UNISONIC TECHNOLOGIES CO., LTD

PA4894

CMOS IC

www.unisonic.com.tw

1 of 11

Copyright © 2009 Unisonic Technologies Co., Ltd

QW-R502-379.A

1.8 WATT DIFFERENTIAL

AUDIO POWER AMPLIFIER

WITH SELECTABLE

SHUTDOWN

DESCRIPTION

The UTC PA4894 is a differential audio power amplifier,

characterized by its selectable shutdown mode for flexible operation.

Shutdown may be enabled by either logic high or low depending on

the voltage applied on the SD MODE pin and the shutdown mode

features low power consumption.

This device provides customers perfect sound performance by

its high quality audio, moreover, less external components and lower

power dissipation are required.

Operating with a 5.5V power supply, the UTC PA4894 is

capable of driving an 8.0Ω load at a continuous average output of

1.8W under a 10% THD+N. If it works with a 5.0V voltage under the

same load conditions, 1.0W power will be delivered and the

distortion will be less than 0.01%.

The UTC PA4894 incorporates protection circuit to avoid the

click and pop noise, which may occur during the transition state

between turn-on and turn-off.

The UTC PA4894 can be directly connected to a battery without

an LDO since it has perfect PSRR. The UTC PA4894 can be

configured externally with resistors to provide a controlled gain and

with bypass capacitor to provide a controlled turn-on time for more

flexibility.

The UTC PA4894 is suitable for applications, such as portable

electronic devices, PDAs and mobile phones.

MSOP-10

FEATURES

* Differential amplification

* Selectable and low current shutdown

mode

* 1.0W/Ch(typ.)into a 8Ω load @5.0V

* Directly connected to the battery due to

excellent PSRR

* Operation supply: 2.2 V-5.5 V

* External controlled gain and turn-on

time configuration

* Circuits for protection

* Thermal overload protection circuit

* “Click and pop” noise protection circuit

* Halogen Free

ORDERING INFORMATION

Ordering Number

Package

Packing

PA4894G-SM2-R

MSOP-10

Tape Reel