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CS5305 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. CS5305
Description  Three−Phase Synchronous Switching Step−Down Controller with Single Wire Current Sharing
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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CS5305 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 7
1
Publication Order Number:
CS5305/D
CS5305
Three−Phase Synchronous
Switching Step−Down
Controller with Single
Wire Current Sharing
The CS5305 provides a low−cost, single−controller solution for the
low−voltage, high−current power needs of next−generation
workstation and server processors. This IC provides high accuracy and
the industry’s fastest transient response, reducing the need for large
banks of output capacitors and providing the most compact, reliable,
and economical power supply.
Since each phase’s output voltage and current feed back to develop
the PWM ramp signal (enhanced V2™ control), the CS5305 shares
output current accurately between phases. Accurate current sharing
means that the power supply design does not need to use power
components rated to handle mismatched current per phase. The
enhanced V2 control compensates for variations in both line and load.
The IC’s built−in single wire current sharing capability allows easy
paralleling of multiple Voltage Regulator Modules (VRMs) based on
the CS5305. The paralleled VRMs use a shared bus to provide high
current and high reliability to multiple microprocessor workstations
or servers.
The CS5305 meets VRM 9.x specifications with its Power Good,
Enable, Differential Remote Sense, and single−wire Current Share
features. The product fits server and workstation VRMs, and can be
used to power Embedded Processors. The IC provides the simplest,
lowest−cost solution for any low voltage, high current power supply.
Features
Enhanced V2 Control Method
VRM 9.x Compatible VID Codes
Lossless Inductor Current Sensing
Single Wire Active Current Sharing Between Converters
Auto Master−Slave Current Share Control Method
Programmable 200 to 800 kHz Switching Frequency
Programmable Adaptive Voltage Positioning
Differential Remote Sense
Pulse−by−Pulse Current Limit
Master Hiccup Overcurrent Protection through Single
Wire Share Bus
5−Bit DAC with 1% Tolerance
ENABL Input
VRM 9.x−Compliant Power Good Output
Active Current Sharing During Soft Start
http://onsemi.com
Device
Package
Shipping
ORDERING INFORMATION
SO−28L
27 Units/Rail
SO−28L 1000 Tape & Reel
SO−28L
DW SUFFIX
CASE 751F
1
28
1
28
PWRGDS
IFB
SGND
CSREF
VCC
CS3
DRVON
CS2
GATE3
CS1
GATE2
ENABL
GATE1
ROSC
GND
OCSET
VID0
IOUT
VID1
SHARE
VID3
VDRP
VID2
SCOMP
VID4
VFB
PWRGD
COMP
PIN CONNECTIONS
CS5305GDW28
CS5305GDWR28
MARKING
DIAGRAMS
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W = Work Week
1
CS5305
AWLYYWW
28


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