LM4954 Datasheet

IC型号：
LM4954
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National Semiconductor [HIgh Voltage 3 Watt Audio Power Amp...
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LM4954 High Voltage 3 Watt Audio Power Amplifier

June 2005

LM4954

High Voltage 3 Watt Audio Power Amplifier

General Description

The LM4954 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 2.4 Watts of continuous average power to an 8鈩?/div>

BTL load with less than 1% THD+N from a 7V

power

supply.

Boomer audio power amplifiers are designed specifically to

provide high quality output power with a minimal number of

external components. The LM4954 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for lower-power portable applications where

minimal space and power consumption are primary require-

ments.

The LM4954 features a low-power consumption global shut-

down mode which is achieved by driving the shutdown pin

with logic low. Additionally, the LM4954 features an internal

thermal shutdown protection mechanism.

The LM4954 contains advanced pop & click circuitry which

eliminates noises that would otherwise occur during turn-on

and turn-off transitions.

The LM4954 is unity-gain stable and can be configured by

external gain-setting resistors.

Key Specifications

Wide Power Supply

Voltage Range

Output Power: V

= 7V, 1% THD+N

Quiescent power supply current

PSRR: V

= 5V and 3V at 217Hz

Shutdown power supply current

2.7

鈮?/div>

2.4W (typ)

3mA (typ)

80dB (typ)

0.01碌A (typ)

Features

No output coupling capacitors, snubber networks or

bootstrap capacitors required

Unity gain stable

Externally configurable gain

Ultra low current active low shutdown mode

BTL output can drive capacitive loads up to 100pF

鈥淐lick and pop鈥?suppression circuitry

2.7V - 9.0V operation

Available in space-saving microSMD package

Applications

Mobile Phones

PDAs

Typical Application

20129111

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer

庐

is a registered trademark of National Semiconductor Corporation.

漏 2005 National Semiconductor Corporation

DS201291

www.national.com

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