DATASHEET ISL68144 FN8888 Rev. 3.00 Digital Dual Output, 4-Phase Configurable, PWM Controller with PMBus for Cavium Feb 8, 2018 The ISL68144 is a digital dual output, flexible multiphase Features (X+Y 4) PWM controller developed to support the latest Advanced linear digital modulation scheme Cavium CN99xx server class processors. The ISL68144 supports the PMBus 1.3 specification and is designed to meet - Zero latency synthetic current control for excellent HF the latest Intel server-class transient performance current balance specifications. Either output can be configured to support any - Dual-edge modulation for fastest transient response desired phase assignments up to a maximum of four phases Auto phase add/drop for excellent load vs efficiency profile across the two outputs (X+Y), such as 3+1, 2+2, 2+1, or even a single output operation as a 4+0 configuration. With full digital PMBus 1.3 support control, this new generation of controllers ushers in design - Telemetry - V , V , I , power IN/OUT, temperature, IN OUT OUT flexibility by supporting any microprocessor, FPGA, or Digital and various fault status registers ASIC rail requirements that include adjustable load setting. - Up to 2MHz bus interface The ISL68144 uses proprietary Renesas linear synthetic digital current modulation scheme to achieve the industrys best Flexible phase configuration combination of transient response and ease of tuning while - 4+0, 3+1, 2+2 phase operation addressing the challenges of modern multiphase designs. - Operation using less than four phases between two outputs is also supported Device configuration and telemetry monitoring is accomplished using the intuitive Renesas PowerNavigator Diode braking for overshoot reduction software. The ISL68144 device supports on-chip, nonvolatile Differential remote voltage sensing supports 0.5% closed memory to store various configuration settings that are loop system accuracy over load, line, and temperature user-selectable through pin-strap, giving system designers increased power density to configure and deploy multiple Highly accurate current sensing for excellent load line configurations. The device supports an automatic phase regulation and accurate OCP add/drop feature to allow maximum efficiency across all load - Supports ISL99227 60A smart power stages ranges. Thresholds for automatic phase add/drop are - Supports DCR sense with integrated temperature user-programmable using PowerNavigator. compensation The ISL68144 supports a comprehensive fault management Comprehensive fault management enables high reliability system to enable the design of highly reliable systems. From a systems multitiered overcurrent protection scheme to the configurable - Pulse-by-pulse phase current limiting power-good and output overvoltage/undervoltage fault - Total output current protection thresholds and temperature monitoring, almost any need is accommodated. - Output and input OV/UV - Open voltage sense detect With minimal external components, easy configuration, robust - Black box recording capability for faults fault management, and highly accurate regulation capability, implementing a high-performance, multiphase regulator has Intuitive configuration using PowerNavigator never been easier. - NVM to store up to eight configurations Applications Pb-Free (RoHS compliant) Networking equipment Related Literature Telecom and datacom equipment For a full list of related documents, visit our website Server and storage equipment - ISL68144 product page Point-of-load power supply (memory, DSP, ASIC, FPGA) FN8888 Rev. 3.00 Page 1 of 48 Feb 8, 2018ISL68144 Table of Contents Ordering Information 3 Pin Configuration 3 Functional Pin Descriptions . 4 Driver, DrMOS, and Smart Power Stage Recommendations 4 Internal Block Diagram . 5 Typical Application: 3+1 Configuration with ISL99227 SPS 6 Typical Application: 2+2 Configuration with ISL99227 SPS 7 Typical Application: 2+2 Configuration with DCR Sensing . 8 Absolute Maximum Ratings . 9 Thermal Information . 9 Recommended Operating Conditions 9 Electrical Specifications . 9 Typical Performance Curves . 11 Functional Description 12 Overview . 12 PWM Modulation Scheme 12 PMBus Address Selection . 12 Phase Configuration . 12 Automatic Phase Add and Drop . 12 Output Voltage Configuration 13 Switching Frequency . 13 Current Sensing . 13 Temperature Sensing 14 Temperature Compensation 14 Lossless Input Current and Power Sensing 15 Voltage Regulation 15 Current Feedback . 16 Power-On Reset (POR) . 16 Soft-Start Delay and Ramp Times 16 Stored Configuration Selection 16 Fault Monitoring and Protection 16 Power-Good Signals 16 Output Voltage Protection 16 Output Current Protection . 17 Smart Power Stage OC Fault Detect 18 Thermal Monitoring (TWARN) and Protection 18 Layout and Design Considerations 19 PMBus Operation . 20 PMBus Protocol 21 PMBus Command Summary 22 PMBus Use Guidelines . 23 PMBus Data Formats 23 PMBus Command Detail . 24 Revision History 46 Package Outline Drawing 47 FN8888 Rev. 3.00 Page 2 of 48 Feb 8, 2018