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Scalable µModule regulator needs 60% less capacitance

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

The low core voltage of these digital devices is said to require accurate voltage regulation at both steady state and fast load current transients. The LTM4650-1A guarantees ±0.8% total DC voltage accuracy over reference, line, load and temperatures ranging from -40 to 125°C, whereas the LTM4650-1B guarantees ±1.5%. Both devices can be optimised for ±3% or better total error band.

The LTM4650-1A requires 60% less capacitance because of three main features:

Guaranteed ±0.8% total DC voltage accuracy allows more margin for the AC variation due to a load transient response to satisfy a given processor core voltage tolerance.

It is adjustable for optimum loop response to deliver load transients with fewer output capacitors.

The device operates with phase interleaving, which reduces input and output current ripple, reducing the requirement for load capacitance.

The LTM4650-1 devices are available in a 16 x 16 x 5.01mm BGA package. They regulate an output voltage ranging from 0.6 to 1.8V from an input voltage from 4.5V to 15V. 92% efficiency is recorded at 5VIN, 1.8VOUT and 86% at 12VIN, 1.0VOUT.

The devices deliver full 50A current up to 70°C, from 12VIN to 1.0VOUT with 200LFM airflow. They can be operated in parallel to increase output current – up to six in parallel for 300A of output current.

Author
Peggy Lee