lm4900mm National Semiconductor Corporation, lm4900mm Datasheet

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lm4900mm

Manufacturer Part Number
lm4900mm
Description
265mw At 3.3v Supply Audio Power Amplifier With Shutdown Mode
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2001 National Semiconductor Corporation
LM4900
265mW at 3.3V Supply Audio Power Amplifier with
Shutdown Mode
General Description
The LM4900 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 LM4900 does not require output coupling
capacitors, bootstrap capacitors or snubber networks, it is
optimally suited for low-power portable applications.
The LM4900 features an externally controlled, low power
consumption shutdown mode, and thermal shutdown protec-
tion.
The closed loop response of the unity-gain stable LM4900
can be configured by external gain-setting resistors.
Key Specifications
j
j
j
Typical Application
Boomer
FIGURE 1. Typical Audio Amplifier Application Circuit
THD+N at 1kHz for 265mW continuous
THD+N at 1kHz for 675mW continuous
Shutdown current
average output power into 8 ,
V
average output power into 8 ,
V
DD
DD
®
is a registered trademark of National Semiconductor Corporation.
®
= 3.3V
= 5V
audio power amplifiers were designed specifically
DS200064
1.0% (max)
1.0% (max)
0.1µA (typ)
Features
n MSOP, LLP, and SOP 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
snubber circuits are necessary
DS200064-1
September 2001
www.national.com

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lm4900mm Summary of contents

Page 1

... Shutdown current j Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2001 National Semiconductor Corporation Features n MSOP, LLP, and SOP packaging n No output coupling capacitors, bootstrap capacitors, or snubber circuits are necessary n Thermal shutdown protection circuitry ...

Page 2

... Connection Diagrams www.national.com MSOP and SOP Package DS200064-2 Top View Order Number LM4900MM, LM4900M See NS Package Number MUA08A, M08A LLP Package DS200064-76 Top View Order Number LM4900LD See NS Package Number LDA08B 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 ...

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 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 terminals. Also ...

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 DS200064-34 THD+N vs Frequency DS200064-36 THD+N vs Frequency DS200064-38 6 DS200064-35 DS200064-37 DS200064-39 ...

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 DS200064-40 THD+N vs Output Power DS200064-42 THD+N vs Output Power DS200064-44 7 DS200064-41 DS200064-43 DS200064-45 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 DS200064-46 THD+N vs Output Power DS200064-48 THD+N vs Output Power DS200064-50 8 DS200064-47 DS200064-49 DS200064-51 ...

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 DS200064-52 Output Power vs Supply Voltage DS200064-54 Power Dissipation vs Output Power DS200064-56 9 DS200064-53 DS200064-55 ...

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 DS200064-58 Noise Floor DS200064-60 Frequency Response vs Input Capacitor Size DS200064-62 10 DS200064-59 DS200064-61 DS200064-71 ...

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 DS200064-63 Power Supply Rejection Ratio DS200064-65 Power Supply Rejection Ratio vs Supply Voltage DS200064-67 11 DS200064-64 DS200064-66 ...

Page 12

... Note 12: This curve shows the LM4900LD’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) LM4900MM Power Derating Curve DS200064-69 LM4900LD Power Derating Curve (Note 12) DS200064-70 ...

Page 13

Application Information EXPOSED-DAP PACKAGE PCB MOUNTING CONSIDERATION The LM4900’s exposed-DAP (die-attach paddle) package (LD) provides a low thermal resistance between the die and the PCB to which the part is mounted and soldered. This allows rapid heat from the die ...

Page 14

Application Information POWER SUPPLY BYPASSING As with any power amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. The capacitor location on both the bypass and power supply pins should be as close to ...

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 FIGURE 2. Differential Amplifier Configuration for LM4900 www.national.com (Continued) 16 DS200064-74 ...

Page 17

... Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.118" Wide) Molded Mini Small Outline Package Order Number LM4900MM NS Package Number MUA08A 17 www.national.com ...

Page 18

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Order Number LM4900LD NS Package Number LDA08B SO Order Number LM4900M NS Package Number M08A 18 ...

Page 19

... 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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