NCP5425 Datasheet, PDF (1/22 Pages) ON Semiconductor – Dual Synchronous Buck Controller

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 volts
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 Volts
• 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 Volt "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
Applications
• DDR Memory Power
• Graphics Cards
http://onsemi.com
20
1
TSSOP−20
DB SUFFIX
CASE 948E
PIN CONNECTIONS AND
MARKING DIAGRAM
1
GATEH1
GATEL1
GND
BST
NC
NC
IS+1
IS−1
V_FB1
COMP1
NCP
5425
AWLYWW
20
GATEH2
GATEL2
V_CC
R_OSC
MODE
IS−2
IS+2
V_REF2
V_FB2
COMP2
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
ORDERING INFORMATION
Device
Package
Shipping^†
NCP5425DB
TSSOP−20 61 Units/Rail
NCP5425DBR2 ^{TSSOP−20} 2500 Units/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, 2005
1
January, 2005 − Rev. 6
Publication Order Number:
NCP5425/D