NCP81040 Datasheet, PDF (1/28 Pages) ON Semiconductor – Programmable Multi-Phase Synchronous Buck Converter

NCP81040
Programmable Multi-Phase
Synchronous Buck
Converter with I²C
Interface
The NCP81040 is an integrated power control IC with an I²C
interface. It combines a highly efficient, multi−phase, synchronous
buck switching regulator controller with an I²C 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.
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 NCP81040 can be
programmed to provide 2−, 3−, or 4−phase operation, allowing for the
construction of up to four complementary buck−switching stages. The
NCP81040 supports PSI, which is a Power Save Mode.
The NCP81040 includes an I²C 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 I²C from the NCP81040.
The NCP81040 operates over the industrial temperature range of
−40°C to +125°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
• I²C 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 Output
• 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, 2015
1
October, 2015 − Rev. 1
www.onsemi.com
1 40
QFN40 6x6
CASE 488AR
MARKING DIAGRAM
NCP81040
AWLYYWWG
A
= Assembly Location
WL = Wafer Lot
YY
= Year
WW = Work Week
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
NCP81040
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^†
NCP81040MNR2G QFN40 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 Specifications
Brochure, BRD8011/D.
Publication Order Number:
NCP81040/D