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ON Semiconductor - Dual Synchronous Buck Controller

Numéro de référence NCP5425
Description Dual Synchronous Buck Controller
Fabricant ON Semiconductor 
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NCP5425 fiche technique
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
ROSC 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
http://onsemi.com
20
1
TSSOP−20
DB SUFFIX
CASE 948E
PIN CONNECTIONS AND
MARKING DIAGRAM
GATEH1
GATEL1
GND
BST
NC
NC
IS+1
IS−1
VFB1
COMP1
1
NCP
5425
ALYW G
G
20
GATEH2
GATEL2
VCC
ROSC
MODE
IS−2
IS+2
VREF2
VFB2
COMP2
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping
NCP5425DB
TSSOP−20* 75 Units/Tube
NCP5425DBG TSSOP−20* 75 Units/Tube
NCP5425DBR2 TSSOP−20* 2500/Tape & Reel
NCP5425DBR2G TSSOP−20* 2500/Tape & 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.
*This package is inherently Pb−Free.
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 9
1
Publication Order Number:
NCP5425/D

PagesPages 22
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