LM4953

更新时间： 2024-11-20 21:54:23

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器
页数	文件大小	规格书
11页	662K
描述
Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver

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LM4953 数据手册

September 2005

LM4953

Ground-Referenced, Ultra Low Noise, Ceramic Speaker

Driver

General Description

Key Specifications

The LM4953 is an audio power amplifier designed for driving

Ceramic Speaker in portable applications. When powered by

a 3.6V supply, it is capable of forcing 12.6Vpp across a 2µF

+ 30Ω bridge-tied-load (BTL) with less than 1% THD+N.

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4953 does not require boot-

strap capacitors, or snubber circuits. Therefore it is ideally

suited for display applications requiring high power and mini-

mal size.

Quiescent Power Supply Current (V_dd= 3V) 7mA(typ)

BTL Voltage Swing

(2µF+30Ω load, 1% THD+N,

V_dd= 3.6V)

12.6V_pp(typ)

1µA (max)

Shutdown Current

Features

n Pop & click circuitry eliminates noise during turn-on and

turn-off transitions

The LM4953 features a low-power consumption shutdown

mode. Additionally, the LM4953 features an internal thermal

shutdown protection mechanism.

n Low, 1µA (max) shutdown current

n Low, 7mA (typ) quiescent current

n 12.6Vpp mono BTL output, load = 2µF+ 30Ω

n Thermal shutdown

The LM4953 contains advanced pop & click circuitry that

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

n Unity-gain stable

The LM4953 is unity-gain stable and can be configured by

external gain-setting resistors.

n External gain configuration capability

Applications

n Cellphone

n PDA

Typical Application

20142168

FIGURE 1. Typical Application Circuit

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

DS201421

www.national.com

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