µModule regulator is PMBus-compatible

11th June 2015
Siobhan O'Gorman

A dual 9A or single 18A µModule step-down DC/DC regulator with PMBus serial digital interface has been introduced by Linear Technology. The LTM4675 features an I²C-based interface, which enables system designers and remote operators to command and supervise a system’s power condition and consumption. 

The device includes EEPROM, power MOSFETs, inductors and supporting components. It has fast, dual analogue control loops and precision mixed-signal circuitry. The regulator is drop-in pin-compatible with the larger, higher power dual 13A LTM4676A, eliminating layout changes so that system designers can easily switch between the devices during the prototype phase. This eliminates the redesign of power circuits if power requirements change during board prototyping. The LTM4675 has applications in optical transport systems, datacomms and telecomms switches and routers, industrial test equipment, robotics, RAID and enterprise systems where energy costs, cooling and maintenance are critical and must be continuously and precisely measured.

The device operates from a 4.5 to 17V input supply and steps down VIN to two outputs ranging from 0.5 up to 5.5V. Two channels can current share to provide up to 18A. Power-up turn-on time is 70ms. To evaluate the performance of the regulator, the free LTpowerPlay GUI-based development system is available for download. A USB-to-PMBus converter and demo kit are also available. With ±0.5% maximum DC output error over temperature, ±2.5% current readback accuracy, integrated 16-bit delta-sigma ADC and EEPROM, the LTM4675 combines outstanding analogue switching regulator performance with precision mixed-signal data acquisition. At start-up, output voltages, switching frequency and channel phase angle assignments can be set by pin-strapping resistors.

The LTM4675, which operates from -40 to 125°C is priced at $24.00 each and sold in 1,000-piece quantities.

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