LM4876M National Semiconductor, LM4876M Datasheet

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LM4876M

Manufacturer Part Number
LM4876M
Description
Manufacturer
National Semiconductor
Datasheet

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© 2003 National Semiconductor Corporation
LM4876
1.1W Audio Power Amplifier with Logic Low Shutdown
General Description
The LM4876 is a single 5V supply bridge-connected audio
power amplifier capable of delivering 1.1W (typ) of continu-
ous average power to an 8Ω load with 0.5% THD+N.
Like other audio amplifiers in the Boomer series, the LM4876
is designed specifically to provide high quality output power
with a minimal amount of external components. The LM4876
does not require output coupling capacitors, bootstrap ca-
pacitors, or snubber networks. It is perfectly suited for low-
power portable systems.
The LM4876 features an active low externally controlled,
micro-power shutdown mode. Additionally, the LM4876 fea-
tures an internal thermal shutdown protection mechanism.
For PCB space efficiency, the LM4876 is available in MSOP
and SO surface mount packages.
The unity-gain stable LM4876’s closed loop gain is set using
external resistors.
Typical Application
Boomer
®
is a registered trademark of National Semiconductor Corporation.
FIGURE 1. Typical LM4876 Audio Amplifier Application Circuit.
Numbers in ( ) are specific to the 10-pin MSOP package
DS101299
Key Specifications
Features
n Does not require output coupling capacitors, bootstrap
n 10-pin MSOP and 8-pin SO packages
n Unity-gain stable
n External gain set
Applications
n Mobile Phones
n Portable Computers
n Desktop Computers
n Low-Voltage Audio Systems
j
j
j
j
capacitors, or snubber circuits
average output power into 8Ω
with 10% THD+N
THD+N at 1kHz for 1W continuous
Supply voltage range
Output power at 1kHz into 8Ω
Shutdown current
10129901
www.national.com
2.0V to 5.5V
0.01µA (typ)
0.5% (max)
March 2003
1.5W (typ)

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LM4876M Summary of contents

Page 1

... Typical Application FIGURE 1. Typical LM4876 Audio Amplifier Application Circuit. Numbers are specific to the 10-pin MSOP package Boomer ® registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation Key Specifications j THD+N at 1kHz for 1W continuous average output power into 8Ω ...

Page 2

... Connection Diagrams www.national.com Mini Small Outline MSOP Package 10129925 Top View Order Number LM4876MM See NS Package Number MUB10A Small Outline SO Package 10129902 Top View Order Number LM4876M See NS Package Number M08A 2 ...

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 Soldering Information Small Outline Package Vapor Phase (60 sec ...

Page 4

External Components Description (Figure 1) Components 1. R Inverting input resistance which sets the closed-loop gain in conjunction with R i high pass filter with Input coupling capacitor which blocks the DC voltage at the amplifiers input ...

Page 5

Typical Performance Characteristics THD+N vs Output Power Output Power vs Supply Voltage Output Power vs Supply Voltage (Continued) THD+N vs Output Power 10129907 10129909 10129911 5 10129908 Output Power vs Supply Voltage 10129910 Output Power vs Supply Voltage 10129911 www.national.com ...

Page 6

Typical Performance Characteristics Output Power vs Load Resistance Power Derating Curve Noise Floor www.national.com (Continued) 10129912 10129914 Frequency Response vs 10129916 6 Power Dissipation vs Output Power 10129913 Clipping Voltage vs Supply Voltage 10129915 Input Capacitor Size 10129917 ...

Page 7

Typical Performance Characteristics Power Supply Rejection Ratio Supply Current vs Supply Voltage (Continued) 10129918 LM4876 10129920 7 Open Loop Frequency Response 10129919 Supply Current vs Shutdown Voltage @ VDD = 5/3.3/2.6Vdc 10129923 www.national.com ...

Page 8

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4876 consists of two opera- tional amplifiers. External resistors R loop gain of Amp1, whereas two internal 40kΩ resistors set Amp2’s gain at -1. The LM4876 drives a load, ...

Page 9

Application Information mance can be compromised. The selection of bypass ca- pacitor values, especially C , depends on desired PSRR B requirements, click and pop performance (as explained in the section, Proper Selection of External Components), system cost, and size ...

Page 10

Application Information AUDIO POWER AMPLIFIER DESIGN Audio Amplifier Design: Driving 1W into an 8Ω Load The following are the desired operational parameters: Power Output Load Impedance Input Level Input Impedance Bandwidth 100Hz–20kHz The design begins by specifying the minimum supply ...

Page 11

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM4876MM NS Package Number MUB10A Order Number LM4876M NS Package Number M08A 11 www.national.com ...

Page 12

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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