General Description
The APL5551 is a dual-channel regulator with reset function (specific voltage monitoring), and internal delay circuit, set to detect 3.9V. Maximum input voltage is 6V, and both output1 and output2 can deliver up to 450mA. The typical dropout voltage of both channel is 500mV at 500mA loading. Design with an internal P-channel MOSFET pass transistor, the APL5551 maintains a low supply current. Other features include, thermal-shutdown protection, current limit protection to ensure specified output current. The APL5551 comes in miniature SOP-8 and SOP-8-P packages.

Features
• Low Quiescent Current : 110mA (No load)
• LowDropout Voltage :
   VDROP1 = 450mV @ 500mA
   VDROP2= 500mV @ 500mA
• Fixed Output Voltage :
   VOUT1 = 3.3V/500mA
   VOUT2 = 2.8V/500mA
• Stable with 4.7mF Output Capacitor
• Stable with Aluminum, Tantalum or Ceramic
   Capacitors
• Built in Thermal Protection
• Fast Transient Response
• Short Setting Time
• SOP-8, SOP-8-P with Thermal Pad Packages
• Adjustment-free Reset Detection Voltage :
   3.9V typ
• Easy to Set Delay Time from Voltage
   Detection to Reset Release
• Lead Free Available (RoHS Compliant)

Applications
• Optical Storage System