4/3/2/1 Multi-Phase Buck Controller with PWM VID 2 and I C Interface NCP81611 Description The NCP81611 is a multiphase synchronous controller optimized www.onsemi.com for new generation computing and graphics processors. The device is capable of driving up to 4 phases and incorporates differential voltage and phase current sensing, adaptive voltage positioning and PWM VID interface to provide and accurately regulated power for computer or graphic controllers. The integrated power saving 1 40 interface (PSI) allows for the processors to set the controller in one of QFN40 5x5, 0.4P CASE 485CR three modes, i.e. all phases on, dynamic phases shedding or fixed low phase count mode, to obtain high efficiency in lightload conditions. MARKING DIAGRAM The dual edge PWM multiphase architecture ensures fast transient response and good dynamic current balance. 1 Features NCP81611 AWLYYWW Compliant with NVIDIA OVR4i+ Specifications Supports up to 4 Phases 2.8 V to 20 V Supply Voltage Range: NCP81611 = Device Code A = Assembly Site 250 kHz to 1.2 MHz Switching Frequency (4 Phase) WL = Wafer Lot Number Power Good Output YY = Year of Production, Last Two Numbers Under Voltage Protection (UVP) WW = Work Week Number Over Voltage Protection (OVP) PIN CONNECTIONS System Over Current Protection (OCP) Per Phase Over Current Limiting (OCL) Startup into PreCharged Loads while Avoiding False OVP Configurable Load Line High Performance Operational Error Amplifier REFIN 1 30 COMP VREF 2 29 FB True Differential Current Balancing Sense Amplifiers for Each Phase 3 28 VRMP DIFF NCP81611 SS 4 27 FSW PhasetoPhase Dynamic Current Balancing I2C 5 (Top view 26 TMON Current Mode Dual Edge Modulation for Fast Initial Response to LPC1 6 25 IOUT 7 24 LPC2 ILIM Transient Loading Thermal/Gnd Pad PWM4/PHTH1 8 23 CSCOMP Power Saving Interface (PSI) PWM3/PHTH2 9 22 CSSUM 10 21 PWM2/PHTH3 CSREF Automatic Phase Shedding with User Settable Thresholds 2 PWM VID and I C Control Interface Compact 40 Pin QFN Package (5 x 5 mm Body, 0.4 mm Pitch) These Devices are PbFree and are RoHS Compliant Typical Applications ORDERING INFORMATION GPU and CPU Power Device Package Shipping Graphic Cards NCP81611MNTXG QFN40 5000 / Tape Desktop and Notebook Applications (PbFree) & Reel Docking Stations For information on tape and reel specifications, Power Banks including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: May, 2020 Rev. 4 NCP81611/D PWM1/PHTH4 11 40 VID BUFF 12 DRON 39 PWM VID 13 NC 38 PGOOD 14 NC 37 PSI 15 NC 36 EN NC 16 35 SCL CSP4 17 34 SDA 18 CSP3 33 VCC 19 CSP2 32 VSN CSP1 20 31 VSPNCP81611 . Figure 1. Typical Controller Application Circuit www.onsemi.com 2 J040 TP45 TP46 TP47 TP48 TP49 TP50 TP51 VCC DUT VSN sense 2 1 R128 4 3 1 2 6 5 ILIM J4 R38 8 7 EN SDA 10 9 12 11 SCL C5 14 13 J SDA C17 16 15 PSI SCL EN 18 17 R130 20 19 1 2 R129 1 2 J1 PGOOD 1 4 2 TP10 C2 VSP sense R37 1 2 1 2 TP52 TP53 TP54 TP36 TP44 TP37 R16 REFIN R21 C18 TP42 C15 R49 R43 2 1 U1 21 2 1 2 1 2 12 1 R9 TP38 1 2 TP43 C3 VIN 1 2 TP39 C16 R48 TP55 TP56 TP57 TP58 TP59 1 30 C4 2 1 2 1 1 2 REFIN COMP TP41 C1 2 29 VREF FB TP40 VREF 3 28 VRAMP DIFF 4 27 SS FSW 5 26 NCP81611 I2C TMON 6 25 LPC1 IOUT 7 24 ILIM LPC2 ILIM 8 23 PWM4/PHTH1 CSCOMP PWM4 9 22 PWM3 PWM3/PHTH2 CSSUM 10 21 PWM2/PHTH3 CSREF PWM2 PWM1 41 C13 PAD R18 R22 R14 TP62 R7 R10 R2 R4 R13 TP60 DRON TP61 2 1 R29 2 1 R32 2 1 R504 2 1 R30 3 5 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 R25 1 2 R28 1 2 11 40 PWM1/PHTH4 VID BUFF 12 39 DRON PWM VID 13 38 NC PGOOD 14 37 NC PSI 15 36 NC EN 16 35 NC SCL 17 34 ISNS4 CSP4 SDA 18 33 1 2 ISNS3 CSP3 VCC 19 32 ISNS2 CSP2 VSN 20 31 ISNS1 CSP1 VSP 1 2 R150 2 1 Ext bias 2 1 12 2 R44 1 CSN4 R45 2 1 CSN3 R46 2 1 CSN2 R47 2 1 CSN1 R51 2 1 2 1 C19 R127 2 1 R126 R336 2 1 2 1 2 1 C185 2 1 R146 2 1 TMON4 C20 R147 2 1 TMON3 R148 2 1 R124 R56 TMON2 2 1 2 1 R149 2 1 TMON1 R57 R125 2 1 2 1