AP2004 PWM BUCK CONTROLLER General Description Features The AP2004 integrates Pulse-Width-Modulation (PWM) control PWM Buck Control Circuitry circuit into a single chip, mainly designs for power-supply Operating voltage can be up to 27V regulator. All the functions include an on-chip 1.25V reference Under voltage Lockout (UVLO) Protection output, an error amplifier, an adjustable oscillator, a soft-start, Short Circuit Protection (SCP) UVLO, SCP circuitry, and a push-pull output circuit. Switching Soft-start circuit frequency is adjustable by trimming CT. During low VCC situation, Variable Oscillator Frequency -- 300Khz Max the UVLO makes sure that the outputs are off until the internal 1.25V voltage reference Output circuit operates normally. 8-pin SOP package SOP-8L: Available in Green Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) Applications Backlight inverter LCD Monitor CDROM, XDSL Product DC/DC converters in computers, etc. Ordering Information AP 2004 S X - 13 Package Lead Free Packing 13 : Tape & Reel S : SOP-8L L : Lead Free G : Green Package Packaging 13 Tape and Reel Device Code (Note 2) Quantity Part Number Suffix AP2004SL-13 S SOP-8L 2500/Tape & Reel -13 Lead-free AP2004SG-13 S SOP-8L 2500/Tape & Reel -13 Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at AP2004 PWM BUCK CONTROLLER Pin Assignments ( Top View ) OUT 1 8 GND CT 2 7 VCC 3 6 SS COMP 4 5 FB SCP SOP-8L Pin Descriptions Pin Name Description CT Timing Capacitor FB Voltage Feedback SS Soft-Start. COMP Feedback Loop Compensation OUT PWM Output GND Ground VCC Supply Voltage SCP Short Circuit Protection AP2004 Rev. 3 2 of 8 FEBRUARY 2009 www.diodes.com Diodes Incorporated