NCP5381A
2/3/4 Phase Buck Controller
for VR10 and VR11 Pentium
IV Processor Applications
The NCP5381A is a two- , three- , or four- phase buck controller
-
-
-
which combines differential voltage and current sensing, and
adaptive voltage positioning to power Intel’s most demanding
Pentium
IV Processors and low voltage, high current power
supplies. Dual- edge pulse- width modulation (PWM) combined with
-
-
inductor current sensing reduces system cost by providing the fastest
initial response to transient loads thereby requiring less bulk and
ceramic output capacitors to satisfy transient load- line requirements.
-
A high performance operational error amplifier is provided, which
allows easy compensation of the system. The proprietary method of
Dynamic Reference Injection makes the error amplifier
compensation virtually independent of the system response to VID
changes, eliminating the need for tradeoffs between load transients
and Dynamic VID performance.
Features
http://onsemi.com
MARKING
DIAGRAM
1
40
1
40 PIN QFN, 7x7
MN SUFFIX
CASE 488AG
NCP5381A
AWLYYWWG
Meets Intel’s VR 10.0, 10.1, 10.2, and 11.0 Specifications
Dual- Edge PWM for Fastest Initial Response to Transient Loading
-
High Performance Operational Error Amplifier
Supports both VR11 and Legacy VR10 Soft- Start Modes
-
Dynamic Reference Injection
8- Bit DAC per Intel’s VR11 Specifications
-
DAC Range from 0.5 V to 1.6 V
0.5%
System Voltage Accuracy
Remote Temperature Sensing per VR11
2, 3, or 4- Phase Operation
-
True Differential Remote Voltage Sensing Amplifier
Phase- to- Phase Current Balancing
- -
“Lossless” Differential Inductor Current Sensing
Differential Current Sense Amplifiers for each Phase
Adaptive Voltage Positioning (AVP)
Fixed No- Load Voltage Positioning at –19 mV
-
Frequency Range: 100 kHz–1.0 MHz
Latched Overvoltage Protection (OVP)
Threshold Sensitive Enable Pin for VTT Sensing
Power Good Output with Internal Delays
Programmable Soft- Start Time
-
Operates from 12 V
This is a Pb- Free Device*
-
Pentium IV Processors
VRM Modules
Graphics Cards
Low Voltage, High Current Power Supplies
NCP5381A = Specific Device Code
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G
= Pb-
-Free Package
*Pin 41 is the thermal pad on the bottom of the device.
ORDERING INFORMATION
Device
NCP5381AMNR2G
Package
Shipping
†
QFN-
-40 2500 / 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.
*For additional information on our Pb-
-Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
Applications
Semiconductor Components Industries, LLC, 2010
November, 2010 - Rev. 5
1
Publication Order Number:
NCP5381A/D
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