17mm DATASHEET ISL8278M FN8924 Rev.1.00 Digital DC/DC PMBus 33A Module Aug 17, 2017 The ISL8278M is a 33A step-down, DC/DC power supply module Features with an integrated digital PWM controller, synchronous power Complete digital switch-mode power supply switches, an inductor, and passives. Only bulk input and output capacitors are needed to finish the design. The 33A of -Wide V range: 4.5V to 14V IN continuous output current can be delivered without the need -Programmable V range: 0.6V to 5V OUT for airflow or a heatsink. The thermally enhanced HDA module 2 PMBus compliant I C communication interface is capable of dissipating heat directly into the PCB. -Programmable V , margining, UV/OV, I limit, OUT OUT The ISL8278M uses ChargeMode control architecture, which soft-start/stop, sequencing, and external synchronization responds to a transient load within a single switching cycle. - Monitor: V , V , I , temperature, duty cycle, IN OUT OUT The ISL8278M comes with a preprogrammed configuration for switching frequency, and faults operating in a pin-strap mode. Output voltage, switching frequency, and the device SMBus address can be programmed ChargeMode control architecture with external resistors. More configurations, such as soft-start 1.0% V accuracy over line, load, and temperature OUT and fault limits can be easily programmed or changed using a Power-good indicator PMBus compliant serial bus interface. PMBus can be used to Over-temperature protection monitor voltages, current, temperatures, and fault status. The Internal nonvolatile memory and fault logging ISL8278M is supported by the PowerNavigator software, a Graphical User Interface (GUI) that can be used to configure Patented thermally enhanced HDA package modules for a desired solution. Intuitive configuration using PowerNavigator The ISL8278M is available in a 41 Ld compact 17mmx19mm Applications HDA module with a very low profile height of 3.6mm, suitable for automated assembly by standard surface mount Server, telecom, storage, and datacom equipment. The ISL8278M is RoHS compliant by exemption. Industrial/ATE and networking equipment General purpose power for ASIC, FPGA, DSP, and memory Related Literature For a full list of related documents, visit our website - ISL8278M product page V V VIN VOUT IN OUT C VSEN+ IN VDD C VSEN- OUT VDRVIN VDRVOUT VR55 ISL8278M 10F 10F 10F VCC 3.6mm SCL SDA ENABLE EN SALRT SGND PGND NOTE: 1. Only bulk input and output capacitors are required to finish the design. FIGURE 1. A COMPLETE DIGITAL SWITCH-MODE POWER SUPPLY FIGURE 2. A SMALL PACKAGE FOR HIGH POWER DENSITY FN8924 Rev.1.00 Page 1 of 56 Aug 17, 2017 19mm PMBUS INTERFACEISL8278M Table of Contents Ordering Information 3 Pin Configuration 4 Pin Descriptions . 4 ISL8278M Internal Block Diagram . 6 Absolute Maximum Ratings . 7 Thermal Information . 7 Recommended Operating Conditions 7 Electrical Specifications . 7 Typical Performance Curves . 10 Efficiency Performance . 10 Transient Response Performance 11 Derating Curves . 12 Typical Application Circuit . 14 Functional Description 16 SMBus Communications 16 Output Voltage Selection . 16 Soft-Start Delay and Ramp Times 16 Power-Good 17 Switching Frequency and PLL . 17 Loop Compensation . 17 Input Undervoltage Lockout (UVLO) . 18 SMBus Module Address Selection 18 Output Overvoltage Protection . 18 Output Prebias Protection 19 Output Overcurrent Protection . 19 Thermal Overload Protection 20 Digital-DC Bus 20 Phase Spreading 20 Output Sequencing 20 Fault Spreading . 20 Monitoring Through SMBus . 20 Snapshot Parameter Capture . 20 Nonvolatile Memory . 20 PCB Layout Guidelines 21 Thermal Considerations . 22 Package Description . 22 PCB Layout Pattern Design . 22 Thermal Vias 22 Stencil Pattern Design . 22 Reflow Parameters 22 PMBus Command Summary 23 PMBus Data Formats 27 PMBus Use Guidelines 27 Summary 27 PMBus Commands Description . 28 Datasheet Revision History 49 Firmware Revision History . 49 About Intersil 49 Package Outline Drawing 50 FN8924 Rev.1.00 Page 2 of 56 Aug 17, 2017