pop” suppression circuitry
n
Eliminates headphone amplifier output coupling
capacitors (patent pending)
n
Stereo headphone amplifier mode
n
Input mux control and two separate inputs per channel
n
Thermal shutdown protection circuitry
n
LLP, TSSOP, and exposed-DAP TSSOP packaging
available
Applications
n
Multimedia monitors
n
Portable and desktop computers
n
Portable audio systems
Connection Diagrams
20001358
Top View
Order Number LM4867MT, LM4867MTE
See NS Package Number MTC20 for TSSOP
See NS Package Number MXA20A for Exposed-DAP TSSOP
Boomer is a registered trademark of National Semiconductor Corporation.
August 2002
LM4867
Output-T
ransient-Free
Dual
2.1W
Audio
Amplifier
Plus
No
Coupling
Capacitor
Stereo
Headphone
Function
2004 National Semiconductor Corporation
DS200013
www.national.com
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相关代理商/技术参数
LM4867MT 制造商:NSC 制造商全称:National Semiconductor 功能描述:Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function
LM4867MT NOPB 制造商:Texas Instruments 功能描述:Audio Amp Headphone/Speaker 2-CH Stereo 1.5W Class-AB 20-Pin TSSOP Rail
LM4867MT/NOPB 功能描述:IC AMP AUDIO PWR 3W AB 20TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR)
LM4867MTE 制造商:Texas Instruments 功能描述:Audio Amp Headphone/Speaker 2-CH Stereo 3W Class-AB 20-Pin TSSOP EP Rail
LM4867MTE/NOPB 功能描述:IC AMP AUDIO PWR 3W AB 20TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR)
LM4867MTEX 制造商:National Semiconductor Corporation 功能描述:Audio Amplifier Circuit, Dual, 20 Pin, Plastic, TSSOP
LM4867MTEX/NOPB 功能描述:IC AMP AUDIO PWR 3W AB 20TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR)
LM4867MTX/NOPB 功能描述:IC AMP AUDIO PWR 3W AB 20TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR)