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LM4925 PDF预览

LM4925

更新时间: 2024-10-27 21:54:19
品牌 Logo 应用领域
美国国家半导体 - NSC 音频放大器
页数 文件大小 规格书
15页 1043K
描述
2 Cell, Single Ended Output, 40mW Stereo Headphone Audio Amplifier

LM4925 数据手册

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February 2005  
LM4925  
2 Cell, Single Ended Output, 40mW Stereo Headphone  
Audio Amplifier  
General Description  
Key Specifications  
n Mono-BTL Output Power  
The unity gain stable LM4925 is both a mono differential  
output (for BTL operation) audio amplifier and a Single  
Ended (SE) stereo headphone amplifier. Operating on a  
single 3V supply, the mono-BTL mode delivers 410mW into  
an 8load at 1% THD+N. In Single Ended stereo head-  
phone mode, the amplifier delivers 40mW per channel into a  
16load at 1% THD+N.  
n
(RL = 8, VDD = 3.0V, THD+N = 1%)  
n Single Ended Output Power Per Channel  
(RL = 16, VDD = 3.0V, THD+N = 1%)  
410mW (typ)  
n
40mW (typ)  
0.1µA (typ)  
n Micropower shutdown current  
n Supply voltage operating range  
n PSRR 100Hz, VDD = 3V, BTL  
<
<
1.5V VDD 3.6V  
70dB (typ)  
With the LM4925 packaged in the MM and LLP packages,  
the customer benefits include low profile and small size. This  
package minimizes PCB area and maximizes output power.  
Features  
n BTL mode for mono speaker  
n 2-cell 1.5V to 3.6V battery operation  
The LM4925 features circuitry that reduces output transients  
(“clicks” and “pops”) during device turn-on and turn-off, an  
externally controlled, low-power consumption, active-low  
shutdown mode, and thermal shutdown. Boomer audio  
power amplifiers are designed specifically to use few exter-  
nal components and provide high quality output power in a  
surface mount package.  
n Single ended headphone operation with output coupling  
capacitors  
n Unity-gain stable  
n “Click and pop” suppression circuitry for both Shutdown  
and Mute  
n Active low micro-power shutdown  
n Active-low mute mode  
n Thermal shutdown protection circuitry  
Applications  
n Portable two-cell audio products  
n Portable two-cell electronic devices  
Typical Application  
20121157  
FIGURE 1. Block Diagram  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2005 National Semiconductor Corporation  
DS201211  
www.national.com  

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2 Cell, Single Ended Output, 40mW Stereo Headphone Audio Amplifier