AP1506 150kHz, 3A PWM BUCK DC/DC CONVERTER Description Pin Assignments The AP1506 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 3A load without (Top View) external transistor. Due to reducing the number of external components, the board space can be saved easily. The external 5 SD shutdown function can be controlled by logic level and then come into 4 FB standby mode. The internal compensation makes feedback control 3 GND have good line and load regulation without external design. Regarding 2 Output protected function, thermal shutdown is to prevent over temperature 1 V IN operating from damage, and current limit is to prevent over current Metal Tab GND operating of the output switch. If current limit function occurred and V is down to 0.5V below, the switching frequency will be reduced. TO263-5 FB The AP1506 series operate at a switching frequency of 150kHz thus (Top View) allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a 5 SD guaranteed 4% tolerance on output voltage under specified input 4 FB voltage and output load conditions, and 15% on the oscillator 3 GND frequency. The output version included fixed 3.3V, 5V, 12V, and an 2 Output adjustable type. The packages are available in a standard 5-lead 1 V IN TO263-5, TO220-5 and TO220-5 (R). TO220-5/TO220-5 (R) Features Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version Applications Adjustable Version Output Voltage Range, 1.23V to 18V+4% Simple High-Efficiency Step-Down Regulator 150kHz +15% Fixed Switching Frequency On-Card Switching Regulators Voltage Mode Non-Synchronous PWM Control Positive to Negative Converter Thermal-Shutdown and Current-Limit Protection ON/OFF Shutdown Control Input Operating Voltage can be 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) compliant. 2. See AP1506 Typical Application Circuit (1) Fixed Type Circuit FB 12V L1 4 3.3V/3A DC Input uH 33 Output Output Load AP1506 1 2 -33 Inductor V IN 5 3 D1* Co C SD GND IN Schottky Diode Capacitor Capacitor (2) Adjustable Type Circuit R1 R2 FB 12V L1 4 5V/ 3A 47uH DC Input Output Output Load 1 AP1506 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 FB R2 = 1k to 3k (3) Delay Start Circuit R2 R1 FB L1 12V 4 5V/ 3A 47uH DC Input Output Output Load AP1506 2 1 V IN C DELAY 3 5 0.1uF SD GND C IN Co D1* Capacitor R Capacitor DELAY Schottky Diode 10K Note: For up to 2A = DFLS230L (V = 0.42V) F For up to 3A = B340LA, B340LB (V = 0.45V) F 2 of 14 AP1506 December 2017 Diodes Incorporated www.diodes.com Document number: DS31015 Rev. 8 - 2