1 m 7 m DATASHEET ISL8270M FN8635 Rev.4.00 Digital DC/DC PMBus 25A Module Aug 17, 2017 The ISL8270M is a 25A 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 25A 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 ISL8270M 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 ISL8270M 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 monitor voltages, current, temperatures, and fault status. The Over-temperature protection ISL8270M is supported by PowerNavigator software, a Internal nonvolatile memory and fault logging Graphical User Interface (GUI) that can be used to configure Patented thermally enhanced HDA package modules to a desired solution. Intuitive configuration using PowerNavigator The ISL8270M is available in a 40 Ld compact 17mmx19mm HDA module with very low profile height of 3.55mm, suitable Applications for automated assembly by standard surface mount equipment. The ISL8270M is RoHS compliant by exemption. Server, telecom, storage, and datacom Industrial/ATE and networking equipment Related Literature General purpose power for ASIC, FPGA, DSP, and memory For a full list of related documents, visit our website - ISL8270M product page V V V V IN IN OUT OUT C V IN SEN+ V DD C V OUT SEN- 2.2 ISL8270M V DRVIN SCL 3.55mm V DRVOUT SDA 1 10 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 FN8635 Rev.4.00 Page 1 of 56 Aug 17, 2017 NOT RECOMMENDED FOR NEW DESIGNS RECOMMENDED REPLACEMENT PART ISL8277M 19mm PMBUS INTERFACEISL8270M Table of Contents Ordering Information 3 Firmware Revision History 3 Pin Configuration 4 Pin Descriptions . 4 ISL8270M 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 Derating Curves . 13 Typical Application Circuit . 14 Functional Description 16 SMBus Communications 16 Output Voltage Selection . 16 Soft-Start Delay and Ramp Times 16 Power-Good 16 Switching Frequency and PLL . 17 Loop Compensation . 17 Input Undervoltage Lockout (UVLO) . 17 SMBus Module Address Selection 17 Output Overvoltage Protection . 18 Output Prebias Protection 18 Output Overcurrent Protection . 18 Thermal Overload Protection 18 Digital-DC Bus 19 Phase Spreading 19 Output Sequencing 19 Fault Spreading . 19 Temperature Monitoring Using XTEMP Pin . 19 Monitoring Using SMBus 19 Snapshot Parameter Capture . 20 Nonvolatile Memory . 20 PCB Layout Guidelines 20 Thermal Considerations . 21 Package Description . 21 PCB Layout Pattern Design . 21 Thermal Vias 21 Stencil Pattern Design . 21 Reflow Parameters 21 PMBus Command Summary 22 PMBus Data Formats 25 PMBus Use Guidelines 26 Summary 26 PMBus Commands Description . 26 Revision History 49 About Intersil 49 Package Outline Drawing 50 FN8635 Rev.4.00 Page 2 of 56 Aug 17, 2017