AP1507 150kHz, 3A PWM BUCK DC/DC CONVERTER Description Pin Assignments The AP1507 is a monolithic IC designed for a step-down DC/DC converter and is capable of driving a 3A load without an external (Top View) transistor. Due to reducing the number of external components, the 5 SD board space can be saved easily. 4 FB The external shutdown function can be controlled by logic level and 3 GND then go into standby mode. The internal compensation makes the 2 Output feedback control have good line and load regulation without an 1 V IN external design. Regarding the protected function, the thermal Metal Tab GND shutdown prevents overtemperature operation from damaging the TO252-5L device, and current limit protects against overcurrent operation of the output switch. If the current limit function occurs, and V is down to FB 0.5V below, the switching frequency reduces. The AP1507 series operates at a switching frequency of 150kHz, which allows smaller-sized filter components than the requirements with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions and +15% on the oscillator frequency. The output version included a fixed 3.3V, 5V, 12V, and an adjustable type. AP1507 is available in a 5-lead TO-252 green package. Features Applications Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version Simple High-Efficiency Step-Down Regulator Adjustable Version Output Voltage Range, 1.23V to 18V +4% On-Card Switching Regulators 150kHz +15% Fixed Switching Frequency Positive to Negative Converter Voltage Mode Non-Synchronous PWM Control Thermal-Shutdown and Current-Limit Protection ON/OFF Shutdown Control Input Operating Voltage up to 22V Output Load Current: 3A Low Power Standby Mode Built-in Switching Transistor On Chip Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See AP1507 Typical Application Circuit (1) Fixed Type Circuit (2) Adjustable Type Circuit R2 R1 FB L1 12V 4 5V/ 3A 47uH DC Input Output Output Load 1 AP1507 2 V in 5 3 SD GND Co C in D1 Capacitor Capacitor Schottky Diode R1 V = V (1 + ) OUT FB R2 V = 1.23V, R2 = 1K ~ 3K FB (3) Delay Start Circuit R2 R1 FB L1 12V 4 5V/ 3A 47uH DC Input Output Output Load 1 AP1507 2 V in C DELAY 5 3 0.1uF SD GND C Co in D1 Capacitor Capacitor R DELAY Schottky Diode 10K 10 of 12 October 2018 AP1507 Diodes Incorporated www.diodes.com Document number: DS31067 Rev. 4 - 2