NCP81278 Compact 2-Phase Synchronous Buck Controller with Integrated Gate Drivers and PWM VID www.onsemi.com Interface The NCP81278, a generalpurpose twophase synchronous buck controller, integrates gate drivers and PWM VID interface in a QFN20 package and provides a compactfootprint power management solution for new generation computing processors. It has QFN20 CASE 485BC a programmable power save interface (PSI) and is able to operate in 1phase diode emulation mode to obtain high efficiency in lightload condition. Operating in high switching frequency up to 800kHz MARKING DIAGRAM allows employing small size inductor and capacitors. The part is able to support allceramiccapacitor applications. 81278 ALYW Features 3.6 V to 24 V Input Voltage Range Output Voltage up to 2.0 V with PWM VID Interface 81278 = Specific Device Code A = Assembly Location Differential Output Voltage Sense L = Wafer Lot Integrated Gate Drivers Y = Year W = Work Week 200 kHz ~ 800 kHz Switching Frequency = PbFree Package Power Saving Interface (PSI) (Note: Microdot may be in either location) Support both 3.3 V and 1.8 V VID Power Good Output PIN CONNECTIONS Programmable Over Current Protection Over Voltage Protection Under Voltage Protection 1 Thermal Shutdown Protection BST1 BST2 QFN20, 3x3 mm, 0.4 mm Pitch Package HG1 HG2 GND EN PGOOD Typical Applications PSI COMP/ILMT VID FB GPU and CPU Power Graphics Card Applications Desktop and Notebook Applications (Top View) ORDERING INFORMATION Device Package Shipping NCP81278MNTXG QFN20 4,000 / (PbFree) Tape & Reel 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. Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: April, 2017 Rev. 4 NCP81278/D VIDBUF PH1 REFIN LG1 VREF PVCC FS LG2 FBRTN PH2NCP81278 VIN +5V HG1 2 18 PVCC BST1 1 VOUT 21 GND PH1 20 LG1 19 3.3V/1.8V VIN EN 3 EN NCP81278 HG2 14 PSI 4 PSI BST2 15 PG 13 PGOOD PH2 16 VID 5 VID LG2 17 8 VREF 7 REFIN FBRTN 10 6 VIDBUF FB 11 COMP/ 9 FS 12 ILMT Figure 1. Typical Application Circuit with PWMVID Interface VIN +5V 18 PVCC HG1 2 BST1 1 VOUT 21 GND PH1 20 LG1 19 3.3V/1.8V VIN EN 3 EN NCP81278 HG2 14 PSI 4 PSI BST2 15 PG 13 PGOOD PH2 16 5 VID LG2 17 8 VREF 7 REFIN FBRTN 10 6 VIDBUF FB 11 COMP/ 9 FS 12 ILMT Figure 2. Typical Application Circuit without PWMVID Interface www.onsemi.com 2