In a 16 x 16 x 5.01 mm BGA it has a built-in heat sink, attached to the MOSFETs and inductors, that rapidly moves heat from the interior of the package to the top, where the surface of the heat sink is exposed to air. 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 12 VIN to 0.9 VOUT at up to 71°C ambient temperature with 200 LFM airflow or up to 77°C with 400 LFM.
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 5 VIN, 1.8 VOUT and 86% at 12 VIN, 1.0 VOUT.
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. It is rated for operation from –40ºC to 125ºC and pricing starts from $46.75 (1000).
Linear Technology; www.linear.com/product/LTM4650
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