5V, Differential Input, DirectDrive, 215mW Stereo Headphone Amplifiers with Shutdown
LowPowerSemi's LPA4722 stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The LPA4722 delivers up to 215mW per channel into a 16Ω load or 200mW into a 32Ω load and has a low 0.01% THD+N. An 80dB at 217Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. Comprehensive anti-click-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 LPA4722 operates from a single 2.5V to 5.5V supply, consumes only a 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.
Features
2.5V to 5.5V Single-Supply Operation
High PSRR (80dB at 217Hz) Eliminates LDO
No Bulky DC-Blocking Capacitors Required
Ground-Referenced Outputs Eliminate DC Bias Voltage on Headphone Ground Pin
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
Short-Circuit and Thermal-Overload Protection
Integrated Click-and-Pop Suppression
Low Quiescent Current (5mA at VDD = 5V)
Shutdown Control
Under-Voltage Lockout Function
-40℃ to +85℃ Operating Temperature Range
Available in a Space-Saving 16-Pin TQFN (3mm ✕ 3mm ✕ 0.8mm) Package
Applications
MP3 Players
Smart/Cellular Phones
PDAs
Portable Audio
Notebook and Desktop PCs
Flat-Panel Monitors
Order Information
Typical Application Circuit
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