NCP81172 Datasheet, PDF (1/14 Pages) ON Semiconductor – 2-Phase Synchronous Buck Controller

NCP81172
2-Phase Synchronous Buck
Controller with Integrated
Gate Drivers and PWM VID
Interface
The NCP81172, a general−purpose two−phase synchronous buck
controller, integrates gate drivers and PWM VID interface in a
QFN−24 package and provides a compact−footprint power
management solution for new generation computing processors. It
receives power save command (PSI) from processors and operates in
1−phase diode emulation mode to obtain high efficiency in light−load
condition. Operating in high switching frequency up to 800 kHz
allows employing small size inductor and capacitors. The part is able
to support all−ceramic−capacitor applications.
Features
 4.5 V to 24 V Input Voltage Range
 Output Voltage up to 2.0 V with PWM VID Interface
 Differential Output Voltage Sense
 Integrated Gate Drivers
 200 kHz ~ 800 kHz Switching Frequency
 Power Saving Interface (PSI)
 Power Good Output
 Programmable Over Current Protection
 Over Voltage Protection
 Under Voltage Protection
 Temperature Sense and Alert Output
 Thermal Shutdown Protection
 QFN−24, 4 x 4 mm, 0.5 mm Pitch Package
 This is a Pb−Free Device
Typical Applications
 GPU and CPU Power
 Graphics Card Applications
 Desktop and Notebook Applications
http://onsemi.com
1 24
QFN24
CASE 485L
MARKING DIAGRAM
81172
ALYWG
G
81172
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PINOUT
18 17 16 15 14 13
19 PH2
20 LG2
21 PVCC
22 PGND
23 LG1
24 PH1
25
GND
COMP 12
FB 11
FBRTN 10
FS 9
VREF 8
REFIN 7
123456
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP81172MNTXG QFN24 4000 / Tape &
(Pb−Free)
Reel
†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, 2013
1
April, 2013 − Rev. 1
Publication Order Number:
NCP81172/D