LM4836 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux

PRELIMINARY
June 1999
LM4836
Stereo 2W Audio Power Amplifiers
with DC Volume Control, Bass Boost, and Input Mux
General Description
The LM4836 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 LM4836 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 LM4836 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 LM4836MTE will
deliver 2W into 4Ω. The LM4836MT will deliver 1.1W into 8Ω. See the Appli-
cation Information section for LM4836MTE usage information.
Note 2: An LM4836MTE which has 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
into 3Ω (LM4836MTE)
into 4Ω (LM4836MTE)
into 8Ω (LM4836)
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 PC98 and PC99 Compliant
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
configurable
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 Diagram
TSSOP Package
DS101088-2
Top View
Order Number LM4836MT
See NS Package Number MTC28 for TSSOP
Order Number LM4836MTE
See NS Package Number MXA28A for Exposed DAP TSSOP
Boomer^® is a registered trademark of NationalSemiconductor Corporation.
© 1999 National Semiconductor Corporation DS101088
www.national.com