LM4890MX

更新时间： 2024-02-27 16:18:05

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器功率放大器
页数	文件大小	规格书
31页	1202K
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LM4890MX 数据手册

May 2003

LM4890

1 Watt Audio Power Amplifier

General Description

Key Specifications

The LM4890 is an audio power amplifier primarily designed

for demanding applications in mobile phones and other por-

table communication device applications. It is capable of

delivering 1 watt of continuous average power to an 8Ω BTL

load with less than 1% distortion (THD+N) from a 5V_DC

power supply.

PSRR at 217Hz, V_DD= 5V (Fig. 1)

Power Output at 5.0V & 1% THD

Power Output at 3.3V & 1% THD

Shutdown Current

62dB(typ.)

1W(typ.)

400mW(typ.)

0.1µA(typ.)

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4890 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for mobile phone and other low voltage appli-

cations where minimal power consumption is a primary re-

quirement.

Features

n Available in space-saving packages: micro SMD, MSOP,

SOIC, and LLP

n Ultra low current shutdown mode

n BTL output can drive capacitive loads

n Improved pop & click circuitry eliminates noises during

turn-on and turn-off transitions

n 2.2 - 5.5V operation

n No output coupling capacitors, snubber networks or

bootstrap capacitors required

n Thermal shutdown protection

n Unity-gain stable

n External gain configuration capability

The LM4890 features a low-power consumption shutdown

mode, which is achieved by driving the shutdown pin with

logic low. Additionally, the LM4890 features an internal ther-

mal shutdown protection mechanism.

The LM4890 contains advanced pop & click circuitry which

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

The LM4890 is unity-gain stable and can be configured by

external gain-setting resistors.

Applications

n Mobile Phones

n PDAs

n Portable electronic devices

Connection Diagrams

8 Bump micro SMD

8 bump micro SMD Marking

20019270

Top View

X - Date Code

T - Die Traceability

G - Boomer Family

E - LM4890IBP

20019223

Top View

Order Number LM4890IBP, LM4890IBPX

See NS Package Number BPA08DDB

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

DS200192

www.national.com

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