LM4809LQX Datasheet, PDF (1/30 Pages) Texas Instruments – Dual 105mW Headphone Amplifier with Active- Low Shutdown Mode

LM4809, LM4809LQBD
www.ti.com
SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013
LM4809
Dual 105mW Headphone Amplifier with Active-
Low Shutdown Mode
Check for Samples: LM4809, LM4809LQBD
FEATURES
1
•2 Active-Low Shutdown Mode
• "Click and Pop" Reduction Circuitry
• Low Shutdown Current
• WSON, MSOP, and SOIC Surface Mount
Packaging
• No Bootstrap Capacitors Required
• Unity-Gain Stable
APPLICATIONS
• Headphone Amplifier
• Personal Computers
• Microphone Preamplifier
• PDA's
KEY SPECIFICATIONS
• THD+N at 1kHz at 105mW Continuous Average
Power into 16Ω 0.1% (typ)
• THD+N at 1kHz at 70mW Continuous Average
Power into 32Ω 0.1% (typ)
• Shutdown Current 0.4µA (typ)
DESCRIPTION
The LM4809 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
LM4809 does not require bootstrap capacitors or
snubber networks, it is optimally suited for low-power
portable systems.
The unity-gain stable LM4809 can be configured by
external gain-setting resistors.
The LM4809 features an externally controlled, active-
low, micropower consumption shutdown mode, as
well as an internal thermal shutdown protection
mechanism.
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2013, Texas Instruments Incorporated