LM4809_14 Datasheet, PDF (1/30 Pages) Texas Instruments – Dual 105mW Headphone Amplifier with Active- Low Shutdown Mode

LM4809, LM4809LQBD
www.ti.com
SNAS126E – MAY 2004 – REVISED MAY 2004
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
• LLP, MSOP, and SO surface mount packaging
• No bootstrap capacitors required
• Unity-gain stable
APPLICATIONS
• Headphone Amplifier
• Personal Computers
• Microphone Preamplifier
• PDA's
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.
Table 1. Key Specifications
THD+N at 1kHz at 105mW continuous average power into 16Ω
THD+N at 1kHz at 70mW continuous average power into 32Ω
Shutdown Current
VALUE
0.1% (typ)
0.1% (typ)
0.4µA (typ)
UNIT
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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 © 2004, Texas Instruments Incorporated