Home Audio Audio amplifiers Speaker amps
Home
Audio
Audio amplifiers
Speaker amps

LM4938

ACTIVE

Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain

Order now
Data sheet

LM4938

ACTIVE
Data sheet Order now

Product details

Audio input type Analog Input Architecture Class-AB Speaker channels (max) Stereo Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.7 Load (min) (Ω) 3 Output power (W) 2.2 THD + N at 1 kHz (%) 0.05 Iq (typ) (mA) 11 Control interface GPIO Closed/open loop Open Analog supply (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 PSRR (dB) 78 Operating temperature range (°C) -20 to 85
Audio input type Analog Input Architecture Class-AB Speaker channels (max) Stereo Rating Catalog Power stage supply (max) (V) 5.5 Power stage supply (min) (V) 2.7 Load (min) (Ω) 3 Output power (W) 2.2 THD + N at 1 kHz (%) 0.05 Iq (typ) (mA) 11 Control interface GPIO Closed/open loop Open Analog supply (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 PSRR (dB) 78 Operating temperature range (°C) -20 to 85
HTSSOP (PWP) 28 62.08 mm² 9.7 x 6.4
  • Improved Click and Pop Circuitry Virtually Eliminates Noise During Turn On/Off Transitions
  • DC Volume Control Interface
  • System Beep Detect
  • Stereo Switchable Bridged/Single-Ended Power Amplifiers
  • Selectable Internal/External Gain and Bass Boost
  • Thermal Shutdown Protection Circuitry
  • Unity Gain Stable

Key Specifications

  • PO at 1% THD+N
    • into 3Ω: 2.2W (typ)
    • into 4Ω: 2.0W (typ)
    • into 8Ω: 1.3W (typ)
  • Single-ended mode
    • THD+N at 92mW into 32Ω: 1.0% (typ)
  • Shutdown Current: 0.5µA (typ)

All trademarks are the property of their respective owners.

  • Improved Click and Pop Circuitry Virtually Eliminates Noise During Turn On/Off Transitions
  • DC Volume Control Interface
  • System Beep Detect
  • Stereo Switchable Bridged/Single-Ended Power Amplifiers
  • Selectable Internal/External Gain and Bass Boost
  • Thermal Shutdown Protection Circuitry
  • Unity Gain Stable

Key Specifications

  • PO at 1% THD+N
    • into 3Ω: 2.2W (typ)
    • into 4Ω: 2.0W (typ)
    • into 8Ω: 1.3W (typ)
  • Single-ended mode
    • THD+N at 92mW into 32Ω: 1.0% (typ)
  • Shutdown Current: 0.5µA (typ)

All trademarks are the property of their respective owners.

The LM4938 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.

Boomer audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4938 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 LM4938 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, LM4938MH will deliver 2W into 4Ω. See Application Information section for more information.

Note 2: An LM4938MH that has been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3Ω.

The LM4938 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.

Boomer audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4938 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 LM4938 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, LM4938MH will deliver 2W into 4Ω. See Application Information section for more information.

Note 2: An LM4938MH that has been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3Ω.
filter Find other Speaker amps
Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Data sheet LM4938 Stereo 2W Audio Pwr Amp w/DC Vol Cntrl & Selectable Gain datasheet (Rev. B) 01 May 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Request
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 28 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos