PDF《DATASHEET》

FN8704 Rev.

4.00 Nov 9,

2017 ISL8273M 80A Single Channel Digital PMBus Step-Down Power Module DATASHEET FN8704 Rev.4.00 Page

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2017 The ISL8273M is a complete PMBus enabled DC/DC single channel step-down advance power supply capable of delivering up to 80A of current and optimized for high power density applications. For higher output current, up to four ISL8273Ms can be paralleled to supply up to 320A in a multiphase current sharing configuration. Operating over an input voltage range of 4.5V to 14V, the ISL8273M offers adjustable output voltages down to 0.6V and achieves up to 93% conversion efficiencies. A unique ChargeMode? control architecture provides a single clock cycle response to an output load step and can support switching frequencies up to 1MHz. The power module integrates all power and most passive components and requires only a few external components to operate. A set of optional external resistors allows the user to easily configure the device for standard operation. For advanced configurations, a standard PMBus interface addresses sequencing and fault management, as well as real-time full telemetry and point-of-load monitoring. Additionally, on-board nonvolatile memory can store the desired custom configuration and settings. A fully customizable voltage, current, and temperature protection scheme ensures safe operation for the ISL8273M under abnormal operating conditions. The device is also supported by the PowerNavigator? software, a full digital power train development environment. The ISL8273M is available in a low profile compact 18mmx23mmx7.5mm fully encapsulated thermally enhanced HDA package. Applications ? Server, telecommunications, storage, and data communications ? Industrial/ATE and networking equipment ? General purpose power for ASIC, FPGA, DSP, and memory Features ? Complete digital power supply ? 80A single channel output current - 4.5V to 14V single rail input voltage - Up to 93% efficiency - Up to 320A/4 parallel modules capable solution - Multiphase and current sharing operations (180°/22.5° steps) ? Programmable output voltage - 0.6V to 2.5V output voltage settings - ±1% accuracy over line, load, and temperature ? ChargeMode control loop architecture - 296kHz to 1.06MHz fixed switching frequency operations - No compensation required - Fast single clock cycle transient response ? PMBus interface and/or pin-strap mode - Fully programmable through PMBus - Pin-strap mode for standard settings - Real-time telemetry for VIN, VOUT, IOUT, temperature, duty cycle, and fSW ? Advanced soft-start/stop, sequencing, and margining ? On-board nonvolatile memory ? Complete over/undervoltage, current, and temperature protections with fault logging ? PowerNavigator supported ? Thermally enhanced 18mmx23mmx7.5mm HDA package Related Literature ? For a full list of related documents, visit our website - ISL8273M product page FIGURE 1. 80A APPLICATION CIRCUIT FIGURE 2. A SMALL PACKAGE FOR HIGH POWER DENSITY VIN VDD VR55 VR5 VR VOUT SGND PGND VR6 VDRV SCL SDA SALRT VMON VCC VDRV1 VSENP VSENN VIN CIN ISL8273M VOUT PMBUS INTERFACE COUT 2x10?F 10?F 10?F EN ENABLE 6.65k?? 100k?? PG NOTE: Figure

1 represents a typical implementation of the ISL8273M. For PMBus operation, it is recommended to tie the enable pin (EN) to SGND. 23m m 18mm 7.5mm ISL8273M FN8704 Rev.4.00 Page

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2017 Table of Contents Ordering Information

3 Pin Configuration.3 Pin Descriptions.4 ISL8273M Internal Block Diagram

6 Typical Application Circuit - Single Module

7 Typical Application Circuit - Three Module Current Sharing