lm4923mmx National Semiconductor Corporation, lm4923mmx Datasheet

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lm4923mmx

Manufacturer Part Number
lm4923mmx
Description
1.1 Watt Fully Differential Audio Power Amplifier With Shutdown Select
Manufacturer
National Semiconductor Corporation
Datasheet
1.LM4923MMX.pdf (14 pages)
© 2007 National Semiconductor Corporation
LM4923
1.1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select
General Description
The LM4923 is a fully differential audio power amplifier pri-
marily designed for demanding applications in mobile phones
and other portable communication device applications. It is
capable of delivering 1.1 watt of continuous average power to
an 8Ω BTL load with less than 1% distortion (THD+N) from a
5V
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4923 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 LM4923 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by logic
low. Additionally, the LM4923 features an internal thermal
shutdown protection mechanism.
The LM4923 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during turn-on
and turn-off transitions.
Connection Diagrams
Boomer® is a registered trademark of National Semiconductor Corporation.
See NS Package Number LQB08A
DC
power supply.
Order Number LM4923LQ
LQ Package
Top View
 
20071330
200713
TT − Die Traceability
8 Pin LQ Marking
B2 − LM4923LQ
X − Date Code
G − Boomer
Key Specifications
Features
■
■
■
■
■
■
■
Applications
■
■
■
20071302
■ 
■ 
@ 1% THD+N
■ 
@ 1% THD+N
■ 
Fully differential amplification
Available in space-saving LLP package
Ultra low current shutdown mode
Can drive capacitive loads up to 100pF
Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
2.4 - 5.5V operation
No output coupling capacitors, snubber networks or
bootstrap capacitors required
Mobile phones
PDAs
Portable electronic devices
Improved PSRR at 217Hz
Power Output at 5.0V
Power Output at 3.3V
Shutdown Current
See NS Package Number MUA08A
See Order Number LM4923MM
8 Pin MSOP Package
Top View
September 2007
www.national.com
400mW(typ)
0.1µA(typ)
200713a1
85dB(typ)
1.1W(typ)

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lm4923mmx Summary of contents

Page 1

... Connection Diagrams LQ Package 20071330 Top View Order Number LM4923LQ See NS Package Number LQB08A Boomer® registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation Key Specifications ■  Improved PSRR at 217Hz ■  Power Output at 5. THD+N ■ ...

Page 2

Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 20071313 ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction ...

Page 4

Symbol Parameter V Shutdown Voltage Input High SDIH V Shutdown Voltage Input Low SDIL Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to ...

Page 5

Typical Performance Characteristics THD+N vs Frequency = 8Ω 2.6V THD+N vs Frequency = 8Ω 5V 400mW THD+N vs Frequency = 4Ω 3V, ...

Page 6

THD+N vs Output Power V = 2.6V THD+N vs Output Power PSRR vs Frequency = 8Ω, Input terminated www.national.com = 4Ω L 20071310 = 8Ω 20071314 ...

Page 7

Output Power vs Supply Voltage = 8Ω 20071301 CMRR vs Frequency = 8Ω 3V 20071326 PSRR vs Common Mode Voltage = 8Ω 217Hz 20071316 CMRR ...

Page 8

Power Dissipation vs Output Power Power Derating Curve Noise Floor www.national.com = 8Ω 20071319 20071318 20071320 8 Power Dissipation vs Output Power = 8Ω 3V ...

Page 9

Output Power vs Load Resistance Application Information DIFFERENTIAL AMPLIFIER EXPLANATION The LM4923 is a fully differential audio amplifier that features differential input and output stages. Internally this is accom- plished by two circuits: a differential amplifier and a common mode ...

Page 10

Demonstration Board Layout section. Further detailed and specific information concerning PCB layout, fabrication, and mounting an LLP package is available from National Semiconductor's package Engineering Group under applica- tion note AN1187. PCB LAYOUT AND SUPPLY REGULATION CONSIDERATIONS FOR DRIVING ...

Page 11

In- put signals equal to or greater than 1Vrms are available from sources such as audio codecs. Please refer to the Audio Power Amplifier Design section for a more complete ...

Page 12

Revision History Rev Date 1.0 09/28/07 www.national.com Description Added the MSOP package, then released. 12 ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted LQ Package Order Number LM4923LQ NS Package Number LQB08A MSOP Package Order Number LM4923MM NS Package Number MUA08A 13 www.national.com ...

Page 14

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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