lm4902ld National Semiconductor Corporation, lm4902ld Datasheet

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lm4902ld

Manufacturer Part Number
lm4902ld
Description
265mw At 3.3v Supply Audio Power Amplifier With Shutdown Mode
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2002 National Semiconductor Corporation
LM4902
265mW at 3.3V Supply Audio Power Amplifier with
Shutdown Mode
General Description
The LM4902 is a bridged audio power amplifier capable of
delivering 265mW of continuous average power into an 8
load with 1% THD+N from a 3.3V power supply.
Boomer
to provide high quality output power from a low supply volt-
age while requiring a minimal amount of external compo-
nents. Since the LM4902 does not require output coupling
capacitors, bootstrap capacitors or snubber networks, it is
optimally suited for low-power portable applications.
The LM4902 features an externally controlled, low power
consumption shutdown mode, and thermal shutdown protec-
tion.
The closed loop response of the unity-gain stable LM4902
can be configured by external gain-setting resistors.
Key Specifications
Typical Application
j
Boomer
THD+N at 1kHz for 265mW continuous
average output power into 8 ,
V
DD
®
is a registered trademark of National Semiconductor Corporation.
®
= 3.3V
audio power amplifiers were designed specifically
FIGURE 1. Typical Audio Amplifier Application Circuit
DS200298
1.0% (max)
Features
n MSOP and LLP packaging
n No output coupling capacitors, bootstrap capacitors, or
n Thermal shutdown protection circuitry
n Unity-gain stable
n External gain configuration capability
n Latest generation ’click and pop’ suppression circuitry
Applications
n Cellular phones
n PDA’s
n Any portable audio application
j
j
snubber circuits are necessary
THD+N at 1kHz for 675mW continuous
Shutdown current
average output power into 8 ,
V
DD
= 5V
20029801
February 2002
www.national.com
1.0% (max)
0.1µA (typ)

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lm4902ld Summary of contents

Page 1

... THD+N at 1kHz for 265mW continuous j average output power into 3.3V DD Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation THD+N at 1kHz for 675mW continuous j average output power into Shutdown current j ...

Page 2

... Top View Order Number LM4902MM See NS Package Number MUA08A LLP Top View Order Number LM4902LD See NS Package Number LDA08B www.national.com 20029802 20029875 2 MSOP Marking 20029878 Top View G - Boomer Family C3 - LM4902MM LLP Marking 20029877 Top View XY - Date Code TT - Die Traceability G - Boomer Family A3 - LM4902LD ...

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

Electrical Characteristics The following specifications apply for V 25˚C Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD V Output Offset Voltage OS P Output Power O THD+N Total Harmonic Distortion+Noise PSRR Power Supply Rejection Ratio Note ...

Page 5

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 amplifier’s input ...

Page 6

Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency THD+N vs Frequency www.national.com (Continued) THD+N vs Frequency 20029834 THD+N vs Frequency 20029836 THD+N vs Frequency 20029838 6 20029835 20029837 20029839 ...

Page 7

Typical Performance Characteristics THD+N vs Frequency THD+N vs Output Power THD+N vs Output Power (Continued) THD+N vs Output Power 20029840 THD+N vs Output Power 20029842 THD+N vs Output Power 20029844 7 20029841 20029843 20029845 www.national.com ...

Page 8

Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power www.national.com (Continued) THD+N vs Output Power 20029846 THD+N vs Output Power 20029848 THD+N vs Output Power 20029850 8 20029847 20029849 20029851 ...

Page 9

Typical Performance Characteristics Output Power vs Supply Voltage Output Power vs Supply Voltage Output Power vs Load Resistance (Continued) Output Power vs Supply Voltage 20029852 Output Power vs Supply Voltage 20029854 Power Dissipation vs Output Power 20029856 9 20029853 20029855 ...

Page 10

Typical Performance Characteristics Power Dissipation vs Output Power Clipping Voltage vs Supply Voltage Noise Floor www.national.com (Continued) Power Dissipation vs Output Power 20029858 Noise Floor 20029860 Frequency Response vs Input Capacitor Size 20029862 10 20029859 20029861 20029871 ...

Page 11

Typical Performance Characteristics Power Supply Rejection Ratio Power Supply Rejection Ratio Power Supply Rejection Ratio vs Supply Voltage (Continued) Power Supply Rejection Ratio 20029863 Power Supply Rejection Ratio 20029865 Power Supply Rejection Ratio vs Supply Voltage 20029867 11 20029864 20029866 ...

Page 12

... Typical Performance Characteristics Power Derating Curve Open Loop Frequency Response Note 12: This curve shows the LM4902LD’s thermal dissipation ability at different ambient temperatures given the exposed-DAP of the part is soldered to a plane of 1oz. Cu with an area given in the label of each curve. www.national.com (Continued) ...

Page 13

... PCB cop- per traces, ground plane, and surrounding air. This allows the LM4902LD to operate at higher output power levels in higher ambient temperatures than the MM package. Failing to optimize thermal design may compromise the high power performance and activate unwanted, though necessary, thermal shutdown protection ...

Page 14

Application Information Typical applications employ a 5V regulator with 10µF and a 0.1µF bypass capacitors which aid in supply stability, but do not eliminate the need for bypassing the supply nodes of the LM4902. The selection of bypass capacitors, especially ...

Page 15

Application Information ( From Equation 5, the minimum A is 1.55; use A VD Since the desired input impedance was and with ratio of ...

Page 16

Application Information DIFFERENTIAL AMPLIFIER CONFIGURATION FOR LM4902 www.national.com (Continued) 16 20029874 ...

Page 17

Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.118" Wide) Molded Mini Small Outline Package Order Number LM4902MM NS Package Number MUA08A 17 www.national.com ...

Page 18

... 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. inches (millimeters) unless otherwise noted (Continued) Order Number LM4902LD NS Package Number LDA08B 2 ...

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