Semiconductor Components Industries, LLC, 2017
February, 2017 − Rev. 5
1 Publication Order Number:
NCP81246/D
NCP81246
Three-Rail Controller
with Intel Proprietary
Interface for IMVP8 CPU
Applications
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.
The two single-phase controllers can be used for Rail1, Rail3 and
Rail4 rails. Both make use of ON Semiconductor’s patented enhanced
RPM operation. RPM control maximizes transient response while
allowing for smooth transitions between discontinuous frequency
scaling operation and continuous mode full power operation. The
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
external PWM signal.
Two-Phase Rail Features
• Dual Edge Modulation for Fastest Initial Response to Transient
Loading
• High Performance Operational Error Amplifier
• Digital Soft Start Ramp
• Dynamic Reference Injection
(Patent #US7057381)
• Accurate Total Summing Current Amplifier(Patent #US6683441)
• Dual High Impedance Differential Voltage and Total Current Sense
Amplifiers
• Phase-to-Phase Dynamic Current Balancing
• True Differential Current Balancing Sense Amplifiers for Each Phase
• Adaptive Voltage Positioning (AVP)
• Switching Frequency Range of 300 kHz – 750 kHz
• Vin range 4.5 V to 25 V
• Start-Up into Pre-Charged Loads While Avoiding False OVP
• UltraSonic Operation
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Single-Phase Rail Features
• Enhanced RPM Control System
• Ultra Low Offset IOUT Monitor
• Dynamic VID Feed-Forward
• Programmable Droop Gain
• Zero Droop Capable
• Thermal Monitor
• UltraSonic Operation
• Adjustable Vboot
• Digitally Controlled Operating Frequency
MARKING DIAGRAM
www.
onsemi.com
521
QFN52
MN SUFFIX
CASE 485BE
NCP81246 = Specific Device Code
F = Wafer Fab
A = Assembly Site
WL = Lot ID
YY = Year
WW = Work Week
G = Pb-Free Package
NCP81246
FAWLYYWW
G
Device Package Shipping
†
ORDERING INFORMATION
NCP81246MNTXG QFN52
(Pb−Free)
5000 / Tape & Ree
†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.
