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The Primarion® PX3520 is a high performance powerstage for the highest power density server and workstaTIonbuck regulaTIon soluTIons. The PX3520 combined with thePrimarion® PX3535 or PX3538 Digital MulTIphaseControllers offers a complete high current, small form factorsolution with superior accuracy, transient response, andprotection features.The PX3520 integrates a low RDSon high-side P-ChannelMOSFET together with both high-side and low-sideMOSFET drivers. The integration of the high-side powerFET with high- and low-side drivers minimizes switchinglosses while providing industry leading power density. Atan upper limit duty cycle of 20%, PX3520 can support amaximum average output current of 30A per phase in anarea less than 16 mm2, smaller than most discrete powerMOSFETs. The PX3520 low-side driver supply (VDRIVE)may be biased separately from the VCC supply from 5V to12V to optimize system efficiency.The PX3520 has a patent pending lossless current sensorwhich accurately senses the current in the high-side FETindependent of VID, inductor value, supply, temperature,and switching frequencies. This integrated current sensemethod provides the accuracy of precision resistor basedsensing with no efficiency loss.The PX3520 has an integrated high-side FET short detectorwhich reacts rapidly on startup to protect the processorbefore the controller is powered up. The output high-sideshort pins from each phase can drive a single externalcrowbar circuitry for rapid protection from a high-side shorton any phase of a multiphase solution. The high-side shortpin also acts as an input, detecting alert signals from everyPX3520 power stage in the system and protecting eachpower stage internally.The PX3520 also has an integrated junction temperaturesensor which provides an on-die measurement of the highsideFET temperature. When used with the Primarioncontrollers, this feature provides accurate, programmableover-temperature protection.The PX3520 uses CSP packaging to provide the lowestthermal resistance and smallest footprint. A relaxed 0.65mm ball pitch allows for easy assembly.
