NCP5424_05 Datasheet, PDF (1/18 Pages) ON Semiconductor – Dual Synchronous Buck Controller with Input Current Sharing

NCP5424
Dual Synchronous
Buck Controller with Input
Current Sharing
The NCP5424 is a flexible dual N−Channel synchronous buck
controller utilizing V²t 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 out−of−phase 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 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 NCP5424 provides a cycle−to−cycle 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 Soft−Start, undervoltage lockout, and built−in adaptive FET
nonoverlap time to prevent shoot through.
Features
• Hiccup Mode Current Limit (Controller 1)
• Cycle−to−Cycle Current Limit (Controller 2)
• 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
• Pb−Free Packages are Available*
Applications
• Video Graphics Card
• DDR Memory
• High Current (Two−Phase) Power Supplies
• Dual Output DC−DC Converters
http://onsemi.com
16
1
SOIC−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
Package
Shipping^†
NCP5424D
SOIC−16
48 Units/Rail
NCP5424DG
NCP5424DR2
SOIC−16
(Pb−Free)
SOIC−16
48 Units/Rail
2500 Tape & Reel
NCP5424DR2G SOIC−16 2500 Tape & Reel
(Pb−Free)
†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.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
1
March, 2005 − Rev. 4
Publication Order Number:
NCP5424/D