Datasheet > LM4667MM

LM4667MM

更新时间： 2024-11-22 22:51:51

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
16页	754K
描述
Filterless High Efficiency 1.3W Switching Audio Amplifier

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LM4667MM 数据手册

September 2004

LM4667

Filterless High Efficiency 1.3W Switching Audio

Amplifier

General Description

Key Specifications

The LM4667 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

LM4667 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 74% (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

86% (typ)

3.5mA (typ)

0.01µA (typ)

2.7V to 5.5V

The LM4667 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 2.7V 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: 5ms (typ)

n Minimum external components

n "Click and pop" suppression circuitry

n Micro-power shutdown mode

n Short circuit protection

The LM4667 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 74%, reaching

84% at 450mW output power.

The LM4667 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 micro SMD and MSOP

packages

The LM4667 has fixed selectable gain of either 6dB or 12dB.

The LM4667 has short circuit protection against a short from

the outputs to V_DD, GND, or across the outputs.

Applications

n Mobile phones

n PDAs

n Portable electronic devices

Typical Application

200405G5

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS200405

www.national.com

12 3 4 5 6 7...16

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与LM4667MM相关器件

型号	品牌	获取价格	描述	数据表
LM4668	NSC	获取价格	10W High-Efficiency Mono BTL Audio Power Amplifier
LM4668LD	NSC	获取价格	10W High-Efficiency Mono BTL Audio Power Amplifier
LM4668LD/NOPB	TI	获取价格	10W, 1 CHANNEL, AUDIO AMPLIFIER, DSO14
LM4668LDX	NSC	获取价格	IC 10 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO14, Audio/Video Amplifier
LM4668LDX/NOPB	NSC	获取价格	IC 10 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO14, Audio/Video Amplifier
LM4668LDX/NOPB	TI	获取价格	10W, 1 CHANNEL, AUDIO AMPLIFIER, DSO14
LM4668MH	NSC	获取价格	10W High-Efficiency Mono BTL Audio Power Amplifier
LM4668MHX/NOPB	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,TSSOP,20PIN,PLASTIC
LM4670	NSC	获取价格	Filterless High Efficiency 3W Switching Audio Amplifier
LM4670	TI	获取价格	LM4670 Boomer Audio Power Amplifier Series Filterless High

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