© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 9
1 Publication Order Number:
NCP5425/D
NCP5425
Dual Synchronous
Buck Controller
The NCP5425 is a highly flexible dual buck controller with internal
gate drivers that can be used with two input power supplies and one or
two outputs in multiple configurations. The part contains all the
circuitry required for two independent synchronous dual NFET buck
regulators utilizing a feed forward voltage mode control method. The
NCP5425 can run from a single supply ranging from 4.6 to 12 V and
support a single two phase or dual single phase outputs. When used as
a dual output controller, the second output tracks voltage transients
from the first. Power blanking for low noise applications is supported
as well as independent cycle−by−cycle current limiting. The part is
available in a 20 pin TSSOP package allowing the designer to
minimize PCB area.
Features
• Operation Over 4.6 to 13.2 V
• Dual Synchronous Buck Design
• Configurable as a Single Two Phase Output or Two Single Phase
Outputs
• Programmable Power Sharing and Budgeting from Two Independent
Supplies
• 0.8 V "1% Reference for Low Voltage Outputs
• 1.5 A Peak Power Drive
• Switch Blanking for Noise Sensitive Applications through use of
R
OSC
Pin
• Programmable Frequency, 150 kHz to 750 kHz Operation
• Programmable Soft−Start
• Cycle−by−Cycle Overcurrent Protection
• Independent Programmable Current Limits
• 100% Duty Cycle for Fast Transient Response
• Internal Slope Compensation
• Out−of−Phase Synchronization between the Controllers
• Input Undervoltage Lockout
• On/Off Enable through use of the COMP Pins
• Power Supply Sequencing
• These are Pb−Free Devices
Applications
• DDR Memory Power
• Graphics Cards
NCP5425DBR2
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
Device Package Shipping
†
ORDERING INFORMATION
NCP5425DB TSSOP−20*
75 Units/Tube
2500/Tape & Ree
PIN CONNECTIONS AND
MARKING DIAGRAM
TSSOP−20
DB SUFFIX
CASE 948E
1
20
1
20
GATEH1
GATEL1
GND
BST
NC
NC
IS+1
IS−1
V
FB1
COMP1
GATEH2
GATEL2
V
CC
R
OSC
MODE
IS−2
IS+2
V
REF2
V
FB2
COMP2
NCP
5425
ALYW G
G
http://onsemi.com
†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.
NCP5425DBR2G
2500/Tape & Ree
NCP5425DBG TSSOP−20*
75 Units/Tube
TSSOP−20*
TSSOP−20*
*This package is inherently Pb−Free.
(Note: Microdot may be in either location)
