Scalable µModule regulator needs less capacitance to power sub-28nm devices

9th September 2016
Caroline Hayes

Two regulators from Linear Technology, the LTM4650-1A and LTM4650-1B, dual 25A or single 50A µModule regulators are scalable to deliver 300A to sub-28nm GPUs, FPGAs, ASICs and microprocessors.

The low core voltage requires accurate voltage regulation at both steady state (DC) and fast load current transients. The LTM4650-1A guarantees ±0.8% total DC voltage accuracy over reference, line, load and temperature (̶ 40to 125°C); the LTM4650-1B guarantees ±1.5%. Both devices can be optimised for ±3% or better total error band, including load step transients with minimal ceramic capacitors to meet the core voltage window requirement of sub-28nm digital ICs, says the company.

According to the company, the LTM4650-1A requires 60% less capacitance compared to competing power PoL module regulators. This is due to guaranteed ±0.8% total DC voltage accuracy, which allows more margin (less capacitance) for the AC variation due to a load transient response to satisfy a given processor core voltage tolerance window.  

The device can be externally adjusted for optimum loop response to deliver load transients with fewer output capacitors. Finally, it operates with phase interleaving, which reduces input and output current ripple, reducing the requirement for load capacitance.

The LTM4650-1 includes a dual output DC/DC regulator, inductors and MOSFETs in a 16 x 16 x 5.01mm BGA package. It regulates an output voltage ranging from 0.6 to 1.8V from an input voltage within 4.5 to 15V. Delivering 50A, 92% efficiency is recorded at 5VIN, 1.8VOUT and 86% at 12VIN, 1.0VOUT. The device also delivers the full 50A current up to 70°C ambient, from 12VIN to 1.0VOUT with 200LFM airflow. It can be operated in parallel to increase output current, up to six in parallel for 300A of output current.

Operation is from -40 to 125ºC.


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