LM4873 Dual 2.1W Audio Amplifier Plus Stereo Headphone Function

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4873MTEX/NOPB LM4873MTEX		TSSOP EXP PAD	20	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM4873 MTE

Description

The LM4873 is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.1W to a 4 load or 2.4W to a 3 load with less than 1.0% THD+N. In addition, the headphone input pin allows the amplifiers to operate in single-ended mode when driving stereo headphones. A MUX control pin allows selection between the two stereo sets of amplifier inputs. The MUX control can also be used to select two different closed-loop responses.

Boomer audio power amplifiers were designed specifically to provide high quality output power from a surface mount package while requiring few external components. To simplify audio system design, the LM4873 combines dual bridge speaker amplifiers and stereo headphone amplifiers on one chip.

The LM4873 features an externally controlled, low-power consumption shutdown mode, a stereo headphone amplifier mode, and thermal shutdown protection. It also utilizes circuitry to reduce "clicks and pops" during device turn-on.

Features

Key Specification

PO at 1% THD+N
LM4873LQ, 3, 4 loads	2.4W(typ), 2.1W(typ)
LM4873MTE-1, 3, 4 loads	2.4W(typ), 2.1W(typ)
LM4873IBL, 8 load	1.1W(typ)
LM4873MTE, 4	1.9W(typ)
LM4873, 8	1.1W(typ)
Single-ended mode THD+N at 75mW into 32	0.5%(max)
Shutdown current	0.7µA(typ)
Supply voltage range	2V to 5.5V

Applications