Datasheet > LM4868LQ

LM4868LQ

更新时间： 2024-11-08 22:51:39

品牌	Logo	应用领域
美国国家半导体 - NSC		商用集成电路电容器音频放大器
页数	文件大小	规格书
28页	786K
描述
Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function

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LM4868LQ 数据手册

August 2002

LM4868

Output-Transient-Free Dual 2.1W Audio Amplifier Plus

No Coupling Capacitor Stereo Headphone Function

General Description

Key Specifications

n P_Oat 1% THD+N

The LM4868 is a dual bridge-connected audio power ampli-

fier which, when connected to a 5V supply, will deliver 2.1W

to a 4Ω load (Note 1) or 2.4W to a 3Ω load (Note 2) with less

than 1.0% THD+N. The LM4868 uses advanced, latest gen-

eration circuitry to eliminate all traces of clicks and pops

when the supply voltage is first applied. The amplifier has a

headphone-amplifier-select input pin. It is used to switch the

amplifiers from bridge to single-ended mode for driving

headphones. A new circuit topology eliminates headphone

output coupling capacitors (patent pending). A MUX control

pin allows selection between the two sets of stereo input

signals. The MUX control can also be used to select be-

tween two different customer-specified closed-loop re-

sponses.

LM4868LQ, 3Ω load

LM4868LQ, 4Ω load

LM4868MTE, 4Ω

LM4868MT, 8Ω

2.4W (typ)

2.1W (typ)

1.9W (typ)

1.1W (typ)

n Single-ended mode - THD+N at 75mW into 32Ω

(max)

n Shutdown current

0.5%

0.7µA (typ)

Features

n Advanced “click and pop” suppression circuitry

n Eliminates headphone amplifier output coupling

capacitors (patent pending)

Boomer audio power amplifiers are designed specifically to

provide high quality output power from a surface mount

package and require few external components. To simplify

audio system design, the LM4868 combines dual bridge

speaker amplifiers and stereo headphone amplifiers in one

package.

n Stereo headphone amplifier mode

n Input mux control and two separate inputs per channel

n Thermal shutdown protection circuitry

n LLP, TSSOP, and exposed-DAP TSSOP packaging

available

The LM4868 features an externally controlled power-saving

micropower shutdown mode, a stereo headphone amplifier

mode, and thermal shutdown protection.

Note 1: An LM4868LQ or LM4868MTE that has been properly mounted to

a circuit board will deliver 2.1W into 4Ω. The Mux control can also be used to

select two different closed-loop responses. LM4868MT will deliver 1.1W into

8Ω. See the Application Information sections for further information concern-

ing the LM4868LQ and the LM4868MT.

Applications

n Multimedia monitors

n Portable and desktop computers

n Portable audio systems

Note 2: An LM4868LQ or LM4868MTE that has been properly mounted to a

circuit board and forced-air cooled will deliver 2.4W into 3Ω.

Connection Diagrams

20026758

Top View

Order Number LM4868MT, LM4868MTE

See NS Package Number MTC20 for TSSOP

See NS Package Number MXA20A for Exposed-DAP TSSOP

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

DS200267

www.national.com

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与LM4868LQ相关器件

型号	品牌	获取价格	描述	数据表
LM4868LQ/NOPB	TI	获取价格	3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24
LM4868LQX	TI	获取价格	3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24
LM4868LQX/NOPB	TI	获取价格	3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24
LM4868MT	NSC	获取价格	Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphon
LM4868MTE	NSC	获取价格	Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphon
LM4868MTE/NOPB	TI	获取价格	IC 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20, 6.50 X 4.40 MM, 0.90 MM HEIGHT, EXPOSED PAD, P
LM4868MTEX	TI	获取价格	3W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20, 6.50 X 4.40 MM, 0.90 MM HEIGHT, EXPOSED PAD, PLAST
LM4868MTEX/NOPB	TI	获取价格	3W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20, 6.50 X 4.40 MM, 0.90 MM HEIGHT, EXPOSED PAD, PLAST
LM4868MTX	TI	获取价格	1.5W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20, 4.40 MM, PLASTIC, TSSOP-20
LM4868MTX/NOPB	TI	获取价格	1.5W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20, 4.40 MM, PLASTIC, TSSOP-20

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