Datasheet > LM4888_06

LM4888_06

更新时间： 2022-04-23 23:00:11

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
23页	1176K
描述
Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D Enhancement

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LM4888_06 数据手册

March 2006

LM4888

Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D

Enhancement

General Description

Key Specifications

The LM4888 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.

P_Oat 1% THD+N, V_DD= 5V

R_L= 3Ω

2.4W (typ)

2.1W (typ)

1.3W (typ)

0.01% (typ)

R_L= 4Ω

A user selectable “National 3D Enhancement” mode pro-

vides enhanced stereo imaging.

R_L= 8Ω

Single-ended mode THD+N

at 75mW into 32Ω (5V, 1kHz)

Shutdown current

Supply voltage range

PSRR at 217Hz

The LM4888SQ also has two separate HP (headphone)

enable inputs, each having different logic level thresholds.

Either HP enable input activates the single ended head-

phone mode and disables the BTL output mode. The HP

Sense input is for use with a normal stereo headphone jack.

The remaining input, HP Logic, accepts standard logic level

thresholds.

0.04µA (typ)

2.7V to 5.5V

85dB (typ)

Features

Boomer audio power amplifiers were designed specifically to

provide high quality output power from a surface mount

package while requiring few external components. To sim-

plify audio system design, the LM4888SQ combines dual

bridge speaker amplifiers and stereo headphone amplifiers

on one chip.

n National 3D Enhancement

n Selectable headphone enable modes

n Stereo headphone amplifier mode

n Improved “click and pop” suppression circuitry

n Thermal shutdown protection circuitry

n PCB area-saving SQ package

The LM4888SQ features a low-power consumption shut-

down mode and thermal shutdown protection. It also utilizes

circuitry to reduce “clicks and pops” during device turn-on.

n Micro power shutdown mode

Note 1: An LM4888SQ that has been properly mounted to a circuit board

will deliver 2.1W into 4Ω. See the Application Information sections for further

information concerning the LM4888SQ.

Applications

n Cell phones

Note 2: An LM4888SQ that has been properly mounted to a circuit board

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

n Multimedia monitors

n Portable and desktop computers

n Portable audio systems

Connection Diagrams

LM4888SQ

LM4888SQ Top Mark

201116C6

Top View

U = Fab Code

Z = Assembly Plant Code

XY = Date Code

TT = Die Traceability

20111628

Top View

Order Number LM4888SQ

See NS Package Number SQA24A

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

DS201116

www.national.com

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