© Semiconductor Components Industries, LLC, 2013
September, 2013 − Rev. 5
1 Publication Order Number:
NCP4208/D
NCP4208
VR11.1 Digital
Programmable 8-Phase
Synchronous Buck
Converter with I
2
C
Interface
The NCP4208 is an integrated power control IC with an I
2
C 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 I
2
C 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
PIN ASSIGNMENT
Device Package Shipping
†
ORDERING INFORMATION
NCP4208MNR2G QFN48
(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 Specifications
Brochure, BRD8011/D.
MARKING DIAGRAM
NCP4208
AWLYYWWG
QFN 48
CASE 485AJ
A = Assembly Lot
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
2
PWRDG PWM4
35
1
VCC3 PWM3
36
4
SDA
PWM6
33
NC
9
SW3
28
10
IMON
SW4
27
11
IREF
SW5
26
RT
12 SW625
3 PWM534
ALERT
5
SCL
32 PWM7
6
EN
31
PWM8
NC
829
SW2
730
GND
SW1
14
FBRTN VID0
47
13
RAMPADJ PSI
48
16
FB VID2
45
21
VID7
40
22
VCC
39
23
SW8 PWM1
38
SW7
24
PWM2
37
15
VID1
46
COMP
ODN
17
CSREF
44
VID3
18
CSSUM
43
VID4
ILIMIFS
20 41
VID6
19 42
CSCOMP VID5
OD1
NCP4208
TOP VIEW
PIN 1
INDICATOR
148
