LTM4681 – Quad 31.25A or Single 125A μModule Regulator with Digital Power System Management

Analog Devices Inc. LTM4681 μModule® DC/DC Regulator features 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 regulator’s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. It features readable true input current sense, output currents and voltages, output power, temperatures, uptime, and peak values. 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. The LTpowerPlay® GUI and DC1613 USB-to-PMBus converter and demo kits are available. The LTM4681 is housed in a 15mm × 22mm × 8.17mm BGA package available with SnPb or RoHS compliant terminal finish.

Block Diagram


  • 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


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