LM4923LQBD National Semiconductor, LM4923LQBD Datasheet

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LM4923LQBD

Manufacturer Part Number
LM4923LQBD
Description
BOARD EVALUATION LM4923LQ
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet

Specifications of LM4923LQBD

Amplifier Type
Class AB
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1.1W x 1 @ 8 Ohm
Voltage - Supply
2.3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4923
Lead Free Status / RoHS Status
Not applicable / Not applicable
© 2009 National Semiconductor Corporation
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
LM4923
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
February 19, 2009
www.national.com
400mW(typ)
0.1µA(typ)
85dB(typ)
1.1W(typ)
200713a1

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LM4923LQBD 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. © 2009 National Semiconductor Corporation LM4923   Key Specifications ■  Improved PSRR at 217Hz ■  ...

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 Temperature Thermal Resistance Electrical Characteristics V ...

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

Semiconductor's package Engineering Group under applica- tion note AN1187. PCB LAYOUT AND SUPPLY REGULATION CONSIDERATIONS FOR DRIVING 4Ω LOADS Power dissipated by a load is a function of the voltage swing across the load and the load's impedance. As load ...

Page 11

When used in its typical application as a fully differential power amplifier the LM4923 does not require input coupling capacitors for input sources with DC common-mode voltages of less than V lowable input common-mode voltage ...

Page 12

Revision History Rev Date 1.0 09/28/07 1.01 12/17/07 1.02 02/19/09 www.national.com Description Added the MSOP package, then released. Updated the mktg outline LQB08A into the rev B. Fixed typo labels on the typical circuit diagram. 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

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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