NCP81243 datasheet(1/26 Pages) ONSEMI

Part #	NCP81243

Description	Dual Output 3 & 2 Phase Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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February, 2016 − Rev. 0

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, Halogen Free/BFR Free

and are RoHS Compliant

Applications

• Desktop & Notebook Processors

• Gaming

MARKING

DIAGRAM

www.onsemi.com

52

1

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.

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