1 2 3 4 5 6 7 8 9 10 DATA SHEET www.onsemi.com Buck Converter - High MARKING DIAGRAM Current, Synchronous 1 NCP3231/NCP3231C 1 40 NCP3231 AWLYYWWG QFN40 6x6, 0.5P The NCP3231/NCP3231C is a high current, high efficiency, CASE 485CM voltagefeedforward voltagemode synchronous buck converter which operates from 4.5 V to 18 V input and generates output voltages NCP3231 = Specific Device Code down to 0.6 V at up to 25 A DC load or 30 A instantaneous load. A = Assembly Location WL = Wafer Lot Features YY = Year Wide Input Voltage Range from 4.5 V to 18 V WW = Work Week 0.6 V Internal Reference Voltage G = PbFree Package 500 kHz Switching Frequency External Programmable Softstart PIN CONNECTIONS Lossless Lowside FET Current Sensing Output Overvoltage Protection and Undervoltage Protection System Overtemperature Protection using a Thermistor or Sensor VIN EN 11 40 Hiccup Mode Operation for All Faults VIN 12 39 VCC VIN GND Prebias Startup EP42 EP41 VIN 13 38 VB Adjustable Output Voltage VIN 14 37 PGND VSWH 15 36 BST Power Good Output PGND 16 35 VSW Internal Overtemperature Protection PGND 17 34 VSWH VSWH This is a PbFree Device* EP43 PGND 18 33 VSWH PGND 19 32 VSWH Typical Applications PGND 20 31 VSWH Cellular Base Stations ASIC, FPGA, DSP and CPU Core and I/O Supplies Telecom and Network Equipment (TOP VIEW) Server and Storage System ORDERING INFORMATION Device Package Shipping NCP3231MNTXG QFN40 2500 / (PbFree) Tape & Reel NCP3231CMNTXG For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. *For additional information on our PbFree strategy and soldering details, please download the onsemi Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: August, 2021 Rev. 7 NCP3231/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 SSNCP3231/NCP3231C 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. NCP3231/NCP3231C Block Diagram www.onsemi.com 2