SNAS131F – JANUARY 2001 – REVISED MARCH 2013
Stereo 2W Audio Power Amplifiers
with DC Volume Control and Selectable Gain
Check for Samples: LM4838
•23 DC Volume Control Interface
• System Beep Detect
• Stereo Switchable Bridged/Single-Ended
• Selectable Internal/External Gain and Bass
• “Click and Pop” Suppression Circuitry
• Thermal Shutdown Protection Circuitry
• Portable and Desktop Computers
• Multimedia Monitors
• Portable Radios, PDAs, and Portable TVs
The LM4838 is a monolithic integrated circuit that
provides DC volume control, and stereo bridged
audio power amplifiers capable of producing 2W into
4Ω with less than 1.0% THD or 2.2W into 3Ω with
less than 1.0% THD (see Notes below).
Boomer™ audio integrated circuits were designed
specifically to provide high quality audio while
requiring a minimum amount of external components.
The LM4838 incorporates a DC volume control,
stereo bridged audio power amplifiers and a
selectable gain or bass boost, making it optimally
suited for multimedia monitors, portable radios,
desktop, and portable computer applications.
The LM4838 features an externally controlled, low-
power consumption shutdown mode, and both a
power amplifier and headphone mute for maximum
system flexibility and performance.
Note: When properly mounted to the circuit board,
the LM4838NJB, LM4838PWP, and LM4838NYC will
deliver 2W into 4Ω. The LM4838PW and LM4838YZR
will deliver 1.1W into 8Ω. See Application Information
section Exposed-DAP package PCB Mounting
Considerations for more information.
Note: An LM4838NJB and LM4838PWP that have
been properly mounted to the circuit board and
forced-air cooled will deliver 2.2W into 3Ω.
Table 1. Key Specifications
PO at 1% THD+N
Single-ended mode - THD+N at 85mW into 32Ω
into 3Ω (NJB & PWP)
into 4Ω (NJB, PWP, NYC)
into 8Ω (PW, PWP, YZR, NJB, & NYC)
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.
Boomer is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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