AP65111WU-7 Diodes Incorporated

AP65111 TSOT26 LIGHT LOAD IMPROVED 1.5A SYNCH DC-DC BUCK CONVERTER Description Pin Assignments The AP65111 is an internally compensated synchronous DC-DC buck converter with a 500kHz switching frequency. It is integrated with high and low-side MOSFETs with low R . DS(ON) Top View The AP65111 enables continuous load current of up to 1.5A with IN 1 6 FB efficiency as high as 97%. The AP65111 implements an automatic custom light-load efficiency 2 EN GND 5 improvement algorithm. The AP65111 features current mode control operation, which enables BST SW 3 4 fast transient response times and easy loop stabilization. The AP65111 simplifies board layout and reduces space TSOT26 requirements with its high level of integration and minimal need for external components, making it ideal for distributed power architectures. The AP65111 is available in a standard Green TSOT26 package and is RoHS compliant. Features Applications Gaming Consoles V 4.5V to 16V IN Flat-Screen TV Sets and Monitors 1.5A Continuous Output Current Set-Top-Boxes Efficiency Up to 97% Distributed Power Systems Automated Light-Load improvement Home Audio V Adjustable from 0.8V OUT Consumer Electronics 500kHz Switching Frequency Network Systems Internal Soft-Start FPGA, DSP and ASIC Supplies Enable Pin Green Electronics Overvoltage Protection & Undervoltage Protection Overcurrent Protection (OCP) with Hiccup Thermal Protection 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 AP65111 Pin Descriptions Pin Number Pin Function Name TSOT26 Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.5V to IN 1 16V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor on Page 10. Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter SW 2 from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch. GND 3 Ground High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET a 0.01F or greater BST 4 capacitor from SW to BS to power the high-side switch. Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator low to EN 5 turn it off. Attach to IN with a 100k pull up resistor for automatic startup. Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider connected FB 6 to it from the output voltage. The feedback threshold is 0.8V. See Setting the Output Voltage on Page 9. Functional Block Diagram 0.4V Internal 5 0.8V EN Reference 1.1V Vcc 1 IN Regulator + OVP - 1.1V S =0.9V/T R =0.22V/A E T 6 + Oscillator UVP FB + 500kHz 0.4V - 4 1pF BST OCP Ref 62pF 650k - Logic + 0.8V + - + 2 Internal SS PWM SW Error Comparator Amplifier 3 GND 2 of 14 AP65111 October 2016 Diodes Incorporated www.diodes.com Document number: DS39153 Rev. 1 - 2 - +