Datasheet > LM4666SDA

LM4666SDA

更新时间： 2024-11-08 22:21:15

品牌	Logo	应用领域
美国国家半导体 - NSC		开关音频放大器
页数	文件大小	规格书
15页	639K
描述
Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier

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LM4666SDA 数据手册

May 2004

LM4666

Filterless High Efficiency Stereo 1.2W Switching Audio

Amplifier

General Description

Key Specifications

The LM4666 is a fully integrated single-supply high efficiency

switching audio amplifier. It features an innovative modulator

that eliminates the LC output filter used with typical switching

amplifiers. Eliminating the output filter reduces parts count,

simplifies circuit design, and reduces board area. The

LM4666 processes analog inputs with a delta-sigma modu-

lation technique that lowers output noise and THD when

compared to conventional pulse width modulators.

Efficiency at 3V, 100mW into 8Ω transducer 79% (typ)

Efficiency at 3V, 450mW into 8Ω transducer 84% (typ)

Efficiency at 5V, 1W into 8Ω transducer

Total quiescent power supply current

Total shutdown power supply current

Single supply range

85% (typ)

7.0mA (typ)

0.02µA (typ)

2.8V to 5.5V

The LM4666 is designed to meet the demands of mobile

phones and other portable communication devices. Operat-

ing on a single 3V supply, it is capable of driving 8Ω trans-

ducer loads at a continuous average output of 450mW with

less than 1%THD+N. Its flexible power supply requirements

allow operation from 2.8V to 5.5V.

Features

n No output filter required for inductive transducers

n Selectable gain of 6dB or 12dB

n Very fast turn on time: 6ms (typ)

n Minimum external components

n "Click and pop" suppression circuitry

n Micro-power shutdown mode

The LM4666 has high efficiency with an 8Ω transducer load

compared to a typical Class AB amplifier. With a 3V supply,

the IC’s efficiency for a 100mW power level is 79%, reaching

84% at 450mW output power.

n Short circuit protection

The LM4666 features a low-power consumption shutdown

mode. Shutdown may be enabled by driving the Shutdown

pin to a logic low (GND).

n Available in space-saving SDA package

Applications

n Mobile phones

n PDAs

The LM4666 has fixed selectable gain of either 6dB or 12dB.

The LM4666 has short circuit protection against a short from

the outputs to V_DDor GND.

n Portable electronic devices

Typical Application

200558E6

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS200558

www.national.com

12 3 4 5 6 7...15

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与LM4666SDA相关器件

型号	品牌	获取价格	描述	数据表
LM4666SDBD	TI	获取价格	Filterless High Efficiency Stereo 1.2W Switching
LM4666SDX	NSC	获取价格	IC 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, DSO14, LLP-14, Audio/Video Amplifier
LM4666SDX/NOPB	TI	获取价格	AUDIO AMPLIFIER
LM4667	NSC	获取价格	Filterless High Efficiency 1.3W Switching Audio Amplifier
LM4667	TI	获取价格	无线设备的音频解决方案
LM4667ITL	NSC	获取价格	Filterless High Efficiency 1.3W Switching Audio Amplifier
LM4667ITL/NOPB	TI	获取价格	Filterless High Efficiency 1.3W Switching Audio Amplifier 9-DSBGA -40 to 85
LM4667ITLX	NSC	获取价格	Filterless High Efficiency 1.3W Switching Audio Amplifier
LM4667ITLX/NOPB	TI	获取价格	暂无描述
LM4667MM	NSC	获取价格	Filterless High Efficiency 1.3W Switching Audio Amplifier

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