The LPA4732 stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The LPA4732 deliver up to 215mW per channel into a 16Ω load or 194mW into a 32Ω load and have low 0.003% THD+N. An 78dB at 217Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. Comprehensive anticlick-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. A low-power shutdown mode reduces the supply current to 0.1µA. The LPA4732 operates from a single 2.5V to 5.5V supply, consumes only 5mA supply current, and is specified over the extended -40 ℃ to +85 ℃ temperature range. The devices are available in tiny 16-pin TQFN (3mm✕ 3mm✕0.8mm) packages.

Applications

 MP3 Players

 Smart/Cellular Phones

 PDAs

 Portable Audio

 Notebook and Desktop PCs

 Flat-Panel Monitor

Features

 2.5V to 5.5V Single-Supply Operation

 No Bulky DC-Blocking Capacitors Required

 No Degradation of Low-Frequency Response Due to Output Capacitors

 Differential Inputs for Enhanced Noise Cancellation

 194mW into 32Ω Load from 5V Power Supply at THD+N = 0.1% (TYP, per Channel)

 Low 0.003% THD+N

 High PSRR (-78dB at 217Hz)

 Short-Circuit and Thermal-Overload Protection

 Integrated Click-and-Pop Suppression

 Low Quiescent Current (3mA at VDD = 5V)

 Enable Control

 Under-Voltage Lockout Function

 -40℃ to +85℃ Operating Temperature Range

 Available in a Space-Saving 16-Pin TQFN (3mm✕ 3mm✕ 0.8mm) Package