LM4857 Series

1.2-W, stereo, analog input, Class-AB audio amplifier with 3D enhancement & 16 output modes

Catalog

1.2-W, stereo, analog input, Class-AB audio amplifier with 3D enhancement & 16 output modes

Part	Operating Temperature [Max]	Operating Temperature [Min]	Features	Voltage - Supply [Min]	Voltage - Supply [Max]	Supplier Device Package	Type	Mounting Type	Package / Case	Output Type	Max Output Power x Channels @ Load
Texas Instruments LM4857SP/NOPB	85 °C	-40 °C	3D Depop I2C Mute Shutdown Thermal Protection Volume Control	2.7 V	5.5 V	28-UQFN (5x5)	Class AB	Surface Mount	28-UFQFN Exposed Pad	2-Channel (Stereo) with Mono and Stereo Headphones	1.6 W 75 mW

Catalog

1.2-W, stereo, analog input, Class-AB audio amplifier with 3D enhancement & 16 output modes

Key Features

• Stereo Speaker AmplifierStereo Headphone AmplifierMono Earpiece AmplifierMono Line Output for External Handsfree CarkitIndependent Left, Right, and Mono Volume ControlsTI 3D EnhancementI2C Compatible InterfaceUltra low Shutdown CurrentClick and Pop Suppression Circuit16 distinct Output ModesThermal Shutdown ProtectionAvailable in DSBGA and UQFN packagesKey SpecificationsPOUT, Stereo Loudspeakers, 4Ω, 5V, 1% THD+N (LM4857SP) 1.6W (typ)POUT, Stereo Loudspeakers, 8Ω, 5V, 1% THD+N 1.2W (typ)POUT, Stereo Headphones, 32Ω, 5V, 1% THD+N 75mW (typ)POUT, Mono Earpiece, 32Ω, 5V, 1% THD+N 100mW (typ)POUT, Stereo Loudspeakers, 8Ω, 3.3V, 1% THD+N 495mW (typ)POUT, Stereo Headphones, 32Ω, 3.3V, 1% THD+N 33mW (typ)POUT, Mono Earpiece, 32Ω, 3.3V, 1% THD+N 43mW (typ)Shutdown Current 0.06μA (typ)All trademarks are the property of their respective owners.Stereo Speaker AmplifierStereo Headphone AmplifierMono Earpiece AmplifierMono Line Output for External Handsfree CarkitIndependent Left, Right, and Mono Volume ControlsTI 3D EnhancementI2C Compatible InterfaceUltra low Shutdown CurrentClick and Pop Suppression Circuit16 distinct Output ModesThermal Shutdown ProtectionAvailable in DSBGA and UQFN packagesKey SpecificationsPOUT, Stereo Loudspeakers, 4Ω, 5V, 1% THD+N (LM4857SP) 1.6W (typ)POUT, Stereo Loudspeakers, 8Ω, 5V, 1% THD+N 1.2W (typ)POUT, Stereo Headphones, 32Ω, 5V, 1% THD+N 75mW (typ)POUT, Mono Earpiece, 32Ω, 5V, 1% THD+N 100mW (typ)POUT, Stereo Loudspeakers, 8Ω, 3.3V, 1% THD+N 495mW (typ)POUT, Stereo Headphones, 32Ω, 3.3V, 1% THD+N 33mW (typ)POUT, Mono Earpiece, 32Ω, 3.3V, 1% THD+N 43mW (typ)Shutdown Current 0.06μA (typ)All trademarks are the property of their respective owners.

Description

The LM4857 is an integrated audio sub-system designed for stereo cell phone applications. Operating on a 3.3V supply, it combines a stereo speaker amplifier delivering 495mW per channel into an 8Ω load, a stereo headphone amplifier delivering 33mW per channel into a 32Ω load, a mono earpiece amplifier delivering 43mW into a 32Ω load, and a line output for an external powered handsfree speaker. It integrates the audio amplifiers, volume control, mixer, power management control, and TI 3D enhancement all into a single package. In addition, the LM4857 routes and mixes the stereo and mono inputs into 16 distinct output modes. The LM4857 is controlled through an I2C compatible interface. Other features include an ultra-low current shutdown mode and thermal shutdown protection. Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components. The LM4857 is available in a 30-bump DSBGA package and a 28–lead UQFN package. The LM4857 is an integrated audio sub-system designed for stereo cell phone applications. Operating on a 3.3V supply, it combines a stereo speaker amplifier delivering 495mW per channel into an 8Ω load, a stereo headphone amplifier delivering 33mW per channel into a 32Ω load, a mono earpiece amplifier delivering 43mW into a 32Ω load, and a line output for an external powered handsfree speaker. It integrates the audio amplifiers, volume control, mixer, power management control, and TI 3D enhancement all into a single package. In addition, the LM4857 routes and mixes the stereo and mono inputs into 16 distinct output modes. The LM4857 is controlled through an I2C compatible interface. Other features include an ultra-low current shutdown mode and thermal shutdown protection. Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components. The LM4857 is available in a 30-bump DSBGA package and a 28–lead UQFN package.