AP1501A 150KHz, 5A PWM BUCK DC/DC CONVERTER Features General Description Output voltage: 3.3V, 5V, 12V and adjustable output The AP1501A series are monolithic ICs that are designed for a step-down DC/DC converter, and possess the ability to drive a version 5A load without additional transistor component. Due to reducing Adjustable version output voltage range, 1.23V to the number of external component, the board space can be 37V+4% saved easily. The external shutdown function can be controlled 150Khz +15% fixed switching frequency by logic level and then come into standby mode. The internal Voltage mode non-synchronous PWM control compensation makes feedback control have good line and load Thermal-shutdown and current-limit protection regulation without external design. Regarding protected function, ON/OFF shutdown control input thermal shutdown is to prevent over temperature operating from Operating voltage can be up to 40V damage, and current limit is against over current operating of the Output load current: 5A output switch. The AP1501A series operates at a switching Low power standby mode frequency of 150Khz thus allowing smaller sized filter Built-in switching transistor on chip components than what would be needed with lower frequency Lead Free packages: TO263-5L and TO220-5L(R) switching regulators. Other features include a guaranteed TO263-5L and TO220-5L(R): Available in Green +4% tolerance on output voltage under specified input voltage Molding Compound (No Br, Sb) and output load conditions, and +15% on the oscillator frequency. Lead Free Finish/ RoHS Compliant (Note 1) The output version includes fixed 3.3V, 5V, 12V, and an adjustable type. The packages are available in a standard 5-lead TO263 and TO220 packages. Applications Simple High-efficiency step-down regulator On-card switching regulators Positive to negative converter Typical Application Circuit (1) Fixed Type Circuit FB 12V L1 4 3.3V/5A DC Input 18uH Output Output Load AP1501A 12 -33 Vin Inductor 5 3 D1 Cin SD Gnd Co Schottky Capacitor Capacitor Diode AP1501A Rev. 10 1 of 14 SEPTEMBER 2009 DS31191 www.diodes.com Diodes Incorporated AP1501A 150KHz, 5A PWM BUCK DC/DC CONVERTER Typical Application Circuit (Continued) (2) Adjustable Type Circuit R2 R1 FB L1 12V 4 5V/ 5A 22uH DC Input Output Output Load 12AP1501A Vin 5 3 Cin SD Gnd Co D1 Capacitor Capacitor Schottky Diode R1 V = V (1 + ) out FB R2 V = 1.23V FB R2 = 1K ~ 3K (3) Delay Start Circuit R2 R1 FB L1 12V 4 5V/ 5A 22uH DC Input Output Output Load 12AP1501A Vin C 5 3 DELAY 0.1uF Cin SD Gnd Co D1 Capacitor Capacitor R Schottky Diode DELAY 10K AP1501A Rev. 10 2 of 14 SEPTEMBER 2009 DS31191 www.diodes.com Diodes Incorporated