LM4665

更新时间： 2024-11-22 21:55:43

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
18页	1014K
描述
Filterless High Efficiency 1W Switching Audio Amplifier

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LM4665 数据手册

December 2002

LM4665

Filterless High Efficiency 1W Switching Audio Amplifier

General Description

Key Specifications

The LM4665 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

LM4665 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 100mW into 8Ω transducer

75%(typ)

80%(typ)

3mA(typ)

Efficiency at 400mW into 8Ω transducer

Total quiescent power supply current (3V)

Total shutdown power supply current (3V) 0.01µA(typ)

Single supply range (MSOP & LD)

Single supply range (ITL) (Note 11)

2.7V to 5.5V

2.7V to 3.8V

The LM4665 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 400mW with

less than 2%THD+N.

Features

n No output filter required for inductive transducers

n Selectable gain of 6dB (2V/V) or 12dB (4V/V)

n Very fast turn on time: 5ms (typ)

n User selectable shutdown High or Low logic level

n Minimum external components

The LM4665 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 75%, reaching

80% at 400mW output power.

n "Click and pop" suppression circuitry

n Micro-power shutdown mode

n Short circuit protection

n micro SMD, LLP, and MSOP packages (no heat sink

required)

The LM4665 features a low-power consumption shutdown

mode. Shutdown may be enabled by either a logic high or

low depending on the mode selection. Connecting the Shut-

down Mode pin to either V_DD(high) or GND (low) enables

the Shutdown pin to be driven in a likewise manner to

activate shutdown.

Applications

n Mobile phones

n PDAs

The LM4665 has fixed selectable gain of either 6dB or 12dB.

The LM4665 has short circuit protection against a short from

the outputs to V_DD, GND or across the outputs.

n Portable electronic devices

Typical Application

20027001

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS200270

www.national.com

12 3 4 5 6 7...18

中文翻译

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与LM4665相关器件

型号	品牌	获取价格	描述	数据表
LM4665ITL	NSC	获取价格	Filterless High Efficiency 1W Switching Audio Amplifier
LM4665ITL	ROCHESTER	获取价格	NATIONALâS AUDIO AMPLIFIER now featuring Ro
LM4665ITL/NOPB	TI	获取价格	具有可选增益的 1.4W 单声道、模拟输入 D 类音频放大器 \| YZR \| 9 \| -4
LM4665ITLX	ROCHESTER	获取价格	NATIONALâS AUDIO AMPLIFIER now featuring Ro
LM4665ITLX	NSC	获取价格	Filterless High Efficiency 1W Switching Audio Amplifier
LM4665ITLX/NOPB	NSC	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,9PIN,PLASTIC
LM4665ITLX/NOPB	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,9PIN,PLASTIC
LM4665LD	NSC	获取价格	Filterless High Efficiency 1W Switching Audio Amplifier
LM4665LD	ROCHESTER	获取价格	NATIONALâS AUDIO AMPLIFIER now featuring Ro
LM4665LD/NOPB	TI	获取价格	1W, 1 CHANNEL, AUDIO AMPLIFIER, DSO10, LLP-10

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