NCP81174 4/3/2-Phase Synchronous Buck Controller with Power Saving Mode and PWM VID Interface www.onsemi.com The NCP81174 is a generalpurpose up to fourphase synchronous buck controller. It combines differential voltage sensing, differential phase current sensing, and PWM VID interface to provide accurate regulated power for the computer or graphic controllers. It can receive power saving command (PSI) from processors and operates in 1 32 singlephase diode emulation mode to obtain high efficiency in light QFN32 load. Dualedge multiphase PWM modulation ensures a fast transient MW SUFFIX CASE 488AM response with minimum possible capacitors. Features MARKING DIAGRAM Output Voltage up to 2.0 V with PWM VID Interface 1 Support 1.8 V and 3.3 V VID interface NCP81174 Remote Differential Output Voltage Sense AWLYYWW Differential Current Sense For Each Phase 200 kHz 1000 kHz Switching Frequency Power Saving Interface (PSI) A = Assembly Location WL = Wafer Lot Power Good Output YY = Year Thermally Compensated Current Monitoring WW = Work Week Over Current Protection = PbFree Package Fast Transient Response (Note: Microdot may be in either location) 5 V V Shunt Regulator CC Latched OVP and UVP Protections ORDERING INFORMATION QFN32, 5 x 5 mm, 0.5 mm Pitch Package Device Package Shipping This is a PbFree Device NCP81174MNTXG QFN32 2500 / Tape & Typical Applications (PbFree) Reel GPU and CPU Power For information on tape and reel specifications, including part orientation and tape sizes, please Graphics Card Applications refer to our Tape and Reel Packaging Specifications Desktop and Notebook Applications Brochure, BRD8011/D. Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: March, 2015 Rev. 5 NCP81174/DNCP81174 32 31 30 29 28 27 26 25 24 1 CS4 VIDBUF 2 23 CS4N VID 3 22 VR RDY CS3 NCP81174 4 21 EN CS3N Top View (not to scale) PSI 5 20 CS2 6 19 12VMON CS2N 7 18 ROSC CS1 FLAG/GND (Pin 32) 8 17 ILIM CS1N 10 11 12 13 14 15 16 9 Figure 1. Pinout www.onsemi.com 2 VSP REFIN VREF VSN VCC DIFFOUT DRVON COMP G4 VFB G3 VDRP G2 VDFB G1 CSSUM