Specification	LM4857SP/NOPB

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

LM4857 Series

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

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 3.24
	Digi-Reel®	1	$ 3.24
	Tape & Reel (TR)	1000	$ 1.71
		2000	$ 1.63
		5000	$ 1.57
Texas Instruments	LARGE T&R	1	$ 2.82
		100	$ 2.47
		250	$ 1.73
		1000	$ 1.39

Description

General part information

LM4857 Series

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.

Documents

Technical documentation and resources

LM4857 Stereo 1.2W Audio Sub-system with 3D Enhancement datasheet (Rev. I)

Data sheet