NCP81246 Datasheet, PDF (1/28 Pages) ON Semiconductor – Three-Rail Controller

NCP81246
Three-Rail Controller
with SVID 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 GT rails.
The two single-phase controllers can be used for Core, SA and
GTUS 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
www.onsemi.com
1 52
QFN52
MN SUFFIX
CASE 485BE
MARKING DIAGRAM
NCP81246
FAWLYYWW
G
NCP81246 = Specific Device Code
F
= Wafer Fab
A
= Assembly Site
WL
= Lot ID
YY
= Year
WW
= Work Week
G
= Pb-Free Package
ORDERING INFORMATION
Device
Package
Shipping^†
NCP81246MNTXG QFN52 5000 / Tape & Reel
(Pb−Free)
†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.
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
© Semiconductor Components Industries, LLC, 2015
1
December, 2015 − Rev. 0
Publication Order Number:
NCP81246/D