NCP4208 Datasheet, PDF (1/30 Pages) ON Semiconductor – VR11.1 Programmable 8-Phase Synchronous Buck Converter with PMBus

NCP4208
VR11.1 Programmable
8-Phase Synchronous Buck
Converter with PMBus
The NCP4208 is an integrated power control IC with a PMBus
interface. The NCP4208 is a highly efficient, multiphase, synchronous
buck switching regulator controller, which aids design of High
Efficiency and High Density solutions. The NCP4208 can be
programmed for 1−, 2−, 3−, 4−, 5−, 6−, 7− or 8−phase operation,
allowing for the construction of up to 8 complementary buck switching
stages.
The NCP4208 supports PSI, which is a power state indicator and
can be used to reduce the number of operating phases at light loads.
The PMBus interface enables digital programming of key system
parameters to optimize system performance and provide feedback to
the system.
The NCP4208 has a built in shunt regulator that allows the part to be
powered from the +12 V system supply through a series resistor. The
NCP4208 is specified over the extended commercial temperature
range of 0°C to +85°C and is available in a 48 Lead QFN package.
Features
• Selectable 1−, 2−, 3−, 4−, 5−, 6−, 7− or 8−Phase Operation at
Up to 1.5 MHz per Phase
• Temperature Measurement
• 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
VR11.1 Specifications
• Short Circuit Protection with Latchoff Delay
• Supports PSI Power Saving Mode During Light Loads
• This is a Pb−Free Device
Applications
• Desktop PC
• Servers
http://onsemi.com
1 48
QFN 48
CASE 485AJ
MARKING DIAGRAM
NCP4208
AWLYYWWG
A
= Assembly Lot
WL = Wafer Lot
YYWW = Date Code
G
= Pb−Free Package
PIN ASSIGNMENT
VCC3 1
PWRDG 2
ALERT 3
SDA 4
SCL 5
EN 6
GND 7
NC 8
NC 9
IMON 10
IREF 11
RT 12
PIN 1
INDICATOR
NCP4208
TOP VIEW
36 PWM3
35 PWM4
34 PWM5
33 PWM6
32 PWM7
31 PWM8
30 SW1
29 SW2
28 SW3
27 SW4
26 SW5
25 SW6
© Semiconductor Components Industries, LLC, 2009
August, 2009 − Rev. 0
ORDERING INFORMATION
Device*
Package
Shipping^†
NCP4208MNR2G QFN48 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.
1
Publication Order Number:
NCP4208/D