General Description
The AAT3221 and AAT3222 PowerLinear NanoPower low dropout (LDO) linear regulators are ideal for portable applications where extended battery life is critical. These devices feature extremely low quiescent current, typically 1.1µA. Dropout voltage is also very low, typically less than 200mV at the maximum output current of 150mA. The AAT3221/2 have an enable pin feature which, when asserted, will enter the LDO regulator into shutdown mode, removing power from its load and offering extended power conservation capabilities for portable battery-powered applications.

Features
• 1.1µA Quiescent Current
• Low Dropout: 200mV (typical)
• Guaranteed 150mA Output
• High Accuracy: ±2%
• Current Limit Protection
• Over-Temperature Protection
• Extremely Low Power Shutdown Mode
• Low Temperature Coefficient
• Factory-Programmed Output Voltages
    — 1.6V to 3.5V
• Stable Operation With Virtually Any Output Capacitor Type
• Active High or Low Enable Pin
• 4kV ESD
• 5-Pin SOT23 or 8-Pin SC70JW Package
• -40°C to +85°C Temperature Range

Applications
• Cellular Phones
• Digital Cameras
• Handheld Electronics
• Notebook Computers
• PDAs
• Portable Communication Devices
• Remote Controls