NCP4201MNR2G Datasheet, PDF (1/32 Pages) ON Semiconductor – Programmable Multi-Phase Synchronous Buck Converter with PMBus

NCP4201
Programmable Multi-Phase
Synchronous Buck
Converter with PMBus
The NCP4201 is an integrated power control IC with a PMBus
interface. It combines a highly efficient, multi−phase, synchronous
buck switching regulator controller with a PMBus interface, which
enables digital programming of key system parameters to optimize
system performance and provide feedback to the system.
It uses an internal 8−bit DAC to read a Voltage Identification (VID)
code directly from the processor, which is used to set the output
voltage between 0.375 V and 1.6 V.
This device uses a multi−mode PWM architecture to drive the
logic−level outputs at a programmable switching frequency that can
be optimized for VR size and efficiency. The NCP4201 can be
programmed to provide 2−, 3−, or 4−phase operation, allowing for the
construction of up to four complementary buck−switching stages. The
NCP4201 supports PSI, which is a Power Save Mode.
The NCP4201 includes a PMBus interface which can be used to
program system set points such as voltage offset, load−line and phase
balance and output voltage. Key system performance data, such as
CPU current, CPU voltage, and power and fault conditions can also be
read back over the PMBus from the NCP4201.
The NCP4201 is specified over the extended commercial
temperature range of 0°C to +85°C and is available in a 40 Lead QFN
package.
Features
• Selectable 2−, 3−, or 4−Phase Operation at Up to 1.5 MHz per Phase
• PMBus Interface − Enables Digital Programmability of Set Points
and Read−back of Monitored Values
• Logic−Level PWM Outputs for Interface to External High Power
Drivers
• Fast−Enhanced PWM for Excellent Load Transient Performance
• Active Current Balancing Between All Output Phases
• Built−In Power−Good/Crowbar Blanking Supports On−The−Fly
(OTF) VID Code Changes
• Digitally Programmable 0.375 V to 1.6 V Output Supports Both
VR11 and VR11.1 Specifications
• Programmable Short−Circuit Protection with Programmable
Latchoff Delay
• Supports PSI – Power Saving Mode During Light Loads
Applications
• Desktop PC Power Supplies for VRM Modules
© Semiconductor Components Industries, LLC, 2009
1
September, 2009 − Rev. 0
http://onsemi.com
1 40
QFN40 6x6
CASE 488AR
MARKING DIAGRAM
NCP4201
AWLYYWWG
A
= Assembly Location
WL = Wafer Lot
YYWW = Date Code
G
= Pb−Free Package
PIN ASSIGNMENT
VCC3 ₁
ALERT 2
FAULT 3
SDA 4
SCL 5
EN 6
GND 7
IMON 8
IREF 9
RT 10
PIN 1
INDICATOR
NCP4201
TOP VIEW
30 VCC
29 PWM1
28 PWM2
27 PWM3
26 PWM4
25 SW1
24 SW2
23 SW3
22 SW4
21 OD1
ORDERING INFORMATION
Device*
Package
Shipping^†
NCP4201MNR2G QFN40 2500/Tape & Reel
*The “G’ suffix indicates Pb−Free package.
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Publication Order Number:
NCP4201/S