LM4839 Datasheet, PDF (1/34 Pages) National Semiconductor (TI) – Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux

April 2002
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 4Ω (Note 1) with less than
1.0% THD+N, or 2.2W into 3Ω (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 4Ω. The LM4839MT will deliver 1.1W into
8Ω. 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 3Ω.
Key Specifications
n P_O at 1% THD+N
n into 3Ω (LQ & MTE)
n into 4Ω (LQ & MTE)
n into 8Ω (LM4839) (MT, MTE, & LQ)
n Single-ended mode - THD+N at 85mW into
32Ω
n Shutdown current
2.2W(typ)
2.0W(typ)
1.1W(typ)
1.0%(typ)
0.2µA(typ)
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
Connection Diagrams
LLP Package
DS200134-83
Top View
Order Number LM4839LQ
See NS Package Number LQA028AA for Exposed-DAP LLP
Boomer^® is a registered trademark of NationalSemiconductor Corporation.
© 2002 National Semiconductor Corporation DS200134
www.national.com