LM4946 Series

540-mW, mono, 35-mW stereo, analog input Class-AB audio amplifier with I2C interface

Catalog

540-mW, mono, 35-mW stereo, analog input Class-AB audio amplifier with I2C interface

Part	Features	Mounting Type	Supplier Device Package	Type	Voltage - Supply [Min]	Voltage - Supply [Max]	Max Output Power x Channels @ Load	Output Type	Package / Case	Operating Temperature [Max]	Operating Temperature [Min]
Texas Instruments LM4946SQ/NOPB	3D Depop I2C Mute Shutdown SPI Thermal Protection Volume Control	Surface Mount	24-WQFN (4x4)	Class D	2.7 V	5.5 V	1.3 W 85 mW	1-Channel (Mono) with Stereo Headphones	24-WFQFN Exposed Pad	85 °C	-40 °C
Texas Instruments LM4946SQX/NOPB	3D Depop I2C Mute Shutdown SPI Thermal Protection Volume Control	Surface Mount	24-WQFN (4x4)	Class D	2.7 V	5.5 V	1.3 W 85 mW	1-Channel (Mono) with Stereo Headphones	24-WFQFN Exposed Pad	85 °C	-40 °C

Catalog

540-mW, mono, 35-mW stereo, analog input Class-AB audio amplifier with I2C interface

Key Features

• I2C/SPI Control InterfaceI2C/SPI programmable National 3D AudioI2C/SPI controlled 32 step digital volume control (-54dB to +18dB)Three independent volume channels (Left, Right, Mono)Eight distinct output modesLLP and microSMD surface mount packaging"Click and Pop" suppression circuitryThermal shutdown protectionLow shutdown current (0.02uA, typ)RF immunity topologyI2C/SPI Control InterfaceI2C/SPI programmable National 3D AudioI2C/SPI controlled 32 step digital volume control (-54dB to +18dB)Three independent volume channels (Left, Right, Mono)Eight distinct output modesLLP and microSMD surface mount packaging"Click and Pop" suppression circuitryThermal shutdown protectionLow shutdown current (0.02uA, typ)RF immunity topology

Description

The LM4946 is an audio power amplifier capable of delivering 540mW of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N, 35mW per channel of continuous average power into stereo 32Ω single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specifications as the SE configuration, from a 3.3V power supply. The LM4946 has three input channels: one pair for a two-channel stereo signal and the third for a differential single-channel mono input. The LM4946 features a 32-step digital volume control and eight distinct output modes. The digital volume control, 3D enhancement, and output modes (mono/SE/OCL) are programmed through a two-wire I2C or a three-wire SPI compatible interface that allows flexibility in routing and mixing audio channels. The LM4946 is designed for cellular phone, PDA, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only seven external components in the OCL mode (two additional components in SE mode). The LM4946 is an audio power amplifier capable of delivering 540mW of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N, 35mW per channel of continuous average power into stereo 32Ω single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specifications as the SE configuration, from a 3.3V power supply. The LM4946 has three input channels: one pair for a two-channel stereo signal and the third for a differential single-channel mono input. The LM4946 features a 32-step digital volume control and eight distinct output modes. The digital volume control, 3D enhancement, and output modes (mono/SE/OCL) are programmed through a two-wire I2C or a three-wire SPI compatible interface that allows flexibility in routing and mixing audio channels. The LM4946 is designed for cellular phone, PDA, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only seven external components in the OCL mode (two additional components in SE mode).