The device, LTM4650, is offered in a 16mm x 16mm x 5.01mm BGA with a patented built-in heat sink. The heat sink, attached to the MOSFETs and inductors, rapidly moves heat from the interior of the package to the top, where the surface of the heat sink is exposed to air, says the company.
Thermal dissipation is further improved with airflow, or a combination of airflow and attachment to an external heat sink. With no external heat sink, the LTM4650 delivers 50A from 12VIN to 0.9VOUT at up to 71°C ambient temperature with 200LFM airflow or up to 77°C with 400LFM.
The LTM4650’s precision current-mode architecture allows four devices to multiphase current share, delivering up to 200A to loads such as ASICs, FPGAs and microcontrollers. DC/DC conversion efficiency is improved by using Linear Technology’s DC/DC regulator IC with strong gate drivers and low loss MOSFETs. Delivering 50A, 92% efficiency is recorded at 5VIN, 1.8VOUT and 86% at 12VIN, 1.0VOUT.
With a differential remote sense amplifier to compensate for voltage drop due to circuit board trace impedance, the LTM4650 guarantees ±1.5% maximum total DC output voltage accuracy over line, load and temperature.
The LTM4650 is rated for operation from –40ºC to 125ºC. The 1,000-piece price starts at $46.75 each.