NCP5424A Datasheet, PDF (1/20 Pages) ON Semiconductor – Dual Synchronous Buck Controller

NCP5424A
Dual Synchronous
Buck Controller with Input
Current Sharing
The NCP5424A is a flexible dual N−channel synchronous buck
controller utilizing V²â„¢ control for fast transient response and
excellent line and load regulation. This highly versatile controller can
be configured as a single two phase output converter that draws
programmable amounts of current from two different input voltages or
all current from one supply. The NCP5424A can also be configured as
two independent out−of−phase controllers.
Using the NCP5424A in a current sharing input configuration is
ideal for applications where more power is required than is available
from one supply, such as video cards or other plug−in boards. When
configured as a dual output controller, the output of one controller can
be divided down and used as the reference for the second controller.
This tracking capability is useful in applications such as Double Data
Rate (DDR) Memory power where the termination voltage must track
VDD.
The NCP5424A provides a cycle−to−cycle current limit allowing
the system to handle transient overcurrent events. In addition, the
NCP5424A provides Soft Start, undervoltage lockout, and built−in
adaptive FET nonoverlap time to prevent shoot through.
Features
• Cycle−to−Cycle Current Limit
• Programmable Soft Start
• 100% Duty Cycle for Enhanced Transient Response
• 150 kHz to 600 kHz Programmable Frequency Operation
• Switching Frequency Set by Single Resistor
• Out−Of−Phase Synchronization Between the Channels Reduces the
Input Filter Requirement
• Undervoltage Lockout
Applications
• Video Graphics Card
• DDR Memory
• High Current (Two−Phase) Power Supplies
• Dual Output DC−DC Converters
http://onsemi.com
16
1
SO−16
D SUFFIX
CASE 751B
PIN CONNECTIONS AND
MARKING DIAGRAM
1
GATE(H)1
GATE(L)1
GND
BST
IS+1
IS−
V_FB1
COMP1
16
GATE(H)2
GATE(L)2
V_CC
R_OSC
IS+2
V_FB+2
V_FB−2
COMP2
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
ORDERING INFORMATION
Device
NCP5424AD
NCP5424ADR2
Package
SO−16
SO−16
Shipping
48 Units/Rail
2500 Tape & Reel
© Semiconductor Components Industries, LLC, 2003
1
August, 2003 − Rev. 0
Publication Order Number:
NCP5424A/D