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LM4868LQ Datasheet

  • LM4868LQ

  • Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coup...

  • 28頁(yè)

  • NSC

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LM4868 Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo
Headphone Function
August 2002
LM4868
Output-Transient-Free Dual 2.1W Audio Amplifier Plus
No Coupling Capacitor Stereo Headphone Function
General Description
The LM4868 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.1W
to a 4鈩?load (Note 1) or 2.4W to a 3鈩?load (Note 2) with less
than 1.0% THD+N. The LM4868 uses advanced, latest gen-
eration circuitry to eliminate all traces of clicks and pops
when the supply voltage is first applied. The amplifier has a
headphone-amplifier-select input pin. It is used to switch the
amplifiers from bridge to single-ended mode for driving
headphones. A new circuit topology eliminates headphone
output coupling capacitors (patent pending). A MUX control
pin allows selection between the two sets of stereo input
signals. The MUX control can also be used to select be-
tween two different customer-specified closed-loop re-
sponses.
Boomer audio power amplifiers are designed specifically to
provide high quality output power from a surface mount
package and require few external components. To simplify
audio system design, the LM4868 combines dual bridge
speaker amplifiers and stereo headphone amplifiers in one
package.
The LM4868 features an externally controlled power-saving
micropower shutdown mode, a stereo headphone amplifier
mode, and thermal shutdown protection.
Note 1:
An LM4868LQ or LM4868MTE that has been properly mounted to
a circuit board will deliver 2.1W into 4鈩? The Mux control can also be used to
select two different closed-loop responses. LM4868MT will deliver 1.1W into
8鈩? See the Application Information sections for further information concern-
ing the LM4868LQ and the LM4868MT.
Note 2:
An LM4868LQ or LM4868MTE that has been properly mounted to a
circuit board and forced-air cooled will deliver 2.4W into 3鈩?
Key Specifications
n
P
O
at 1% THD+N
n
LM4868LQ, 3鈩?load
2.4W (typ)
n
LM4868LQ, 4鈩?load
2.1W (typ)
n
LM4868MTE, 4鈩?/div>
1.9W (typ)
n
LM4868MT, 8鈩?/div>
1.1W (typ)
n
Single-ended mode - THD+N at 75mW into 32鈩?/div>
0.5%
(max)
n
Shutdown current
0.7碌A(chǔ) (typ)
Features
n
Advanced 鈥渃lick and pop鈥?suppression circuitry
n
Eliminates headphone amplifier output coupling
capacitors (patent pending)
n
Stereo headphone amplifier mode
n
Input mux control and two separate inputs per channel
n
Thermal shutdown protection circuitry
n
LLP, TSSOP, and exposed-DAP TSSOP packaging
available
Applications
n
Multimedia monitors
n
Portable and desktop computers
n
Portable audio systems
Connection Diagrams
20026758
Top View
Order Number LM4868MT, LM4868MTE
See NS Package Number MTC20 for TSSOP
See NS Package Number MXA20A for Exposed-DAP TSSOP
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200267
www.national.com

LM4868LQ 產(chǎn)品屬性

  • 1

  • 集成電路 (IC)

  • 線性 - 音頻放大器

  • Boomer®

  • AB 類

  • 2-通道（立體聲）帶立體聲耳機(jī)

  • 3W x 2 @ 3 歐姆; 208mW x 2 @ 16 歐姆

  • 2 V ~ 5.5 V

  • 消除爆音，輸入多路復(fù)用器，關(guān)機(jī)，熱保護(hù)

  • 表面貼裝

  • 24-LLP-EP（4x5）

  • 24-WFQFN 裸露焊盤

  • 剪切帶 (CT)

  • *LM4868LQLM4868LQCT

LM4868LQ相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
    下載
  • 英文版
    National Semiconductor [1W Stereo Audio Amplifier Plus Adju...
    NSC
  • 英文版
    Low Voltage High Power Audio Power Amplifier
    NSC
  • 英文版
    Low Voltage High Power Audio Power Amplifier
    NATIONAL SEMICONDUCTOR
  • 英文版
    3V, 1W Boosted Boomer
    NSC
  • 英文版
    Low Voltage High Power Audio Power Ampliier
    NATIONAL SEMICONDUCTOR
  • 英文版
    Dual 105 mW Headphone Amplifier
    NSC
  • 英文版
    LM4808 Dual 105 mW Headphone Amplifier
    NATIONAL SEMICONDUCTOR
  • 英文版
    Dual 105mW Headphone Amplifier with Active-Low Shutdown Mode
    NSC
  • 英文版
    LM4809 Dual 105mW Headphone Amplifier with Active-Low Shutdo...
    NATIONAL
  • 英文版
    Dual 105mW Headphone Amplifier with Active-High Shutdown Mod...
    NSC
  • 英文版
    LM4810 Dual 105mW Headphone Amplifier with Active-High Shutd...
    NATIONAL
  • 英文版
    Dual 105mW Headphone Amplifier with Digital Volume
    NSC
  • 英文版
    Dual 105mW Headphone Amplifier
  • 英文版
    National Semiconductor [1W Stereo Audio Amplifier + Adjusta...
    NSC
  • 英文版
    1W Stereo Audio Amplifier Plus Adjustable Output Limiter Plu...
    NSC
  • 英文版
    1W Stereo Audio Amplifier Plus Adjustable Output Limiter Plu...
    NATIONAL
  • 英文版
    350mW Audio Power Amplifier with Shutdown Mode
    NSC
  • 英文版
    350mW Audio Power Amplifier with Shutdown Mode
    NATIONAL
  • 英文版
    350mW Audio Power Amplifier with Shutdown Mode
    NSC
  • 英文版
    350mW Audio Power Amplifier with Shutdown Mode
    NATIONAL

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