The LTM4676 is a dual step-down µModule® DC/DC regulator featuring remote configurability and telemetry-monitoring of power and power management parameters over PMBus. The device is comprised of fast analog control loops, precision mixedsignal circuitry, EEPROM, power MOSFETs, inductors and supporting components.

The LTM4676 dual 13A or single 26A step-down DC/DC regulator from Linear Technology features a serial digital interface. The interface enables system designers and remote operators to command and supervise a system’s power condition and consumption.

The ability to digitally change power supply parameters reduces time-to-market and down time by eliminating what would have historically required physical hardware, circuit, and/or system bill-of-material modifications. The LTM4676 simplifies system characterization, optimization and data mining during prototyping, deployment and field operation.

Target applications include optical transport systems, datacom and telecom switches and routers, industrial test equipment, robotics, RAID and enterprise systems where the cost of electrical utilities, cooling and maintenance are critical.

In addition to delivering power to a point-of-load, the LTM4676 features configurability and telemetry-monitoring of power and power management parameters over PMBus – an open standard I²C-based digital serial interface protocol.  The LTM4676’s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. Input and output currents and voltages, output power, temperature, uptime and peak values are readable.

The device is comprised of fast, dual analog control loops, precision mixed-signal circuitry, EEPROM, power MOSFETs, inductors and supporting components housed in a 16 x 16 x 5.01mm BGA (ball grid array) package.

Custom configuration of the EEPROM contents is not required. At start-up, output voltages, switching frequency, and channel phase angle assignments can be set by pin-strapping resistors.

With +/-1% maximum DC output error over temperature, +/-2.5% current read back accuracy, integrated 16-bit delta-sigma ADC and EEPROM, the LTM4676 combines best-in-class analog switching regulator performance with precision mixed signal data acquisition.

The LTM4676 operates from a 4.5V to 26.5V input supply and steps down VIN to two outputs ranging from 0.5V up to 5.4V. Two channels can current share to provide up to 26A (i.e.,13A+13A as one output). As many as four LTM4676 devices can be multiphased to share current up to 100A output. At start-up, output voltages, switching frequency and channel phase angle assignments can be set by pin-strapping resistors.

To evaluate the performance of the LTM4676, the LTpowerPlay™ GUI (graphic user interface – free to download), a USB-to-PMBus converter (DC1613) and demo kits are available.

The LTM4676 is offered in a 16mm × 16mm × 5.01mm BGA package available with SnPb or RoHS compliant terminal finish. The internal operating temperature range of this device is from -40ºC to 125ºC. The 1,000-piece price is $33.55 each.

For more information on the LTM4676 visit www.linear.com/product/LTM4676.

Summary of Features of the LTM4676:

  • Dual 13A or Single 26A µModule Regulator with Fast Analog Control Loops & Digital Interface for Remote Power System Management
  • +/-2.5% Current Read Back Accuracy, +/-1% Maximum DC Output Voltage Error Over Temperature
  • 16 x 16 x 5.01mm BGA Package, Includes Inductors, Power MOSFETs, DC/DC Converter, Data Acquisition System & EEPROM

 

Readable Data:

  • Temperature Input & Output Voltages, Input & Output Currents
  • Peak Values, Faults & Warnings
  • Fault Log Record Report

Writable Data:

  • Output Voltage, Voltage Sequencing & Margining
  • Digital Soft-Start/Stop Ramp
  • Overvoltage, Undervoltage, Overtemperature, Warning & Fault Limits, Switching Frequency & Phasing

Hyperlinks:

Demo kit:

http://www.linear.com/demo?demo_board=&part_number=LTM4676

LTpowerPlay:

http://www.linear.com/designtools/software/#LTPowerPlay

 

Typical Application

Applications

System Optimization, Characterization and Data Mining in Prototype, Production and Field Environments

Telecom, Datacom, and Storage Systems

About Linear Technology

Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, µModule products, and many other analog functions.  Applications for Linear Technology’s high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

 

Linear Technology (UK) Limited

Tel: +44 (0)1628 477066

E-mail: uksales@linear.com

Web site: www.linear.com

Website for product information:  http://www.linear.com/product/LTM4676