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CS5305
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 V2 ™ control), the CS5305 shares
output current accurately between phases. Accurate current sharing
means that the power supply design does not need to use
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 V oltage Regulator Modules (VRMs) based on
the CS5305. The paralleled VRMs use a shared bus to provide highcurrent 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 V oltage 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
