AP6503ASP-13 Diodes Incorporated

AP6503A 240kHz 23V 3A SYNCHRONOUS DC/DC BUCK CONVERTER Description Pin Assignments The AP6503A is a 240kHz switching frequency external compensated synchronous DC-DC buck converter. It has integrated low R high DS(ON) (Top View) and low-side MOSFETs. BST 1 8 SS The AP6503A enables continuous load current of up to 3A with efficiency as high as 95%. 2 7 EN IN The AP6503A features current mode control operation, which enables fast transient response time and easy loop stabilization. 3 6 COMP SW The AP6503A simplifies board layout and reduces space requirements GND 4 5 FB with its high level of integration and minimal need for external components, making it ideal for distributed power architectures. SO-8EP The AP6503A is available in a standard Green SO-8EP package with Figure 1. Package Pin Out exposed PAD for improved thermal performance and is RoHS compliant. Applications Features Gaming Consoles V 4.75V to 23V IN Flat Screen TV Sets and Monitors 3A Continuous Output Current at 12V and 3.3V , 5.5A Peak IN OUT Set Top Boxes V Adjustable to 0.925V to 20V OUT Distributed Power Systems 240kHz Switching Frequency Home Audio Programmable Soft-Start Consumer Electronics Enable Pin Network Systems Protection FPGA, DSP and ASIC Supplies OCP Green Electronics Thermal Shutdown 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 AP6503A Typical Applications Circuit 100 90 INPUT 1 2 BST IN C5 L1 V = 5V 10nF OUTPUT IN 10 H 3 80 V ) OUT ON SW % EN 3.3V ( AP6503A V = 12V IN OFF 7 Y R1 C 26.1k 5 N 70 C2 FB C1 E 47 F I R2 22 F C 6 8 I C3 10k COMP F SS F 6.8nF C4 E 60 0.1 F GND R3 6.8k 4 50 V = 3.3V OUT L = 10H 40 Figure 2. Typical Application Circuit 0 1 2 3 LOAD CURRENT (A) Efficiency vs. Load Current Pin Descriptions Pin Pin Function Number Name High-Side Gate Drive Boost Input. BST supplies the drive for the high-side N-Channel MOSFET switch. Connect 1 BST a 0.01F or greater capacitor from SW to BST to power the high-side switch. Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.75V 2 IN to 23V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor. Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter 3 SW from SW to the output load. Note that a capacitor is required from SW to BST to power the high-side switch. 4 GND Ground (Connect the exposed pad to Pin 4). Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider 5 FB connected to it from the output voltage. The feedback threshold is 0.925V. See Setting the Output Voltage. Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network 6 COMP from COMP to GND. In some cases, an additional capacitor from COMP to GND is required. See Compensation Components. Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator low to 7 EN turn it off. Attach to IN with a 100k pull up resistor for automatic startup. Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-start 8 SS period. A 0.1F capacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS floating. EP EP EP exposed thermal pad connect to Pin 4 GND 2 of 15 AP6503A March 2017 Diodes Incorporated www.diodes.com Document number: DS36000 Rev. 4 - 2 NEW PRODUCT EFFICIENCY (%)