Dual Channel 500mA/500mA Regulator + Reset IC
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Oct., 2005
www.anpec.com.tw1
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
APL5551
• Low Quiescent Current : 110µA (No load)
• Low Dropout Voltage :
VDROP1 = 450mV @ 500mA
VDROP2 = 500mV @ 500mA
• Fixed Output Voltage :
VOUT1 = 3.3V/500mA
VOUT2 = 2.8V/500mA
• Stable with 4.7µF 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)
Features 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 volt-
age 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 main-
tains a low supply current. Other features include, ther-
mal-shutdown protection, current limit protection to
ensure specified output current. The APL5551 comes
in miniature SOP-8 and SOP-8-P packages.
Applications
• Optical Storage System
Pin Configuration
1
2
3
4 5
6
7
8VIN
GND
VDET
VOUT1
VOUT2
CONT
Cd RESET
= Thermal Pad
(connected to GND plane for better heat
dissipation)
SOP-8 (Top View) SOP-8-P( Top View)
1
2
3
4 5
6
7
8VIN
GND
VDET
VOUT1
VOUT2
CONT
Cd RESET