New Industry Products

Dual 25A Outputs in Non-Isolated Digitally-Programmable Regulators

July 10, 2019 by Scott McMahan

Analog Devices introduced the LTM®4664, a complete non-isolated 48V input high efficiency, step-down µModule® regulator with dual 25A outputs. The regulator integrates the power MOSFETS, switching controllers, inductors and supporting components. Only external capacitors are needed to complete the design.

Applications for the regulator module include 48V systems, computer and networking equipment, electronic test equipment, and energy storage systems. (See typical application circuit diagram above).

Operating over a 30V to 58V input voltage range, the LTM4664 supports an output voltage of 0.5V to 1.5V at up to 75W. An intermediate output at 25% Vin is also available. At 50A for 48V to 1V the regulator delivers 88% efficiency.

Graph of Efficiency vrs. Current for LTM4664

The LTM4664 dual 25A regulators employ digitally programmable analog control loops, precision data acquisition circuitry, and EEPROM with ECC. Its 2-wire serial interface allows the 25A outputs to be margined, tuned, and ramped up and down at programmable slew rates and sequencing delay times.

True input current sense, output currents, and voltages, input and output power, temperatures, uptime, and peak values are all readable. It features dual analog loops. Compensation, control, and monitoring is accomplished via a 400kHz PMBus-compliant I2C serial interface. The regulator is in a 16mm × 16mm × 7.72mm BGA package, and it can scale up to 300A.

The device has ±3% output current readback accuracy at operating temperatures of -20° to 125°C and a ±0.5% output voltage accuracy over the temperature range.


  • Can Scale to 300A
  • Dual Analog Loops with Digital Interface for
  • Compensation, Control and Monitoring
  • Input Voltage Range: 30V to 58V
  • Output Voltage Range: 0.5V to 1.5V
  • ±3% Output Current Readback Accuracy (-20° to 125°C)
  • 88% Efficiency for 48V to 1V at 50A
  • ±0.5% Output Voltage Accuracy Over Temperature
  • 400kHz PMBus-Compliant I2C Serial Interface
  • 16mm × 16mm × 7.72mm BGA Package