General Description
The APL5501/2/3 is micropower, low noise, low dropout linear regulator. Operate from 2.7V to 6V input voltage and deliver up to 500mA. Typical output noise is just 50mVRMS with the addition of an external 0.1mF bypass capacitor in BP pin and typical dropout voltage is only 170mV at 500mA loading . Designed for use in battery-powered system, the low 50uA quiescent current makes it an ideal choice.
Design with an internal P-channel MOSFET pass transistor, the APL5501/2/3 maintains a low supply current, independent of the load current and dropout voltage. Other features include reverse current protection, thermal-shutdown protection, current limit protection to ensure specified output current and controlled short-circuit current. The APL5501/2/3 regulator comes in a miniature SOT-23-5, SOT-89, SOT- 89-5, SOT-223, SO-8, TO-252 and TO-252-5 packages.

Features
• Low Noise : 50mVRMS (100Hz to 100kHz)
• Low Quiescent Current : 50mA (No load)
• Low Dropout Voltage : 170mV (@500mA)
• Very low Shutdown Current : < 0.5uA
• Fixed Output Voltage : 1.3V ~ 3.4V
• Stable with 4.7uF Output Capacitor
• Stable with Aluminum, Tantalum or Ceramic Capacitors
• Reverse Current Protection
• No Protection Diodes Needed
• Built in Thermal Protection
• Built in Current Limit Protection
• Controlled Short Circuit Current : 150mA
• Fast Transient Response
• Short Setting Time
• SOT-23-5, SOT-89, SOT-89-5, SOT-223, SO-8,
   TO-252 and TO-252-5 Packages
• Lead FreeAvailable (RoHS Compliant)

Applications
• Notebook Computer
• PDA or Portable Equipments
• Noise-Sensitive Instrumentation Systems