General Description
AP1533 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS.

Features
• Input voltage: 4V to 23V
• Output voltage: 0.8V to VCC
• Output current: 1.8A up to peak 2A
• Duty ratio: 0% to 99% PWM control
• Oscillation frequency: 300KHz typ.
• Soft-start like, Current limit and Enable function
• Thermal Shutdown function
• Built-in internal SW P-channel MOS
• SOP-8L: Available in “Green” Molding Compound(No Br, Sb) 
• Lead Free Finish/ RoHS Compliant (Note 1)

Applications
•PC Motherboard
•LCD Monitor
•Graphic Card
•DVD-Video Player
•Telecom Equipment
•ADSL Modem
• Printer and other Peripheral Equipment
•Microprocessor core supply