Datasheet > LM4868MT

LM4868MT

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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LM4868MT 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LM4868MT相关器件

型号	品牌	获取价格	描述	数据表
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
LM4869	NSC	获取价格	1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdo
LM4869MH	NSC	获取价格	1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdo
LM4869MHX/NOPB	TI	获取价格	2.6W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20, EXPOSED PAD, TSSOP-20
LM4870	NSC	获取价格	1.1W Audio Power Amplifier with Shutdown Mode

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