Datasheet > LM4675

LM4675

更新时间： 2024-11-17 11:11:47

品牌	Logo	应用领域
德州仪器 - TI		放大器
页数	文件大小	规格书
25页	1380K
描述
具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器

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LM4675 数据手册

LM4675, LM4675SDBD, LM4675TLBD

www.ti.com

SNAS353C –AUGUST 2006–REVISED MAY 2013

LM4675

Ultra-Low EMI, Filterless, 2.65W, Mono, Class D

Audio Power Amplifier with Spread Spectrum

Check for Samples: LM4675, LM4675SDBD, LM4675TLBD

FEATURES

DESCRIPTION

The LM4675 is a single supply, high efficiency,

•

Spread Spectrum Architecture Reduces EMI

Mono Class D Operation

2.65W, mono, Class D audio amplifier. A spread

spectrum, filterless PWM architecture reduces EMI

and eliminates the output filter, reducing external

component count, board area consumption, system

cost, and simplifying design.

No Output Filter Required for Inductive Loads

Externally Configurable Gain

Very Fast Turn On Time: 17μs (typ)

Minimum External Components

The LM4675 is designed to meet the demands of

mobile phones and other portable communication

devices. Operating on a single 5V supply, it is

capable of driving a 4Ω speaker load at a continuous

average output of 2.2W with less than 1% THD+N. Its

flexible power supply requirements allow operation

from 2.4V to 5.5V. The wide band spread spectrum

architecture of the LM4675 reduces EMI-radiated

emissions due to the modulator frequency.

"Click and Pop" Suppression Circuitry

Micro-Power Shutdown Mode

Available in Space-Saving 0.5mm Pitch

DSBGA and WSON Packages

APPLICATIONS

•

Mobile Phones

PDAs

The LM4675 has high efficiency with speaker loads

compared to a typical Class AB amplifier. With a 3.6V

supply driving an 8Ω speaker, the IC's efficiency for a

100mW power level is 80%, reaching 89% at 400mW

output power.

Portable Electronic Devices

KEY SPECIFICATIONS

The LM4675 features a low-power consumption

shutdown mode. Shutdown may be enabled by

driving the Shutdown pin to a logic low (GND).

•

Efficiency at 3.6V, 400mW into 8Ω Speaker:

89% (typ)

Efficiency at 3.6V, 100mW into 8Ω Speaker:

80% (typ)

The gain of the LM4675 is externally configurable

which allows independent gain control from multiple

sources by summing the signals. Output short circuit

and thermal overload protection prevent the device

from damage during fault conditions.

Efficiency at 5V, 1W into 8Ω Speaker: 89%

(typ)

•

Quiescent Current, 3.6V Supply: 2.2mA (typ)

Total Shutdown Power Supply Current: 0.01µA

(typ)

•

Single Supply Range: 2.4V to 5.5V

PSRR, f = 217Hz: 82dB

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...25

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与LM4675相关器件

型号	品牌	获取价格	描述	数据表
LM4675SD	NSC	获取价格	Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum
LM4675SD/NOPB	TI	获取价格	具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器 \| NGQ \|
LM4675SDBD	TI	获取价格	Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum
LM4675SDX	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,LLCC,8PIN,PLASTIC
LM4675SDX/NOPB	TI	获取价格	具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器 \| NGQ \|
LM4675TL	NSC	获取价格	Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum
LM4675TL/NOPB	TI	获取价格	具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器 \| YZR \|
LM4675TLBD	TI	获取价格	Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum
LM4675TLX	NSC	获取价格	暂无描述
LM4675TLX/NOPB	TI	获取价格	具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器 \| YZR \|

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