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Semiconductor Components Industries, LLC, 2005
March, 2005 Rev. 4
1
Publication Order Number:
NCP5424/D
NCP5424
Dual Synchronous
Buck Controller with Input
Current Sharing
The NCP5424 is a flexible dual NChannel synchronous buck
controller utilizing V
2
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 NCP5424 can also be configured as
two independent outofphase controllers.
Using the NCP5424 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 plugin 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 NCP5424 provides a cycletocycle current limit on
Controller 2 allowing the system to handle transient overcurrent
events and a hiccup mode overcurrent protection on Controller 1
allowing lossless short circuit protection. In addition, the NCP5424
provides SoftStart, undervoltage lockout, and builtin adaptive FET
nonoverlap time to prevent shoot through.
Features
Hiccup Mode Current Limit (Controller 1)
CycletoCycle Current Limit (Controller 2)
Programmable SoftStart
100% Duty Cycle for Enhanced Transient Response
150 kHz to 600 kHz Programmable Frequency Operation
Switching Frequency Set by Single Resistor
OutOfPhase Synchronization Between the Channels Reduces the
Input Filter Requirement
Undervoltage Lockout
PbFree Packages are Available*
Applications
Video Graphics Card
DDR Memory
High Current (TwoPhase) Power Supplies
Dual Output DCDC Converters
*For additional information on our PbFree strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
http://onsemi.com
SOIC16
D SUFFIX
CASE 751B
A
WL = Wafer Lot
Y
= Year
WW = Work Week
= Assembly Location
V
FB1
COMP1
IS+1
IS
GATE(H)1
GATE(L)1
PIN CONNECTIONS AND
MARKING DIAGRAM
GND
BST
1
16
GATE(H)2
GATE(L)2
V
CC
R
OSC
IS+2
V
FB+2
V
FB2
COMP2
A
N
16
1
NCP5424DR2
Device
Package
Shipping
ORDERING INFORMATION
NCP5424D
SOIC16
48 Units/Rail
SOIC16
2500 Tape & Reel
NCP5424DG
SOIC16
(PbFree)
48 Units/Rail
NCP5424DR2G
SOIC16
(PbFree)
2500 Tape & Reel
For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.