1 2 3 4 5 6 7 8 9 10 NCP3231B Buck Converter - Synchronous, High Current The NCP3231B is a high current, high efficiency, voltagemode synchronous buck converter which operates from 4.5 V to 18 V input and generates output voltages down to 0.6 V at up to 25 A. www.onsemi.com Features Wide Input Voltage Range from 4.5 V to 18 V MARKING 0.6 V Internal Reference Voltage DIAGRAM 1 MHz Switching Frequency External Programmable Softstart 1 Lossless Lowside FET Current Sensing 1 40 NCP3231B AWLYYWWG Output Overvoltage Protection and Undervoltage Protection QFN40 6x6, 0.5P CASE 485CM System Overtemperature Protection using a Thermistor or Sensor Hiccup Mode Operation for All Faults NCP3231B = Specific Device Code Prebias Startup A = Assembly Location WL = Wafer Lot Adjustable Output Voltage YY = Year Power Good Output WW = Work Week Internal Overtemperature Protection G = PbFree Package This is a PbFree Device* PIN CONNECTIONS Typical Applications Cellular Base Stations ASIC, FPGA, DSP and CPU Core and I/O Supplies Telecom and Network Equipment VIN EN 11 40 Server and Storage System VIN VCC 12 VIN GND 39 EP42 EP41 VIN 13 38 VB VIN 14 37 PGND VSWH 15 36 BST PGND 16 35 VSW PGND 17 34 VSWH VSWH EP43 PGND 18 33 VSWH 19 32 PGND VSWH PGND 20 31 VSWH (TOP VIEW) ORDERING INFORMATION Device Package Shipping NCP3231BMNTXG QFN40 2500 / (PbFree) Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please *For additional information on our PbFree strategy and soldering details, please refer to our Tape and Reel Packaging Specification download the ON Semiconductor Soldering and Mounting Techniques Brochure, BRD8011/D. Reference Manual, SOLDERRM/D. Semiconductor Components Industries, LLC, 2017 1 Publication Order Number: August, 2019 Rev. 0 NCP3231B/D PGND VIN 21 PGND VIN 22 VIN PGND 23 PGND PG 24 PGND 25 OTS AGND PGND 26 PGND 27 ISET PGND 28 COMP 29 FB VSWH 30 VSWH SSNCP3231B VB VCC VB VCC LDO VB VB BST VIN OSC COMP VDD Control Logic VREF + Ramp Generator E/A PWM Logic FB and VSWH UVLO VSW SS Soft Start OVP, UVP Power Good VCC OCP, TSD VB PVDD 2 A Protection EN Enable Logic 1.2 V POR PGND PG VB VREF + OTS AGND ISET Figure 1. NCP3231B Block Diagram www.onsemi.com 2