LM4941SD/NOPB National Semiconductor, LM4941SD/NOPB Datasheet

IC AMP AUDIO PWR 1.54W MONO 8LLP

LM4941SD/NOPB

Manufacturer Part Number
LM4941SD/NOPB
Description
IC AMP AUDIO PWR 1.54W MONO 8LLP
Manufacturer
National Semiconductor
Series
Boomer®, PowerWise®r
Type
Class ABr
Datasheet
1.LM4941TMNOPB.pdf (16 pages)

Specifications of LM4941SD/NOPB

Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1.54W x 1 @ 8 Ohm
Voltage - Supply
2.4 V ~ 5.5 V
Features
Depop, Differential Inputs, Shutdown, Thermal Protection
Mounting Type
Surface Mount
Package / Case
8-LLP
Operational Class
Class-AB
Audio Amplifier Output Configuration
1-Channel Mono
Output Power (typ)
1.54x1@8OhmW
Audio Amplifier Function
Speaker
Total Harmonic Distortion
0.04@8Ohm@0.7W%
Single Supply Voltage (typ)
3/5V
Dual Supply Voltage (typ)
Not RequiredV
Power Supply Requirement
Single
Rail/rail I/o Type
No
Power Supply Rejection Ratio
95dB
Single Supply Voltage (min)
2.4V
Single Supply Voltage (max)
5.5V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
LLP EP
Amplifier Class
AB
No. Of Channels
1
Output Power
1.25W
Supply Voltage Range
2.4V To 5.5V
Load Impedance
8ohm
Operating Temperature Range
-40°C To +85°C
Amplifier Case Style
LLP
Rohs Compliant
Yes
For Use With
LM4941SDBD - BOARD EVALUATION LM4941
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM4941SD
LM4941SDTR
© 2007 National Semiconductor Corporation
LM4941
1.25 Watt Fully Differential Audio Power Amplifier With RF
Suppression and Shutdown
General Description
The LM4941 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 1.25 watts of continuous average power
to a 8Ω load with less than 1% distortion (THD+N) from a
5V
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other small form factor
applications where minimal PCB space is a primary require-
ment.
The LM4941 also features proprietary internal circuitry that
suppresses the coupling of RF signals into the chip. This is
important because certain types of RF signals (such as GSM)
can couple into audio amplifiers in such a way that part of the
signal is heard through the speaker. The RF suppression cir-
cuitry in the LM4941 makes it well-suited for portable appli-
cations in which strong RF signals generated by an antenna
from or a cellular phone or other portable electronic device
may couple audibly into the amplifier.
Other features include a low-power consumption shutdown
mode, internal thermal shutdown protection, and advanced
pop & click circuitry.
Typical Application
Boomer® is a registered trademark of National Semiconductor Corporation.
DC
power supply. The LM4941 does not require output
 
FIGURE 1. Typical Audio Amplifier Application Circuit
201703
Key Specifications
Features
■
■
■
■
■
■
■
■
Applications
■
■
■
■ 
■ 
 
■ 
 
■ 
R
R
Improved RF suppression, by up to 20dB over previous
designs in selected applications
Fully differential amplification
Available in space-saving micro SMD 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, V
L
Power Output, V
L
Shutdown Current
= 8Ω, 1% THD+N
= 8Ω, 1% THD+N
DD
DD
20170366
= 5.0V,
= 3.0V,
www.national.com
430mW (typ)
1.25W (typ)
March 2007
0.1µA (typ)
95dB (typ)

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LM4941SD/NOPB Summary of contents

Page 1

... Other features include a low-power consumption shutdown mode, internal thermal shutdown protection, and advanced pop & click circuitry. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer® registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation Key Specifications ■  Improved PSRR at 217Hz ■ ...

Page 2

Connection Diagrams 9 Bump micro SMD Package Top View Order Number LM4941TM See NS Package Number TMD09AAA LLP Package Top View Order Number LM4941SD See NS Package Number SDA08C www.national.com micro SMD Markings V = Die Traceability G = Boomer ...

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 Electrical Characteristics V Symbol Parameter ...

Page 4

Electrical Characteristics V Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD P Output Power O THD+N Total Harmonic Distortion + Noise PSRR Power Supply Rejection Ratio CMRR Common-Mode Rejection Ratio V Output Offset Voltage OS V ...

Page 5

Typical Performance Characteristics THD+N vs Output Power = 8Ω 1kHz THD+N vs Frequency = 8Ω 5V 700mW PSRR vs Frequency = 8Ω, Inputs terminated ...

Page 6

CMRR vs Frequency PSRR vs Common Mode Voltage = 8Ω 217Hz Power Dissipation vs Output Power www.national.com = 8Ω 20170373 ...

Page 7

Output Power vs Supply Voltage = 8Ω, Top-THD+N = 10%; Bot-THD Output Power vs Load Resistance Top-V = 5V, 10% THD+N, Topmid-V DD Bot-V = 3V, 10% THD+N, Botmid-V DD Power Derating Curve = 8Ω f ...

Page 8

Application Information OPTIMIZING RF IMMUNITY The internal circuitry of the LM4941 suppresses the amount of RF signal that is coupled into the chip. However, certain external factors, such as output trace length, output trace ori- entation, distance between the chip ...

Page 9

This, however, does not eliminate the need for bypass- ing the supply nodes of the LM4941. The LM4941 will operate without the bypass capacitor C , although the PSRR may de- B crease. A 1µF capacitor is recommended for ...

Page 10

Recommended TM Board Layout Recommended TM Board Layout: Top Layer Recommended TM Board Layout: Bottom Layer www.national.com 20170321 Recommended TM Board Layout: Top Overlay 20170320 10 20170322 ...

Page 11

Recommended LLP Board Layout Recommended LLP Board Layout: Top Layer Recommended LLP Board Layout: Bottom Layer 20170376 Recommended LLP Board Layout: Top Overlay 20170377 11 20170375 www.national.com ...

Page 12

LM4941 Reference Design Boards Bill Of Materials Designator Value Ri1, Ri2 20kΩ Rf1, Rf2 20kΩ 0Ω Ci1, Ci2 1μF Cb, Cs In, Out, VDD, J1 www.national.com Tolerance Part Description 0.10% 1/10W, 0.1% 0805 Resistor 0.10% 1/10W, 0.1% 0805 Resistor 1/10W, ...

Page 13

Revision History Rev Date 1.0 06/28/06 1.1 07/10/06 1.2 08/04/06 1.3 10/12/06 Edited some of the Typical Performance curves' labels and some text edits. 1.4 10/25/06 1.5 11/07/06 1.6 11/15/06 1.7 03/09/07 Changed the Limit value from ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted micro SMD Package Order Number LM4941TM NS Package Number TMD09AAA X1 = 1.25mm X2 = 1.25mm X3 = 0.6mm LLP Package Order Number LM4941SD NS Package Number SDA08C 14 ...

Page 15

Notes 15 www.national.com ...

Page 16

... 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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