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LPA4722-Class AB Amplifiers

产品型号	输入电压(V)	类型	输出功率(W)	输出通道	PSRR(dB)	增益控制	短路保护	关断电流(uA)	封装	规格书
LPA4722	2.5-5.5	Class AB	215mW*2,5V@16Ω,0.1%	2	-100	X	X	2	TQFN-16

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.

Applications

 MP3 Players

 Smart/Cellular Phones

 PDAs

 Portable Audio

 Notebook and Desktop PCs

 Flat-Panel Monitors

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

Marking Information

Please see specification.

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