LM4980SD Datasheet

IC型号：
LM4980SD
PDF描述：
National Semiconductor [2 Cell Battery, 1mA, 42mW Per Chann...
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1320.02KB
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NSC

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LM4980 2 Cell Battery, 1mA, 42mW Per Channel High Fidelity Stereo Headphone Audio Amplifier

for MP3 players

July 2005

LM4980

2 Cell Battery, 1mA, 42mW Per Channel High Fidelity

Stereo Headphone Audio Amplifier for MP3 players

General Description

The LM4980 is a stereo headphone audio amplifier, which

when connected to a 3.0V supply, delivers 42mW to a 16鈩?/div>

load with less than 1% THD+N. With the LM4980 packaged

in the SD package, the customer benefits include low profile

and small size. This package minimizes PCB area and maxi-

mizes output power.

The LM4980 features circuitry that significantly reduces out-

put transients (鈥渃licks鈥?and 鈥減ops鈥? while driving headphones

during device turn-on and turn-off without costly external

additional circuitry. The LM4980 also includes an externally

controlled low-power consumption active-low shutdown

mode, and thermal shutdown. Boomer audio power amplifi-

ers are designed specifically to use few external compo-

nents and provide high quality output power in a surface

mount package.

Key Specifications

Output power

(RL = 16鈩? V

= 3.0V, THD+N = 1%)

Quiescent current (V

= 3V)

Micropower shutdown current

Supply voltage operating range

PSRR

1kHz, V

= 3.0V

PSRR

217Hz, V

= 3.0V

42mW (typ)

1mA (typ)

0.1碌A (typ)

1.5V

3.3V

90dB (typ)

100dB (typ)

Features

2-cell 1.5V to 3.3V battery operation

Unity-gain stable

鈥淐lick and pop鈥?suppression circuitry for shutdown and

power on/off transient with headphone loads

Active low micro-power shutdown

Thermal shutdown protection circuitry

Applications

Portable two-cell audio products

Portable two-cell electronic devices

Portable MP3 player/recorders

Typical Application

20142901

FIGURE 1. Block Diagram

Boomer

庐

is a registered trademark of National Semiconductor Corporation.

漏 2005 National Semiconductor Corporation

DS201429

www.national.com

制造商
National Semiconductor (TI)
产品
Class-AB
输出功率
0.042 W x 2 at 16 Ohms
输出类型
2-Channel Stereo
共模抑制比（最小值）
47 dB (Typ)
THD + 噪声
0.02 %
工作电源电压
3 V
最大工作温度
+ 85 C
封装 / 箱体
LLP EP
封装
Reel
音频负载电阻
32 Ohms
输入信号类型
Single
最小工作温度
- 40 C
输出信号类型
Single
电源类型
Single
Supply Voltage - Max
3.3 V
Supply Voltage - Min
1.5 V

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