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CS5305 Datasheet

Three-Phase Synchronous Switching Step-Down Controller

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CS5305
Three−Phase Synchronous
Switching Step−Down
Controller with Single
Wire Current Sharing
The CS5305 provides a lowcost, singlecontroller solution for the
lowvoltage, highcurrent power needs of nextgeneration
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 V2control), 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 builtin 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 singlewire Current Share
features. The product fits server and workstation VRMs, and can be
used to power Embedded Processors. The IC provides the simplest,
lowestcost 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 MasterSlave Current Share Control Method
Programmable 200 to 800 kHz Switching Frequency
Programmable Adaptive Voltage Positioning
Differential Remote Sense
PulsebyPulse Current Limit
Master Hiccup Overcurrent Protection through Single
Wire Share Bus
5Bit DAC with 1% Tolerance
ENABL Input
VRM 9.xCompliant Power Good Output
Active Current Sharing During Soft Start
http://onsemi.com
MARKING
DIAGRAMS
28
28
1
SO28L
DW SUFFIX
CASE 751F
CS5305
AWLYYWW
1
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
1
OCSET
ROSC
ENABL
CS1
28GND
GATE1
GATE2
GATE3
CS2
CS3
CSREF
IFB
IOUT
SHARE
SCOMP
VDRP
VFB
COMP
DRVON
VCC
SGND
PWRGDS
VID0
VID1
VID2
VID3
VID4
PWRGD
ORDERING INFORMATION
Device
Package
Shipping
CS5305GDW28
SO28L 27 Units/Rail
CS5305GDWR28 SO28L 1000 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 7
1
Publication Order Number:
CS5305/D


  ON Semiconductor Electronic Components Datasheet  

CS5305 Datasheet

Three-Phase Synchronous Switching Step-Down Controller

No Preview Available !

+12 V
0.1 μF
220 k
GND
CS5305
APPLICATION DIAGRAMS
5.6 V
270 nH
100
×5
μF
BAS40LT1
6.2 V
20 Ω
2.2 μF
1 μF
NCP5351
NTD
4302
×2
470 nH
NTD
4302
×2
V10OUμTF
×3
ENABLE
3k
47 nF
×3
12 k
×3
28.7 k
20 k
47 nF
3.9 k
12 k
.01 μF
22 nF
91 k
OCSET
GND
ROSC
ENABL
GATE1
GATE2
CS1 GATE3
CS2 DRVON
CS3
VCC
CSREF
SGND
IFB PWRGDS
IOUT
VID0
SHARE
VID1
SCOMP
VID2
VDRP
VID3
VFB
VID4
COMP PWRGD
0.1 μF
17 k
220 Ω
220 Ω
BAS40LT1
1 μF
NCP5351
NTD
4302
×2
NTD
4302
×2
1 μF
BAS40LT1
NCP5351
NTD
4302
×2
.47 nF
NTD
4302
×2
VID4
VID3
VID2
VID1
VID0
GND SENSE
POWERGOOD
VOUT SENSE
SHARE
60.4 k
Figure 1. VRM 9.0, 60 A Converter
http://onsemi.com
2


Part Number CS5305
Description Three-Phase Synchronous Switching Step-Down Controller
Maker ON Semiconductor
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CS5305 Datasheet PDF






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