Scalable regulator reduces capacitance for sub-28nm devices

Dual 25A or single 50A µModule (power module) regulators from Linear Technology are scalable, to deliver 300A to high power, low voltage sub-28nm GPUs, FPGAs, ASICs and microprocessors.

The LTM4650-1A guarantees ±0.8 per cent total DC voltage accuracy over reference, line, load and temperature (̶ 40to +125 degree C), whereas the LTM4650-1B guarantees ±1.5 per cent. Both devices can be optimised for ± three per cent or better total error band, including load step transients, with a minimum number of ceramic capacitors to meet the core voltage window requirement of sub-28nm digital ICs, says the company.

The company claims that the LTM4650-1A requires 60 per cent less capacitance than competing power PoL module regulators, because of three main features (12VIN, 1VOUT, 0A to 25A load step, 25A/micro sec).

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 per cent efficiency is recorded at 5VIN, 1.8VOUT and 86% at 12VIN, 1.0VOUT. It delivers the full 50A current up to 70 degree 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. The regulator is pin-compatible with the lower current LTM4630-1 (dual 18A or single 36A); no change in PCB layout is required.


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