300 mA Ultra-Low noise, Ultra-Fast CMOS LDO Regulator

FEATURES 
 Ultra-low Noise for RF Application 
 Ultra-Fast Response in Line/Load Transient  <0.01µA Standby Current When Shutdown. 
 Low Dropout:210mV@300mA 
 Wide Operating Voltage Ranges:2V to 6V 
 TTL-logic-Controlled Shutdown Input 
 Low Temperature Coefficient 
 Current Limiting Protection 
 Thermal Shutdown Protection 
 Only 1µF Output Capacitor Required for Stability 
 High Power Supply Rejection Ratio 
 Custom Voltage Available 
 Fast output discharge 
 Available in 5-Lead SOT-23 and SC-70 Package

APPLICATIONS 
 Cellular and Smart Phones 
 Battery-Powered Equipment 
 Laptop, Palmtops, Notebook Computers 

 Hand-Held Instruments 
 PCMCIA Cards 
 MP3/MP4/MP5 Players 
 Portable Information Appliances 

DESCRIPTION 
The BL9198 is designed for portable RF and wireless applications with demanding perfor- mance and space requirements. The BL9198 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. Regulator ground current  ncreases only slightly in dropout, further prolonging the battery life. The BL9198 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The BL9198 consumes less than 0.01µA in shutdown mode and has fast turn-on time less than 50µs. The other features include ultra low dropout voltage, high output  accuracy, current limiting protection, and high ripple rejection ratio. Available in the 5-lead SC-70 and SOT-23 packages.