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.
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
