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reference designLTM4681 | Demoboard DC3082A-A

Analog Devices LTM4681 | Demoboard DC3082A-A

PolyPhase Single Output Step-Down μModule Regulator with Digital PSM: 2 × LTM4681 at 240A

Overview

TopologyBuck Converter
Input voltage4.5-16 V
Output 11 V / 240 A

Description

Demonstration circuit 3082A-A features the LTM4681: the wide input and output voltage range, high efficiency and power density, high current PolyPhase® single output DC/DC step-down μModule® regulator with digital power system management. DC3082A-A is configured as 8-phase single output using 2 × LTM4681. The factory default input voltage is 12V typical, output voltage is 1V at 240A typical or 250A peak with recommended 400LFM forced airflow. The demo board output voltages can be adjusted from 0.6V to 1V. Programming the output voltages to any value that is greater than 1V, requires derating output current based on thermal derating curves provided in the data sheet of the LTM4681. Heat sink or other appropriate electronic cooling systems can also be used in conjunction with forced airflow to further optimize the output power when the output is on and loaded with maximum output current. The factory default switching frequency is preset at 350kHz typical. DC3082A-A comes with PMBus interface and digital power system management functions. An onboard 12-pin connector is available for users to connect the dongle DC1613A to the demo board, provides an easy way to communicate and program the part using LTpowerPlay® software development tool. LTpowerPlay software and I2C/PMBus/SMBus dongle DC1613A allows users to monitor real time telemetry of input and output voltages, input and output current, switching frequency, internal IC die temperatures, power stage component temperatures and fault logs. Programmable parameters include device address, output voltages, control loop compensation, switching frequency, phase interleaving, DCM or CCM Mode of operation, digital soft-start, sequencing, and time based shutdown, fault responses to input and output overvoltage, output overcurrent, IC die and power component overtemperatures.The LTM4681 is available in a thermally enhanced, low profile 330-Lead (15mm × 22mm × 8.17mm) BGA package. It is recommended to read the data sheet and demo manual of LTM4681 prior to using or making any hardware changes to DC3082A-A.

Features

  • Quad Digitally Adjustable Analog Loops with Digital Interface for Control and Monitoring
  • Wide Input Voltage Range: 4.5V to 16V
  • Output Voltage Range: 0.5V to 3.3V
  • ±0.5% Maximum DC Output Error Over Temperature
  • ±4% Current Readback Accuracy: 0°C to 125°C
  • Integrated Input Current Sense Amplifier
  • 400kHz PMBus-Compliant I2C Serial Interface
  • Supports Telemetry Polling Rates Up to 125Hz
  • Integrated 16-Bit ΔΣ ADC
  • Parallel and Current Share Multiple Modules
  • 15mm × 22mm × 8.17mm BGA Package
  • Readable Data:
  • Input and Output Voltages, Currents, and Temperatures
  • Running Peak Values, Uptime, Faults and Warnings
  • Onboard EEPROM Fault Log Record
  • Writable Data and Configurable Parameters:
  • Output Voltage, Voltage Sequencing and Margining
  • Digital Soft-Start/Stop Ramp, Program Analog Loop
  • OV/UV/OT, UVLO, Frequency and Phasing

Typical applications

  • Multi-Rail Processor Power, Configurable Core Power

More information

Parts approved by Analog Devices

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f(mm)
λDom typ.(nm)
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λPeak typ.(nm)
IV typ.(mcd)
VF typ.(V)
Chip Technology
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L(mm)
H(mm)
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150060RS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, –, 625 nm
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Downloads27 files

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iProduction is active. Expected lifetime: >10 years.
Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear
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Dominant Wavelength [typ.]625 nm
Emitting ColorRed 
Peak Wavelength [typ.]630 nm
Luminous Intensity [typ.]250 mcd
Forward Voltage [typ.]2 V
Chip TechnologyAlInGaP 
Viewing Angle Phi 0° [typ.]140 °
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–
MountSMT 
Length1.6 mm
Height0.7 mm
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Operating Temperature -40 °C up to +85 °C
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150060GS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, –, 525 nm
Simu­lation
Availability
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Downloads27 files

RAY files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear
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Dominant Wavelength [typ.]525 nm
Emitting ColorGreen 
Peak Wavelength [typ.]515 nm
Luminous Intensity [typ.]430 mcd
Forward Voltage [typ.]3.2 V
Chip TechnologyInGaN 
Viewing Angle Phi 0° [typ.]140 °
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–
MountSMT 
Length1.6 mm
Height0.7 mm
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Operating Temperature -40 °C up to +85 °C
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702935000
SPECWA-SNSR Self-Retaining Spacer, 4.8 mm, –
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Downloads3 files

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iProduction is active. Expected lifetime: >10 years.
Product seriesWA-SNSR Self-Retaining Spacer
Drilling in Panel4.8 mm
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Length12.7 mm
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Operating Temperature -30 °C up to +85 °C
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60800213421
SPECWR-PHD Jumper, –, –
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iProduction is active. Expected lifetime: >10 years.
Product seriesWR-PHD Jumper
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Pins2 
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Rated Current3 A
Working Voltage200 V (AC)
Operating Temperature -25 °C up to +105 °C
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62000311121
SPECWR-PHD Pin Header, –, –
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iProduction is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
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Pins3 
TypeStraight 
MountTHT 
Length6 mm
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Rated Current2 A
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C
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