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© Semiconductor Components Industries, LLC, 2017
June, 2017 − Rev. 2
1 Publication Order Number:
NCP81243/D
NCP81243
Dual Output 3 & 2 Phase
Controller with Single Intel
Proprietary Interface for
Desktop and Notebook CPU
Applications
The NCP81243 dual output three plus two phase buck solutions are
optimized for Intel®’s IMVP8 CPUs. The NCP81243 offer five PWM
drive signals that can be configured in multiple setups. The 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 both desktop
and notebook applications.
The control system is based on Dual−Edge pulse−width modulation
(PWM) combined with DCR current sensing providing an ultra fast
initial response to dynamic load events and reduced system cost. The
NCP81243 provides the mechanism to shed phases during light load
operation and can auto frequency scale in light load conditions while
maintaining excellent transient performance.
Dual high performance operational error amplifiers are provided to
simplify compensation of the complete system. Patented Dynamic
Reference Injection further simplifies loop compensation by
eliminating the need to compromise between closed−loop transient
response and Dynamic VID performance. Patented Total Current
Summing provides highly accurate current monitoring for droop and
digital current monitoring.
Features
• Meets Intel’s IMVP8 Specification
• Current Mode Dual Edge Modulation for Fast Initial Response to
Transient Loading
• Dual High Performance Operational Error Amplifier
• One Digital Soft Start Ramp for Both Rails
• Dynamic Reference Injection
• Accurate Total Summing Current Amplifier
• DAC with Droop Feed−forward Injection
• Dual High Impedance Differential Voltage and Total
Current Sense Amplifiers
• Phase−to−Phase Dynamic Current Balancing
• “Lossless” DCR Current Sensing for Current Balancing
• Summed Compensated Inductor Current Sensing for
Droop
• True Differential Current Balancing Sense Amplifiers
for Each Phase
• Adaptive Voltage Positioning (AVP)
• Switching Frequency Range of 300 kHz – 1.4 MHz
• Startup into Pre−Charged Loads while Avoiding False
OVP
• Pin Programmable Power Saving Phase Shedding
• Vin Feed Forward Ramp Slope
• Over Voltage Protection (OVP) & Under Voltage
Protection (UVP)
• Over Current Protection (OCP)
• Dual Power Good Output with Internal Delays
• These Devices are Pb−Free and are RoHS Compliant
Applications
• Desktop & Notebook Processors
• Gaming
MARKING
DIAGRAM
www.
onsemi.com
521
QFN52
MN SUFFIX
CASE 485BE
NCP81243 = Specific Device Code
F = Wafer Fab
A = Assembly Site
WL = Lot ID
YY = Year
WW = Work Week
G = Pb−Free Package
NCP81243
FAWLYYWW
G
Device Package Shipping
†
ORDERING INFORMATION
NCP81243MNTXG QFN52
(Pb−Free)
2500 / 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.
Verzeichnis
- ・ Abmessungen des Paketumrisses on Seite 26
- ・ Paket-Footprint-Pad-Layout on Seite 26
- ・ Teilenummerierungssystem on Seite 1 Seite 27
- ・ Markierungsinformationen on Seite 1 Seite 26 Seite 27
- ・ Blockdiagramm on Seite 4 Seite 5
- ・ Technische Daten on Seite 9
- ・ Anwendungsbereich on Seite 1
- ・ Elektrische Spezifikation on Seite 10 Seite 11 Seite 12 Seite 13
- ・ Teilenummernliste on Seite 9
