LTM4681
Info : RECOMMENDED FOR NEW DESIGNS
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LTM4681

Quad 31.25A or Single 125A μModule Regulator with Digital Power System Management

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $131.72
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
Additional Details
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The LTM4681 is a quad 31.25A or single 125A stepdown μModule® (power module) DC/DC regulator featuring remote configurability and telemetry-monitoring of power management parameters over PMBus. The LTM4681 is comprised of digitally programmable analog control loops, precision mixed-signal circuitry, EEPROM, power MOSFETs, inductors and supporting components.

The LTM4681’s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. True input current sense, output currents and voltages, output power, temperatures, uptime and peak values are readable. 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 pinstrapping resistors. The LTpowerPlay® GUI and DC1613 USB-to-PMBus converter and demo kits are available. 

The LTM4681 is offered in a 15mm × 22mm × 8.17mm BGA package available with SnPb or RoHS compliant terminal finish.

APPLICATIONS

  • Multi-Rail Processor Power, Configurable Core Power
Part Models 2
1ku List Price Starting From $131.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Nov 9, 2023

- 23_0232

New tray design for LTM4681

Nov 22, 2022

- 22_0262

Notification of Wafer Fab Location Change for 0.6µm BiCMOS Process

Sep 13, 2022

- 22_0193

Laser Top Mark Conversion for uModule COP and TMSV_COP Packages

LTM4681EY#PBF

PRODUCTION

LTM4681IY#PBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Nov 9, 2023

- 23_0232

arrow down

New tray design for LTM4681

Nov 22, 2022

- 22_0262

arrow down

Notification of Wafer Fab Location Change for 0.6µm BiCMOS Process

Sep 13, 2022

- 22_0193

arrow down

Laser Top Mark Conversion for uModule COP and TMSV_COP Packages

LTM4681EY#PBF

PRODUCTION

LTM4681IY#PBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 4

reference details image

DC3082A-A

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

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DC3082A-A

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

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

Product Detail

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.

LTpowerPlay software can be downloaded here.

USB to PMBus Controller Dongle DC1613A for use with LTpowerPlay is available here.

reference details image

DC3082A-C

LTM4681 Demo Board | PolyPhase Single Output Step-Down µModule Regulator with Digital PSM: 4 × LTM4681 at 480A

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DC3082A-C

LTM4681 Demo Board | PolyPhase Single Output Step-Down µModule Regulator with Digital PSM: 4 × LTM4681 at 480A

LTM4681 Demo Board | PolyPhase Single Output Step-Down µModule Regulator with Digital PSM: 4 × LTM4681 at 480A

Product Detail

Demonstration circuit DC3082A-C 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-C is configured as 16-phase single output using 4× LTM4681. The factory default input voltage is 12V typical, output voltage is 1V at 480A typical or 500A 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-C 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 overtemperature.

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 the demo manual of LTM4681 prior to use or making any hardware changes to DC3082A-C.

LTpowerPlay software can be downloaded here.

USB to PMBus Controller Dongle DC1613A for use with LTpowerPlay is available here.

reference details image

DC3082A-B

LTM4681 | PolyPhase Single Output Step-Down μModule Regulator with Digital PSM: 3 × LTM4681 at 360A

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DC3082A-B

LTM4681 | PolyPhase Single Output Step-Down μModule Regulator with Digital PSM: 3 × LTM4681 at 360A

LTM4681 | PolyPhase Single Output Step-Down μModule Regulator with Digital PSM: 3 × LTM4681 at 360A

Product Detail

Demonstration circuit 3082A-B features the LTM4681: the wide input and output voltage range, high efficiency and power density, high current PolyPhase® single out-put DC/DC step-down μModule® regulator with digital power system management. DC3082A-B is configured as 12-phase single output using 3 × LTM4681. The factory default input voltage is 12V typical, output voltage is 1V at 360A typical or 375A 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 appro-priate 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-B 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 use or making any hardware changes to DC3082A-B.

LTpowerPlay software can be downloaded here.

USB to PMBus Controller Dongle DC1613A for use with LTpowerPlay is available here.

reference details image

DC2924A

LTM4681 | Quad 30A(-A) or Single 120A(-B) μModule Regulator with Digital Power System Management

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DC2924A

LTM4681 | Quad 30A(-A) or Single 120A(-B) μModule Regulator with Digital Power System Management

LTM4681 | Quad 30A(-A) or Single 120A(-B) μModule Regulator with Digital Power System Management

Product Detail

Demonstration circuit 2924A-A/2924A-B features the LTM4681: the wide input and output voltage range, high efficiency and power density, quad output PolyPhase® DC/DC step-down μModule® regulator with digital power system management. Demo board DC2924A is available in two versions: DC2924A-A is configured as 4-phase 4 outputs, DC2924A-B is configured as 4-phase single output. The demo board default input voltage range is 4.5V to 16V. However, if VIN is lower than 6V and within 4.5V ≤ VIN ≤ 5.75V range, minor modification to certain existing onboard components is required. Please refer to the Operation at Low VIN: 4.5V ≤ VIN ≤ 5.75V paragraph in the demo manual for more details. The factory default output voltage (VOUT0, VOUT1, VOUT2 and VOUT3) is 1V at 30A maximum load current per channel (DC2924A-A). The factory default output voltage VOUT = 1V at 120A maximum load current (DC2924A-B). Each channel can deliver up to 30A maximum load current but forced airflow and heat sink might also be used to further optimize the output power when all output rails are on and fully loaded. The demo board output voltages can be adjusted from 0.6V up to 1.8V. Programming the output voltages to any value that is greater than 1.8V, requires derating output current based on thermal derating curves provided in the LTM4681 data sheet. The factory default switching frequency is preset at 350kHz typical. Both versions of DC2924A come 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, external power 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 LTM4681 data sheet and the 2924A-A/2924A-B demo manual prior to use or making any hardware changes to DC2924A-A/DC2924A-B.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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