LM4888 NSC [National Semiconductor], LM4888 Datasheet

LM4888

Manufacturer Part Number

LM4888

Description

Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D Enhancement

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LM4888.pdf (22 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM4888SQ

Manufacturer:

NS/国半

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM4888SQ/NOPB

Manufacturer:

NS/国半

Quantity:

20 000

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Download datasheet (2Mb)

LM4888

Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D

Enhancement

General Description

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.

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

vides enhanced stereo imaging.

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.

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.

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.

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.

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

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

Connection Diagrams

Boomer

is a registered trademark of National Semiconductor Corporation.

See NS Package Number SQA24A

Order Number LM4888SQ

LM4888SQ

Top View

20111602

DS201116

Key Specifications

Features

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

n Micro power shutdown mode

Applications

n Cell phones

n Multimedia monitors

n Portable and desktop computers

n Portable audio systems

at 75mW into 32Ω (5V, 1kHz)

Shutdown current

Supply voltage range

PSRR at 217Hz

Single-ended mode THD+N

at 1% THD+N, V

= 3Ω

= 4Ω

= 8Ω

Z = Assembly Plant Code

LM4888SQ Top Mark

TT = Die Traceability

XY = Date Code

U = Fab Code

Top View

= 5V

201116C6

2.7V to 5.5V

0.04µA (typ)

www.national.com

0.01% (typ)

2.4W (typ)

2.1W (typ)

1.3W (typ)

85dB (typ)

June 2005

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