LM4810MA

Manufacturer Part NumberLM4810MA
DescriptionDual 105mW Headphone Amplifier with Active-High Shutdown Mode
ManufacturerNational Semiconductor
LM4810MA datasheet
 


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LM4810
Dual 105mW Headphone Amplifier with Active-High
Shutdown Mode
General Description
The LM4810 is a dual audio power amplifier capable of
delivering 105mW per channel of continuous average power
into a 16Ω load with 0.1% (THD+N) from a 5V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4810 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The unity-gain stable LM4810 can be configured by external
gain-setting resistors.
The LM4810 features an externally controlled, active-high,
micropower consumption shutdown mode, as well as an
internal thermal shutdown protection mechanism.
Key Specifications
n THD+N at 1kHz, 105mW continuous average power into
16Ω
Typical Application
*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation
n THD+N at 1kHz, 70mW continuous average power into
32Ω
n Shutdown Current
Features
n Active-high shutdown mode
n LLP, MSOP, and SO surface mount packaging
n "Click and Pop" suppression circuitry
n Low shutdown current
n No bootstrap capacitors required
n Unity-gain stable
Applications
n Cellular Phones
n Personal Computers
n Microphone Preamplifier
n PDA’s
0.1% (typ)
DS200089
November 2002
0.1% (typ)
0.4µA (typ)
20008901
www.national.com

LM4810MA Summary of contents

  • Page 1

    ... Application Information Section for information concerning proper selection of the input and output coupling capacitors. FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation n THD+N at 1kHz, 70mW continuous average power into 32Ω ...

  • Page 2

    ... MSOP Package Top View Order NumberLM4810MM See NS Package Number MUA08A LLP Package Top View Order NumberLM4810LD See NS Package Number LDA08B SO Marking www.national.com 20008902 See NS Package Number M08A 20008986 20008992 2 SO Package 20008902 Top View Order NumberLM4810MA MSOP Marking 20008991 LLP Marking 20008993 ...

  • 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 ESD Susceptibility (Note 4) ESD Machine Model (Note 8) Junction Temperature ( Soldering Information (Note 1) Small Outline Package Vapor Phase (60 sec.) Infrared (15 sec ...

  • Page 4

    Electrical Characteristics The following specifications apply for V Symbol Parameter PSRR Power Supply Rejection Ratio V Shutdown Voltage Input High SDIH V Shutdown Voltage Input Low SDIL Electrical Characteristics The following specifications apply for V Symbol Parameter I Supply Current ...

  • Page 5

    External Components Description Components The inverting input resistance, along with pass filter with f c The input coupling capacitor blocks DC voltage at the amplifier’s input terminals create a highpass filter with f ...

  • 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 20008967 THD+N vs Frequency 20008969 THD+N vs Frequency 20008971 6 20008968 20008970 20008972 ...

  • Page 7

    Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power (Continued) THD+N vs Output Power 20008973 THD+N vs Output Power 20008975 THD+N vs Output Power 20008977 7 20008974 20008976 20008978 www.national.com ...

  • Page 8

    Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power Output Power vs Load Resistance www.national.com (Continued) THD+N vs Output Power 20008979 Output Power vs Load Resistance 20008981 Output Power vs Load Resistance 20008923 8 20008980 20008922 20008924 ...

  • Page 9

    Typical Performance Characteristics Output Power vs Supply Voltage Output Power vs Power Supply Power Dissipation vs Output Power (Continued) Output Power vs 20008925 Dropout Voltage vs 20008927 Power Dissipation vs 20008929 9 Power Supply 20008926 Supply Voltage 20008984 Output Power ...

  • Page 10

    Typical Performance Characteristics Power Dissipation vs Output Power Noise Floor Open Loop Frequency Response www.national.com (Continued) Channel Separation 20008931 Power Supply Rejection Ratio 20008934 Frequency Response 20008950 10 20008982 20008983 Open Loop 20008951 ...

  • Page 11

    ... When active, the Further detailed and specific information concerning PCB layout, fabrication, and mounting an LD (LLP) package is available from National Semiconductor’s Package Engineer- ing Group under application note AN1187. POWER DISSIPATION may increase the ...

  • Page 12

    Application Information creased, the load impedance increased or T the typical application power supply, with a 32Ω load, the maximum ambient temperature possible without violating the maximum junction temperature is approximately 133.2˚C provided that device operation is ...

  • Page 13

    Application Information the magnitude of “clicks and pops”. Increasing the value of C reduces the magnitude of turn-on pops. However, this B presents a tradeoff: as the size of C increases, the turn-on B time increases. There is a linear ...

  • Page 14

    Application Information A . With a closed-loop gain of 1.5 and f V resulting GBWP = 150kHz which is much smaller than the LM4810’s GBWP of 900kHz. This figure displays that if a Demonstration Board Schematic FIGURE 2. LM4810 Demonstration ...

  • Page 15

    Demonstration Board Layout FIGURE 3. Recommended PC Board Layout Component-Side Silkscreen FIGURE 4. Recommended PC Board Layout Component-Side Layout FIGURE 5. Recommended PC Board Layout Bottom-Side Layout 15 20008960 20008961 20008962 www.national.com ...

  • Page 16

    Demonstration Board Layout www.national.com (Continued) FIGURE 6. Recommended LD PC Board Layout Component-Side Silkreen FIGURE 7. Recommended LD PC Board Layout Component-Side Layout FIGURE 8. Recommended LD PC Board Layout Bottom-Side Layout 16 20008987 20008988 20008989 ...

  • Page 17

    ... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM4810MM NS Package Number MUA08A Order Number LM4810MA NS Package Number M08A 17 www.national.com ...

  • Page 18

    ... 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 ...