Stereo 2W Audio Power Amplifiers - Texas Instruments
Description
LM4938
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ti.
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SNAS245B – FEBRUARY 2005 – REVISED MAY 2013
LM4938 Boomer™ Audio Power Amplifier Series Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain
Check for Samples: LM4938
FEATURES
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•23 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
APPLICATIONS
• Flat Panel Displays • Portable and Desktop Computers • Multimedia Monitors • Portable Radios, PDAs, and Portable TVs
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)
DESCRIPTION
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, lowpower 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 HTSSOP PACKAGE PCB MOUNTING CONSIDERATIONS 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.
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Please be aware that an important notice...
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