AP63200/AP63201/AP63203/AP63205 3.8V TO 32V INPUT, 2A LOW IQ SYNCHRONOUS BUCK WITH ENHANCED EMI REDUCTION Description Pin Assignments The AP63200/AP63201/AP63203/AP63205 is a 2A, synchronous buck converter with a wide input voltage range of 3.8V to 32V and TOP VIEW fully integrates a 125m high-side power MOSFET and a 68m low- side power MOSFET to provide high-efficiency step-down DC/DC conversion. FB 1 6 BST The AP63200/AP63201/AP63203/AP63205 device is easily used by minimizing the external component count due to its adoption of peak current mode control along with its integrated compensation network. EN 2 5 SW The AP63200/AP63201/AP63203/AP63205 has optimized designs for Electromagnetic Interference (EMI) reduction. The converter features Frequency Spread Spectrum (FSS) with a switching frequency jitter of VIN 3 4 GND 6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time. It also has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which further erases high- TSOT26 frequency radiated EMI noise caused by MOSFET switching. The device is available in a low-profile, TSOT26 package. Features Applications V 3.8V to 32V 12V and 24V Distributed Power Bus Supplies IN 2A Continuous Output Current Flat Screen TV Sets and Monitors 0.8V 1% Reference Voltage Power Tools and Laser Printers 22A Ultralow Quiescent Current White Goods and Small Home Appliances Switching Frequency FPGA, DSP, and ASIC Supplies o 500kHz: AP63200 and AP63201 Home Audio o 1.1MHz: AP63203 and AP63205 Network Systems Pulse Width Modulation (PWM) Regardless of Output Load Set Top Boxes o AP63201 Gaming Consoles Supports Pulse Frequency Modulation (PFM) Consumer Electronics o AP63200, AP63203, and AP63205 o Up to 80% Efficiency at 1mA Light Load o Up to 88% Efficiency at 5mA Light Load Fixed Output Voltage o 3.3V: AP63203 o 5.0V: AP63205 Proprietary Gate Driver Design for Best EMI Reduction Frequency Spread Spectrum (FSS) to Reduce EMI Precision Enable Threshold to Adjust UVLO Protection Circuitry o Overvoltage Protection o Cycle-by-Cycle Peak Current Limit o 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) & 2015/863/EU (RoHS 3) compliant. 2. See AP63200/AP63201/AP63203/AP63205 Typical Application Circuit INPUT 3 6 VIN C3 BST 100nF L OUTPUT 4.7H 5 V OUT 2 SW 5V EN AP63205 1 C2 C1 FB 2x22F 10F 4 GND Figure 1. Typical Application Circuit Figure 2. Efficiency vs. Output Current Pin Descriptions Pin Number Pin Name Function Feedback sensing terminal for the output voltage. Connect this pin to the resistive divider of the output. 1 FB See Setting the Output Voltage section for more details. Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator and low 2 EN to turn it off. Attach to VIN or leave open for automatic startup. The EN has a precision threshold of 1.18V for programing the UVLO. See Enable section for more details. Power Input. VIN supplies the power to the IC, as well as the step-down converter switches. Drive VIN with a 3 VIN 3.8V to 32V power source. Bypass VIN to GND with a suitably large capacitor to eliminate noise due to the switching of the IC. See Input Capacitor section for more details. 4 GND Power Ground. Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter 5 SW from SW to the output load. Note that a capacitor is required from SW to BST to power the high-side switch. High-Side Gate Drive Boost Input. BST supplies the drive for the high-side N-Channel MOSFET. A 100nF 6 BST capacitor is recommended from SW to BST to power the high-side switch. 2 of 18 January 2019 AP63200/AP63201/AP63203/AP63205 Diodes Incorporated www.diodes.com Document number: DS41326 Rev. 2 - 2