LM4936 Datasheet, PDF (1/28 Pages) National Semiconductor (TI) – Stereo 2W Audio Power Amplifiers with Volume Control and Selectable Control Interface (SPI or I2C)

April 2005
LM4936
Stereo 2W Audio Power Amplifiers with Volume Control
and Selectable Control Interface (SPI or I²C)
General Description
The LM4936 is a monolithic integrated circuit that provides
volume control, and stereo bridged audio power amplifiers
capable of producing 2W into 4Ω (Note 1) with less than 1%
THD or 2.2W into 3Ω (Note 2) with less than 1% THD.
Boomer^® audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4936 incorporates a
SPI or I²C Control Interface that runs the volume control,
stereo bridged audio power amplifiers and a selectable gain
or bass boost. All of the LM4936’s features (i.e. SD, Mode,
Mute, Gain Sel) make it optimally suited for multimedia
monitors, portable radios, desktop, and portable computer
applications.
The LM4936 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, LM4936MH will deliver
2W into 4Ω. See Application Information section Exposed-DAP package
PCB Mounting Considerations for more information.
Note 2: An LM4936MH that 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
n into 3Ω
2.2W (typ)
n into 4Ω
2.0W (typ)
n into 8Ω
1.25W (typ)
n Single-ended mode - THD+N at 90mW into 32Ω 1%(typ)
n Shutdown current
0.7µA (typ)
Features
n Selectable SPI or I²C Control Interface
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
n Headphone Sense
Applications
n Portable and Desktop Computers
n Multimedia Monitors
n Portable Radios, PDAs, and Portable TVs
Connection Diagram
TSSOP Package
20117802
Top View
Order Number LM4936MH
See NS Package Number MXA28A for Exposed-DAP TSSOP
Boomer^® is a registered trademark of NationalSemiconductor Corporation.
© 2005 National Semiconductor Corporation DS201178
www.national.com