NCP81246 Three-Rail Controller with Intel Proprietary Interface for IMVP8 CPU Applications www.onsemi.com The NCP81246 contains a two-phase, and two single-phase buck regulators optimized for Intel IMVP8 compatible CPUs. The two-phase controller combines true differential voltage sensing, differential inductor DCR current sensing, input voltage feed-forward, and adaptive voltage positioning to provide accurately regulated power for IMVP8 Rail2. 1 52 The two single-phase controllers can be used for Rail1, Rail3 and QFN52 Rail4 rails. Both make use of ON Semiconductors patented enhanced MN SUFFIX RPM operation. RPM control maximizes transient response while CASE 485BE allowing for smooth transitions between discontinuous frequency scaling operation and continuous mode full power operation. The MARKING DIAGRAM single-phase rails have an ultralow offset current monitor amplifier with programmable offset compensation for ultra high accuracy current monitoring. The NCP81246 offers three internal MOSFET drivers with a single NCP81246 external PWM signal. FAWLYYWW Two-Phase Rail Features Dual Edge Modulation for Fastest Initial Response to Transient Loading NCP81246 = Specific Device Code F = Wafer Fab High Performance Operational Error Amplifier A = Assembly Site Digital Soft Start Ramp WL = Lot ID Dynamic Reference Injection (Patent US7057381) YY = Year WW = Work Week Accurate Total Summing Current Amplifier(Patent US6683441) = Pb-Free Package Dual High Impedance Differential Voltage and Total Current Sense Amplifiers ORDERING INFORMATION Phase-to-Phase Dynamic Current Balancing Device Package Shipping True Differential Current Balancing Sense Amplifiers for Each Phase NCP81246MNTXG QFN52 5000 / Tape & Reel Adaptive Voltage Positioning (AVP) (PbFree) Switching Frequency Range of 300 kHz 750 kHz For information on tape and reel specifications, Vin range 4.5 V to 25 V including part orientation and tape sizes, please Start-Up into Pre-Charged Loads While Avoiding False OVP refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. UltraSonic Operation These Devices are PbFree, Halogen Free/BFR Free and are RoHS Compliant Single-Phase Rail Features Enhanced RPM Control System Thermal Monitor Ultra Low Offset IOUT Monitor UltraSonic Operation Dynamic VID Feed-Forward Adjustable Vboot Programmable Droop Gain Digitally Controlled Operating Frequency Zero Droop Capable Semiconductor Components Industries, LLC, 2017 1 Publication Order Number: February, 2018 Rev. 6 NCP81246/DNCP81246 +5 V +5 V VCC SKT SNS+ VSP GND SKT SNS VSN PVCC COMP V IN ILIM BST IOUT HG VCC Rail1 SW TSENSE LG NTC V PU CSP CSN VRHOT V V PU PU SDIO ALERT SCLK Batt chrgr PSYS V IN BST TSENSE HG NCP81246 VCC Rail2 SW LG IOUT CSP1 V IN BST SKT SNS+ VSP SKT SNS HG VSN SW DIFFOUT LG FB CSP2 CSREF COMP CSSUM EN ILIM VRRDY V IN CSCOMP NTC VRMP V VRDV IN SKT SNS+ VSP SKT SNS BST VSN PWM PWM HG VCC Rail3 SW COMP EN DRON VCC IOUT LG NTC ILIM NCP81253 CSP CSN Figure 1. Application Schematic www.onsemi.com 2 NTC NTC