8

7

3

4

2

1

5

6

GND

SD

IN-

IN+

BYP

IN-

IN+

GND

BYP

SD

LM4923, LM4923LQBD

www.ti.com

SNAS211D – JULY 2004 – REVISED FEBRUARY 2009

LM4923

1.1 Watt Fully Differential Audio Power Amplifier

With Shutdown Select

Check for Samples: LM4923, LM4923LQBD

1

FEATURES

DESCRIPTION

2

•

Fully Differential Amplification

The LM4923 is a fully differential audio power

•

Available in Space-saving WQFN Package

amplifier

primarily

designed

for

demanding

•

Ultra Low Current Shutdown Mode

applications in mobile phones and other portable

communication device applications. It is capable of

•

Can Drive Capacitive Loads up to 100pF

delivering 1.1 watt of continuous average power to an

•

Improved Pop & Click Circuitry Eliminates

8

Ω BTL load with less than 1% distortion (THD+N)

Noises During Turn-on and Turn-off

Transitions

Boomer

audio

power

amplifiers

were

designed

•

2.4 - 5.5V Operation

specifically to provide high quality output power with a

•

No Output Coupling Capacitors, Snubber

minimal

amount

of

external

components.

The

Networks or Bootstrap Capacitors Required

LM4923 does not require output coupling capacitors

or bootstrap capacitors, and therefore is ideally suited

APPLICATIONS

for mobile phone and other low voltage applications

where minimal power consumption is a primary

•

Mobile Phones

requirement.

•

PDAs

The LM4923 features a low-power consumption

•

Portable Electronic Devices

shutdown mode. To facilitate this, Shutdown may be

enabled by logic low. Additionally, the LM4923

KEY SPECIFICATIONS

features an internal thermal shutdown protection

mechanism.

•

Improved PSRR at 217Hz 85dB(typ)

•

Power Output at 5.0V @ 1% THD+N 1.1W(typ)

The LM4923 contains advanced pop & click circuitry

which eliminates noises which would otherwise occur

•

Power Output at 3.3V @ 1% THD+N

during turn-on and turn-off transitions.

400mW(typ)

•

Shutdown Current 0.1

μA(typ)

Connection Diagram

Figure 1. NGP Package, Top View

Figure 2. 8 Pin VSSOP Package, Top View

See Package Number NGP0008A

See Package Number DGK0008A

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.