Regulator is scalable and integrates MOSFET, DC/DC controller

Integrating an inductor, MOSFET, DC/DC controller and supporting components in a BGA package measuring 9.0 x 15 x 5.01mm, the LTM4647 is a 30A step-down µModule (power module) regulator from Linear Technology.

Conversion efficiency from 12VIN to 1VOUT at 30A is 87 per cent, when delivering a full 30A continuously without a heat sink or air flow at 70 degree C ambient. The LTM4647 can deliver up to 180A by current sharing six devices in parallel.

Total output voltage DC accuracy is guaranteed at ±1.2 per cent over reference, feedback resistor, line, load and temperature (–40 to +12 degree C). The on-board remote sense amplifier compensates for the voltage drop caused by trace impedance of the PC board due to large load currents, adds the company. The regulator’s size allows it to PCB area constraints of densely populated system boards and power low voltage and high current devices such as FPGAs, ASICs, microprocessors and GPUs. Applications include PCIe boards, communications infrastructure, cloud computing-based systems, test and measurement, medical and industrial equipment.

Input voltage ranges from 4.7 to 15V, and output voltage can be set by an external single resistor ranging from 0.6 to 1.8V. Output voltage tracking and soft-start features can be used to set sequencing with other system rails. The switching frequency can be set by an external single resistor ranging from 400 to 700kHz or can be synchronised to an external clock. Fault protection features include over-voltage protection, over-current protection, and temperature monitoring.


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