LM4938 Series

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

Catalog

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

Part	Max Output Power x Channels @ Load	Output Type	Supplier Device Package	Voltage - Supply [Min]	Voltage - Supply [Max]	Type	Package / Case [custom]	Package / Case	Package / Case [custom]	Features	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]
Texas Instruments LM4938MH/NOPB	2.2 W 92 mW	2-Channel (Stereo) with Stereo Headphones	28-HTSSOP	2.7 V	5.5 V	Class AB	4.4 mm	28-PowerTSSOP	0.173 "	Bass Boost Depop Mute Shutdown Thermal Protection Volume Control	Surface Mount	-20 °C	85 C

Catalog

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

Key Features

• Improved Click and Pop Circuitry Virtually Eliminates Noise During Turn On/Off TransitionsDC Volume Control InterfaceSystem Beep DetectStereo Switchable Bridged/Single-Ended Power AmplifiersSelectable Internal/External Gain and Bass BoostThermal Shutdown Protection CircuitryUnity Gain StableKey SpecificationsPOat 1% THD+Ninto 3Ω: 2.2W (typ)into 4Ω: 2.0W (typ)into 8Ω: 1.3W (typ)Single-ended modeTHD+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 TransitionsDC Volume Control InterfaceSystem Beep DetectStereo Switchable Bridged/Single-Ended Power AmplifiersSelectable Internal/External Gain and Bass BoostThermal Shutdown Protection CircuitryUnity Gain StableKey SpecificationsPOat 1% THD+Ninto 3Ω: 2.2W (typ)into 4Ω: 2.0W (typ)into 8Ω: 1.3W (typ)Single-ended modeTHD+N at 92mW into 32Ω: 1.0% (typ)Shutdown Current: 0.5µA (typ)All trademarks are the property of their respective owners.

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, 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.