LM4938

具有 DC 音量控制和可选增益的立体声 2W 音频功率放大器 28-HTSSOP

The 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.

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Improved Click and Pop Circuitry Virtually Eliminates Noise During Turn On/Off Transitions

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DC Volume Control Interface

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System Beep Detect

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Stereo Switchable Bridged/Single-Ended Power Amplifiers

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Selectable Internal/External Gain and Bass Boost

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Thermal Shutdown Protection Circuitry

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Unity Gain Stable

## Key Specifications

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PO at 1% THD+N

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into 3Ω: 2.2W typ

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into 4Ω: 2.0W typ

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into 8Ω: 1.3W typ

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Single-ended mode

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THD+N at 92mW into 32Ω: 1.0% typ

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Shutdown Current: 0.5µA typ

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