AD51653-4.2W Mono Class-K Audio Amplifier  DataSheet

Description
The AD51653 is a mono, class-D audio amplifier
with a built-in, adaptive charge pump circuit for
better system power efficiency. Due to its design,
AD51653 can provide a constant 3W peak output
power with 4ohm speaker at 4.2V of battery output
voltage. When the amplitude of the input audio
signal is below a threshold, AD51653 operates in
power-saving mode, which disables the
charge-pump circuit to save power, and the amplifier
is directly powered by the battery. When the
amplitude of the audio signal exceeds the threshold
level, AD51653 enables the charge-pump circuit to
generate a regulated, 2xVDD (input power) power
supply up to 6.5V, to drive the amplifier. Since most
of time the audio signal is below the threshold level,
this feature prolongs the battery life effectively
without sacrificing the output quality.
The non-crack-noise (NCN) function is enabled to
prevent output signal from distortion when the input
signal exceeds a threshold level. All these functions
are performed automatically. AD51653 features four
control modes, controlled by a one-wire pulse signal,
to achieve different NCN mode setting.
The output short circuit and over temperature
protections provide auto-recovery feature. AD51653
is available in TQFN 4x4-28L, TQFN3x3-20L,
E-TSSOP-14L and WLCSP-12L packages.

Features
z Supply voltage range: 2.8 V to 5.5 V
z Static operation current: 3.5mA
z Shutdown current: <1uA
z Loudspeaker peak power from 5V supply:
„ 4.2W @ 4Ω, Po,10% THD+N
„ 3.5W @ 4Ω, Po,1% THD+N
z Loudspeaker peak power from 4.2V supply:
„ 3W @ 4Ω, Po,10% THD+N
„ 2.6W @ 4Ω, Po,1% THD+N
„ 2.9W @ 8Ω, Po,10% THD+N
„ 2.3W @ 8Ω, Po,1% THD+N
z Gain setting: 27.5dB
z Integrated adaptive charge-pump circuit
z Non-Crack-Noise (NCN) Function
z Pop noise and click noise reduction
z Under-Voltage detection
z Short-Circuit protection with auto recovery
z Over temperature protection with auto recovery

Applications
z Portable Multimedia Devices
z Mobile Phones
z GPS
z Handsets