CS5305 Datasheet, PDF (1/33 Pages) ON Semiconductor – Three−Phase Synchronous Switching Step−Down Controller with Single Wire Current Sharing

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 V²â„¢ 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
MARKING
DIAGRAMS
28
28
1
SO−28L
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
R_OSC
ENABL
CS1
28
GND
GATE1
GATE2
GATE3
CS2
CS3
CS_REF
I_FB
I_OUT
SHARE
SCOMP
V_DRP
V_FB
COMP
DRVON
V_CC
SGND
PWRGDS
V_ID0
V_ID1
V_ID2
V_ID3
V_ID4
PWRGD
ORDERING INFORMATION
Device
Package
Shipping
CS5305GDW28
SO−28L 27 Units/Rail
CS5305GDWR28 SO−28L 1000 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 7
Publication Order Number:
CS5305/D