IC AMP AUDIO PWR 2.2W AB 28TSSOP

LM4839MT/NOPB

Manufacturer Part NumberLM4839MT/NOPB
DescriptionIC AMP AUDIO PWR 2.2W AB 28TSSOP
ManufacturerNational Semiconductor
SeriesBoomer®
TypeClass AB
LM4839MT/NOPB datasheet
 


Specifications of LM4839MT/NOPB

Output Type2-Channel (Stereo) with Stereo HeadphonesMax Output Power X Channels @ Load2.2W x 2 @ 3 Ohm; 95mW x 2 @ 32 Ohm
Voltage - Supply2.7 V ~ 5.5 VFeaturesBass Boost, Depop, Input Multiplexer, Mute, Shutdown, Thermal Protection, Volume Control
Mounting TypeSurface MountPackage / Case28-TSSOP
For Use WithLM4839MTBD - BOARD EVALUATION LM4839MTLead Free Status / RoHS StatusLead free / RoHS Compliant
Other names*LM4839MT
*LM4839MT/NOPB
LM4839MT
  
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LM4839
Stereo 2W Audio Power Amplifiers
with DC Volume Control, Bass Boost, and Input Mux
General Description
The LM4839 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4
1.0% THD+N, or 2.2W into 3
(Note 2) with less than 1.0%
THD+N.
Boomer
®
audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4839 incorporates a
DC volume control, stereo bridged audio power amplifiers,
selectable gain or bass boost, and an input mux making it
optimally suited for multimedia monitors, portable radios,
desktop, and portable computer applications.
The LM4839 features an externally controlled, low-power
consumption shutdown mode, and both a power amplifier
and headphone mute for maximum system flexibility and
performance.
Note 1: When properly mounted to the circuit board, the LM4839LQ and
LM4839MTE will deliver 2W into 4 . The LM4839MT will deliver 1.1W into
8 . See the Application Information section for LM4839LQ and LM4839MTE
usage information.
Note 2: An LM4839LQ and LM4839MTE that have been properly mounted
to the circuit board and forced-air cooled will deliver 2.2W into 3 .
Connection Diagrams
See NS Package Number LQA028AA for Exposed-DAP LLP
Boomer
®
is a registered trademark of NationalSemiconductor Corporation.
© 2002 National Semiconductor Corporation
Key Specifications
n P
at 1% THD+N
O
into 3
n
(Note 1) with less than
into 4
n
into 8
n
n Single-ended mode - THD+N at 85mW into
32
n Shutdown current
Features
n DC Volume Control Interface
n Input mux
n System Beep Detect
n Stereo switchable bridged/single-ended power amplifiers
n Selectable internal/external gain and bass boost
n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers
n Multimedia Monitors
n Portable Radios, PDAs, and Portable TVs
LLP Package
Top View
Order Number LM4839LQ
DS200134
April 2002
(LQ & MTE)
2.2W(typ)
(LQ & MTE)
2.0W(typ)
(LM4839) (MT, MTE, & LQ)
1.1W(typ)
1.0%(typ)
0.2µA(typ)
DS200134-83
www.national.com

LM4839MT/NOPB Summary of contents

  • Page 1

    ... Note 2: An LM4839LQ and LM4839MTE that have been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3 . Connection Diagrams See NS Package Number LQA028AA for Exposed-DAP LLP Boomer ® registered trademark of NationalSemiconductor Corporation. © 2002 National Semiconductor Corporation Key Specifications THD+N O into 3 n ...

  • Page 2

    Connection Diagrams See NS Package Number MXA28A for Exposed-DAP TSSOP www.national.com (Continued) TSSOP Package Top View Order Number LM4839MT See NS Package Number MTC28 for TSSOP Order Number LM4839MTE 2 DS200134-2 ...

  • 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 ESD Susceptibility (Note 12) ESD Susceptibility (Note 13) Junction Temperature Soldering Information Vapor Phase (60 sec.) Infrared (15 sec.) See AN-450 “ ...

  • Page 4

    Electrical Characteristics for Single-Ended Mode Operation (Notes 7, 10) The following specifications apply for V Symbol Parameter P Output Power O THD+N Total Harmonic Distortion+Noise PSRR Power Supply Rejection Ratio SNR Signal to Noise Ratio X Channel Separation talk Electrical ...

  • Page 5

    Electrical Characteristics for Bridged Mode Operation Note 15: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). (Continued) 5 www.national.com ...

  • Page 6

    Typical Application www.national.com 6 ...

  • Page 7

    Truth Table for Logic Inputs Mute Mux Control HP Sense Note 16: If system beep is detected on the Beep in pin (pin 11) and beep is fed to inputs, ...

  • Page 8

    Non-MTE Specific Characteristics THD+N vs Frequency DS200134-57 THD+N vs Frequency DS200134-15 THD+N vs Frequency DS200134-18 THD+N vs Frequency DS200134-21 www.national.com THD+N vs Frequency DS200134-58 THD+N vs Frequency DS200134-16 THD+N vs Frequency DS200134-19 THD+N vs Frequency DS200134-22 8 THD+N vs Frequency ...

  • Page 9

    Non-MTE Specific Characteristics THD+N vs Output Power DS200134-25 THD+N vs Output Power DS200134-28 THD+N vs Output Power DS200134-31 THD+N vs Output Power DS200134-34 (Continued) THD+N vs Output Power DS200134-26 THD+N vs Output Power DS200134-29 THD+N vs Output Power DS200134-32 THD+N ...

  • Page 10

    Non-MTE Specific Characteristics Output Power vs Load Resistance DS200134-62 Power Supply Rejection Ratio DS200134-35 Noise Floor DS200134-41 www.national.com (Continued) Output Power vs Load Resistance DS200134-6 Dropout Voltage DS200134-53 Noise Floor DS200134-42 10 Output Power vs Load Resistance DS200134-7 Output Power ...

  • Page 11

    Non-MTE Specific Characteristics Power Dissipation vs Output Power DS200134-51 Power Derating Curve DS200134-63 Output Power vs Supply voltage DS200134-54 (Continued) Power Dissipation vs Output Power DS200134-52 Crosstalk DS200134-49 Output Power vs Supply Voltage DS200134-56 11 External Gain/Bass Boost Characteristics DS200134-61 ...

  • Page 12

    Typical Performance Characteristics Output Power vs Load Resistance DS200134-62 Power Supply Rejection Ratio DS200134-35 Noise Floor DS200134-41 www.national.com Output Power vs Load Resistance DS200134-6 Dropout Voltage DS200134-53 Noise Floor DS200134-42 12 Output Power vs Load Resistance DS200134-7 Output Power vs ...

  • Page 13

    Typical Performance Characteristics Power Dissipation vs Output Power DS200134-51 Power Derating Curve DS200134-63 Output Power vs Supply voltage DS200134-54 (Continued) Power Dissipation vs Output Power DS200134-52 Crosstalk DS200134-49 Output Power vs Supply Voltage DS200134-56 13 External Gain/ Bass Boost Characteristics ...

  • Page 14

    Application Information EXPOSED-DAP MOUNTING CONSIDERATIONS The LM4839’s exposed-DAP (die attach paddle) packages (MTE, LQ) provide a low thermal resistance between the die and the PCB to which the part is mounted and soldered. This allows rapid heat transfer from the ...

  • Page 15

    Application Information The LM4839 has two operational amplifiers per channel. The maximum internal power dissipation per channel operating in the bridge mode is four times that of a single-ended ampli- fier. From Equation (3), assuming a 5V power supply and ...

  • Page 16

    Application Information Higher value capacitors need more time to reach a quiescent DC voltage (usually V /2) when charged with a fixed cur- DD rent. The amplifier’s output charges the input capacitor through the feedback resistor Thus, pops ...

  • Page 17

    Application Information microprocessor microcontroller. When using a switch, connect an external 10k pull-up resistor between the SHUTDOWN pin and V . Connect the switch between the DD SHUTDOWN pin and ground. Select normal amplifier opera- tion by closing ...

  • Page 18

    Application Information When the bass boost is enabled, the output amplifiers will be internally set at a gain low frequencies (gain bridged mode). As shown in Figure 1, CBS sets the cutoff frequency for ...

  • Page 19

    Volume Control Table ( Table 2 ) Gain (dB) Voltage Range (% of Vdd) Low High Recommended 0 77.5% 100.00% -1 75.0% 78.5% -2 72.5% 76.25% -3 70.0% 73.75% -4 67.5% 71.25% -5 65.0% 68.75% -6 62.5% 66.25% -8 60.0% ...

  • Page 20

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

  • Page 21

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Figure 4. Recommended LQ PC Board Layout: Component-Side Silkscreen 21 (Continued) DS200134-78 www.national.com ...

  • Page 22

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT www.national.com Figure 5. Recommended LQ PC Board Layout: Component-Side Layout 22 (Continued) DS200134-79 ...

  • Page 23

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Figure 6. Recommended LQ PC Board Layout: Upper Inner-Layer Layout 23 (Continued) DS200134-80 www.national.com ...

  • Page 24

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT www.national.com Figure 7. Recommended LQ PC Board Layout: Lower Inner-Layer Layout 24 (Continued) DS200134-81 ...

  • Page 25

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Figure 8. Recommended LQ PC Board Layout: Bottom-Side Layout 25 (Continued) DS200134-82 www.national.com ...

  • Page 26

    RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Analog Audio LM4839 LLP28 Eval Board (LQ Package) Assembly Part Number: 980011368-100 Revision: A1 Bill of Material Item Part Number Part Description 1 551011368-001 LM4838 Eval Board PCB 10 482911368-001 LM4838 28L LLP 20 151911368-001 ...

  • Page 27

    Recommended Printed Circuit Board Layout - MT/MTE Packages Top Layer SilkScreen + Pad - ( Not to Scale ) Top Layer - Not to scale - ( Not to Scale ) 27 DS200134-84 DS200134-85 www.national.com ...

  • Page 28

    Layer 2 - Not to scale - ( Not to Scale ) Layer Not to scale ) 28 DS200134-86 DS200134-87 ...

  • Page 29

    Bottom Layer - ( Not to scale ) 29 DS200134-88 www.national.com ...

  • Page 30

    Analog Audio LM4839 MSOP Eval Board Assembly Part Number: 980011373-100 Revision: A Bill of Material Item Part Number Part Description 1 551011373-001 LM4839 Eval Board PCB 10 482911373-001 20 151911368-001 Cer Cap 0.068µF 50V 10% 25 152911368-001 Tant Cap ...

  • Page 31

    Physical Dimensions inches (millimeters) unless otherwise noted NS Package Number LQA028AA For Exposed-DAP LLP LLP Package Order Number LM4839LQ 31 www.national.com ...

  • Page 32

    Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) TSSOP Package Order Number LM4839MT NS Package Number MTC28 for TSSOP 32 ...

  • Page 33

    Physical Dimensions inches (millimeters) unless otherwise noted (Continued) NS Package Number MXA28A for Exposed-DAP TSSOP Exposed-DAP TSSOP Package Order Number LM4839MTE 33 www.national.com ...

  • Page 34

    ... 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 ...