LOWPOWER LP3981-18B5F

The LP3981 is designed for portable RF and wireless applications demanding performance and space requirements. The LP3981 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The LP3981 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The LP3981 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. It is available in 5-lead of SOT23-5 packages.

• Ultra-Low-Noise for RF Application
• 2V - 6.5V Input Voltage Range
• Low Dropout: 220mV @ 300mA
• 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V and 3.3V Fixed
• 300mA Output Current, 550mA Peak Current
• High PSSR: -76dB at 1KHz
• <0.01uA Standby Current When Shutdown
• Available in SOT23-5 Package
• TTL-Logic-Controlled Shutdown Input
• Ultra-Fast Response in Line/Load transient
• Current Limiting and Thermal Shutdown Protection
• Quick start-up (typically 50uS)

• Portable Media Players/MP3 players
• Cellular and Smart mobile phone
• LCD
• DSC Sensor
• Wireless Card