NCP81274 Datasheet, PDF (1/26 Pages) ON Semiconductor – Phase Buck Controller

NCP81274
8/7/6/5/4/3/2/1 Phase Buck
Controller with PWM_VID
and I²C Interface
The NCP81274 is a multiphase synchronous controller optimized
for new generation computing and graphics processors. The device is
capable of driving up to 8 phases and incorporates differential voltage
and phase current sensing, adaptive voltage positioning and
PWM_VID interface to provide and accurately regulated power for
computer or graphic controllers. The integrated power saving
interface (PSI) allows for the processors to set the controller in one of
three modes, i.e. all phases on, dynamic phases shedding or fixed low
phase count mode, to obtain high efficiency in light-load conditions.
The dual edge PWM multiphase architecture ensures fast transient
response and good dynamic current balance.
Features
• Compliant with NVIDIA^® OVR4+ Specifications
• Supports Up to 8 Phases
• 4.5 V to 20 V Supply Voltage Range
• 250 kHz to 1.2 MHz Switching Frequency (8 Phase)
• Power Good Output
• Under Voltage Protection (UVP)
• Over Voltage Protection (OVP)
• Over Current Protection (OCP)
• Per Phase Over Current Protection
• Startup into Pre-Charged Loads while Avoiding False OVP
• Configurable Adaptive Voltage Positioning (AVP)
• High Performance Operational Error Amplifier
• True Differential Current Balancing Sense Amplifiers for Each
Phase
• Phase-to-Phase Dynamic Current Balancing
• Current Mode Dual Edge Modulation for Fast Initial Response to
Transient Loading
• Power Saving Interface (PSI)
• Automatic Phase Shedding with User Settable Thresholds
• PWM_VID and I²C Control Interface
• Compact 40 Pin QFN Package (5 × 5 mm Body, 0.4 mm Pitch)
• This Device is Pb-Free and is RoHS Compliant
Typical Applications
• GPU and CPU Power
• Graphic Cards
• Desktop and Notebook Applications
www.onsemi.com
1 40
QFN40
CASE 485CR
MARKING DIAGRAM
1
ON
NCP
81274
AWLYYWWG
G
NCP81274 = Specific Device Code
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G
= Pb-Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
REFIN 1
VREF 2
VRMP ³
PWM8/SS 4
PWM7/OCP 5
PWM6/LPC1 6
PWM5/LPC2 7
PWM4/PHTH1 ⁸
PWM3/PHTH2 9
PWM2/PHTH3 10
NCP81274
(TOP VIEW)
Tab: GROUND
30 COMP
29 FB
28 DIFF
27 FSW
26 LLTH/I2C_ADD
25 IOUT
24 ILIM
23 CSCOMP
22 CSSUM
21 CSREF
ORDERING INFORMATION
Device
NCP81274MNTXG
Package
Shipping^†
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 Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2015
1
September, 2016 − Rev. 11
Publication Order Number:
NCP81274/D