LM4882 National Semiconductor, LM4882 Datasheet

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LM4882

Manufacturer Part Number
LM4882
Description
250mW Audio Power Amplifier with Shutdown Mode
Manufacturer
National Semiconductor
Datasheet

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© 1998 National Semiconductor Corporation
LM4882
250mW Audio Power Amplifier with Shutdown Mode
General Description
The LM4882 is a single-ended audio power amplifier ca-
pable of delivering 250 mW of continuous average power
into an 8
Boomer
to provide high quality output power with a minimal amount
of external components using surface mount packaging.
Since the LM4882 does not require bootstrap capacitors or
snubber networks, it is optimally suited for low-power por-
table systems.
The LM4882 features an externally controlled, low power
consumption shutdown mode which is virtually clickless and
popless, as well as an internal thermal shutdown protection
mechanism.
The unity-gain stable LM4882 can be configured by external
gain-setting resistors.
Typical Application
*Refer to the Application Information Section for information concerning
proper selection of the input and output coupling capacitors.
Boomer
FIGURE 1. Typical Audio Amplifier Application Circuit
®
is a registered trademark of National Semiconductor Corporation.
®
audio power amplifiers were designed specifically
load with 1% (THD + N) from a 5V power supply.
DS100030
DS100030-1
Key Specifications
Features
n MSOP surface mount packaging
n “Click and Pop” Suppression Circuitry
n Supply voltages from 2.4V–5.5V
n Operating Temperature −40˚C to 85˚C
n Unity-gain stable
n External gain configuration capability
n No bootstrap capacitors, or snubber circuits are
Applications
n Personal Computers
n Cellular Phones
n General Purpose Audio
Connection Diagram
n THD + N at 1 kHz at 250 mW
n Output Power at 1% THD + N
n THD + N at 1 kHz at 85 mW
n Shutdown Current
necessary
continuous average output
power into 8
continuous average output
power into 32
at 1kHz into 4
See NS Package Number MUA08A or M08A
Order Number LM4882MM or LM4882M
MSOP and SOIC Package
Top View
DS100030-2
380mW (typ)
www.national.com
January 1998
0.7 µA (typ)
1.0% (max)
0.1% (typ)

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LM4882 Summary of contents

Page 1

... The LM4882 features an externally controlled, low power consumption shutdown mode which is virtually clickless and popless, as well as an internal thermal shutdown protection mechanism. The unity-gain stable LM4882 can be configured by external gain-setting resistors. Typical Application *Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors ...

Page 2

... A 2. 25˚C. A LM4882 Units Typical Limit (Limits) (Note 5) (Note 6) 2 4.0 mA (max) 0.5 5 µA (max (max) 380 mW 270 250 mW (min 480 mW 325 mW 125 mW 0 25˚C. A LM4882 Units Typical Limit (Limits) (Note 5) (Note 6) 1.2 mA 0.3 µ 105 ...

Page 3

... mWrms kHz V = 2.5V 200 mVrms, pin3 ripple f = 120 Hz JMAX )/ . For the LM4882 150˚C, and the typical junction-to-ambient thermal resistance, when board A JA JMAX resistor Refer to the section, Proper Selection of External Components, ...

Page 4

Typical Performance Characteristics THD+N vs Frequency DS100030-11 THD+N vs Frequency DS100030-24 THD+N vs Output Power DS100030-29 www.national.com (Continued) THD+N vs Frequency DS100030-23 THD+N vs Frequency DS100030-25 THD+N vs Output Power DS100030-4 4 THD+N vs Frequency DS100030-22 THD+N vs Output Power ...

Page 5

Typical Performance Characteristics THD+N vs Output Power DS100030-30 THD+N vs Output Power DS100030-20 Output Power vs Supply Voltage DS100030-12 (Continued) THD+N vs Output Power DS100030-18 THD+N vs Output Power DS100030-21 Output Power vs Supply Voltage DS100030-13 5 THD+N vs Output ...

Page 6

Typical Performance Characteristics Dropout Voltage vs Supply Voltage DS100030-28 Power Supply Rejection Ratio DS100030-38 Power Dissipation vs Output Power DS100030-15 www.national.com (Continued) Dropout Voltage vs Supply Voltage DS100030-37 Output Power vs Load Resistance DS100030-27 Supply Current vs Supply Voltage DS100030-16 ...

Page 7

Typical Performance Characteristics Open Loop Frequency Response DS100030-36 Frequency Response vs Output Capacitor Size DS100030-31 Typical Application Frequency Response DS100030-34 (Continued) Output Attenuation in Shutdown Mode DS100030-6 Frequency Response vs Output Capacitor Size DS100030-32 Typical Application Frequency Response DS100030-35 7 ...

Page 8

... While the LM4882 is tolerant of external com- ponent combinations, consideration to component values must be used to maximize overall system quality. The LM4882 is unity gain stable and this gives a designer maximum system flexibility. The LM4882 should be used in low gain configurations to minimize THD+N values, and maximize the signal to noise ratio ...

Page 9

... With a closed-loop gain of 1.4 and f V ing GBWP = 140 kHz which is much smaller than the (3) LM4882 GBWP of 12.5Mhz. This figure displays that if a de- signer has a need to design an amplifier with a higher gain, the LM4882 can still be used without running into bandwidth limitations. 9 ...

Page 10

10 ...

Page 11

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM4882 NS Package Number M08A 11 www.national.com ...

Page 12

... Italiano National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. Order Number LM4882 NS Package Number MUA08A 2. A critical component in any component of a life support ...

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