Class AB Amplifiers

LPA4722-Class AB Amplifiers
2.5-5.5Input Voltage(V):
Class ABClass:
215mW*2,5V@16Ω,0.1%Output Power(W):
2Output Channel:
XGain Control:
XShort Circuit Protection:
2Terminal Current(uA):

5V, Differential Input, DirectDrive, 215mW
Stereo Headphone Amplifiers with Shutdown

General Description

The LPA4722 stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The LPA4722 deliver up to 215mW per channel into a 16Ω load or 200mW into a 32Ω load and have 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 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 LPA4722 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.


 MP3 Players
 Smart/Cellular Phones
 PDAs
 Portable Audio
 Notebook and Desktop PCs
 Flat-Panel Monitors



 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


Marking Information

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