AIC1748的特性及應(yīng)用
Ultra Low Noise, High PSRR, 600mA Linear Regulator With Bypass Pin

FEATURES
Guarantee 600mA Output Current.
Fast Response in Line/Load Transient.
Wide Operating Voltage Ranges: 2.3V to 6.0V.
<0.01?A Shutdown Standby Current.
Low Quiescent Current?<100?A.
Fixed: 0.8V, 1.2V, 1.8V, 2.5V, 2.85V, 3.3V Output Voltage.
Adjustable Output Voltage are available from 0.8~4.5V.
Low Dropout?350mV at 600mA load current and 3.3V output voltage.
High PSRR?65dB at 1kHz.
Active Low or High Shutdown Control.
Current Limit, Current Foldback and Thermal Protection.
Available in ∮2% Output Tolerance.
Available in 3 & 5 lead of SOT23, SOT89, TO252 & 3 lead of SOT223 Package.

APPLICATIONS
Cellular Phones
PCMCIA Cards
Laptop, Palmtops, Notebook Computers
Personal Communication Equipment
PDAs
Digital Still Cameras
Portable Consumer Equipments
DESCRIPTION
A low noise, high PSRR and ultra low dropout linear regulator AIC1748 is optimized for low ESR ceramic capacitors operation with 600mA continuous current. The AIC1748 is designed for portable and wireless devices with demanding performance and space requirements.

The AIC1748 offers high precision output voltage of 刡2% tolerance. Output voltage can also be available on demand for those other than the preset values.

A noise bypass pin is available for further reduction of output noise. At 600mA load current and 3.3V output voltage, a 350mV dropout is performed. The quality of low quiescent current and low dropout voltage makes this device ideal for battery power applications. The high ripple rejection and low noise of the AIC1748 provide enhanced performances for critical applications such as cellular phones, and PDAs.

In addition, a logic-level shutdown input is included, which reduce supply current to less than 0.01?A (typ.) in shutdown mode with fast turn-on & off time less than 50?s & 30?s. The AIC1748ˇs current limit and thermal protection provide protection against any overload condition that would create excessive junction temperatures.

?AIC1748 datasheet,pdf