LM4892M National Semiconductor, LM4892M Datasheet

LM4892M

Manufacturer Part Number

LM4892M

Description

Manufacturer

National Semiconductor

Datasheets

1.LM4892IBPX.pdf (22 pages)

2.LM4892M.pdf (22 pages)

3.LM4892M.pdf (22 pages)

Specifications of LM4892M

Case

SOIC-8

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LM4892

1 Watt Audio Power Amplifier with Headphone Sense

General Description

The LM4892 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

power supply. Switching between bridged speaker mode and

headphone (single-ended) mode is accomplished using the

headphone sense pin.

Boomer audio power amplifiers are designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4892 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.

The LM4892 features a low-power consumption shutdown

mode, which is achieved by driving the shutdown pin with

logic low. Additionally, the LM4892 features an internal ther-

mal shutdown protection mechanism.

The LM4892 contains advanced pop & click circuitry which

eliminates noise which would otherwise occur during turn-on

and turn-off transitions.

The LM4892 is unity-gain stable and can be configured by

external gain-setting resistors.

Typical Application

Boomer

is a registered trademark of National Semiconductor Corporation.

FIGURE 1. Typical Audio Amplifier Application Circuit (Pin #’s apply to M & MM packages)

DS200127

Key Specifications

Features

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

n Ultra low current shutdown mode

n BTL output can drive capacitive loads up to 500pF

n Improved pop & click circuitry eliminates noise during

n 2.2 - 5.5V operation

n No output coupling capacitors, snubber networks or

n Thermal shutdown protection

n Unity-gain stable

n External gain configuration capability

n Headphone amplifier mode

Applications

n Mobile Phones

n PDAs

n Portable electronic devices

MSOP, and SOIC

turn-on and turn-off transitions

bootstrap capacitors required

Power Output at 5.0V & 1% THD

Power Output at 3.3V & 1% THD

Shutdown Current

PSRR at 217Hz, V

20012701

= 5V, 8Ω Load

October 2002

400mW (typ)

www.national.com

0.1µA (typ)

62dB (typ)

1.0W (typ)

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