Data Sheet 150kHz 3A BUCK DC-DC CONVERTER AP3003 General Description Features The AP3003 series of regulators are fixed frequency 3.3V, 5V, 12V Fixed ( 4% Tolerance) and Adjust- PWM buck (step-down) DC/DC converter, capable of able ( 3% Tolerance) Output Versions driving a 3A load with excellent line and load regula- Guaranteed 3A Output Load Current tion. These regulators include internal frequency com- 150kHz Fixed Frequency Internal Oscillator pensation and a fixed frequency oscillator so that they Input Voltage Range up to 32V are easy to use. A system adopting AP3003 requires a Requires only 4 external components minimum number of external components to work. High Efficiency up to 90% Excellent Line and Load Regulation A standard series of inductors, optimized for use with TTL Shutdown Capability the AP3003 series, are available from several manu- facturers. This feature greatly simplifies the design of Low Power Standby Mode, I Typically 80 A Q switch-mode power supplies. Built-in Current Limit Protection and Thermal Shutdown Circuit These ICs are available in TO-220-5 and TO-263-5 packages. Applications LCD Monitor and LCD TV On-Card DC-DC Converter DVD Recorder PDP TO-263-5 TO-220-5 Figure 1. Package Types of AP3003 Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Data Sheet 150kHz 3A BUCK DC-DC CONVERTER AP3003 Pin Configuration S Package T Package (TO-263-5) (TO-220-5) 5 ON/OFF 5 ON/OFF 4 FEEDBACK 4 FEEDBACK 3 GND 3 GND 2 OUTPUT 2 OUTPUT V 1 1 V IN IN Metal Tab GND Metal Tab GND Figure 2. Pin Configuration of AP3003 (Top View) Pin Description Pin Number Pin Name Function 1V Unregulated input voltage IN 2 OUTPUT Switch driver output 3 GND Ground 4 FEEDBACK Feedback Pin. For fixed version, connect it to system output. For adjustable version, connect it with an external resistor and capacitor feedback network to program the sys- tem output voltage 5ON/OFF The TTL logic compatible input to control the regulator on or off Aug. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2