LPA4722AQVF

The LPA4722A stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The LPA4722A deliver up to 215mW per channel into a 16Ω load or 200mW into a 32Ω load and have low 0.005% 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 LPA4722A 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

Key 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 0.008% THD+N
• Short-Circuit and Thermal-Overload Protection
• Integrated Click-and-Pop Suppression
• Low Quiescent Current (3mA at VDD = 5V)
• Shutdown Control
• Under-Voltage Lockout Function
• -40°C to +85°C Operating Temperature Range
• Available in a Space-Saving 16-Pin TQFN (3mm×3mm×0.8mm) Package