The LTM4630 is a dual 18A per output or single 36A output DC/DC µModule step-down regulator capable of delivering up to 144A when four devices are current shared. It is a complete DC/DC regulator system in a 16mm x 16mm x 4.41mm LGA package, which includes inductors, MOSFETs, DC/DC controller and compensation circuitry. High efficiency and low thermal package impedance are achieved with expert analog and packaging design. The efficiency for 36A at 1VOUT, from 12VIN is 86% and from 5VIN, is 88%. With no need for an external heat sink, the LTM4630 delivers 36A up to 60°C ambient with no airflow, 65°C with 200LFM and 69°C with 400LFM. An external heat sink increases the maximum operating ambient temperature by approximately 10°C. Excellent heat dissipation, scalable and high output power capability, small footprint and low profile package of the LTM4630 enable system designers to lay out more densely populated boards. Typical of applications include mezzanine boards such as ATCA, µTCA, point-of-load regulation for new processors, ASICs, and the recently introduced <28nm FPGAs as well as high-speed SERDES.Without requiring board layout changes, system designers can interchange four pin-compatible µModule regulators to obtain different power levels: LTM4628 (dual 8A), LTM4620 and LTM4620A (dual 13A) and the LTM4630 (dual 18A). The LTM4630 is designed to convert 12VIN to high power (up to 144A) point-of-load voltages down to 0.6V. The input voltage range is 4.5V to 15V (16V max) with output ranging from 0.6V to 1.8V. An internal remote sense amplifier guarantees +/-1.5% accurate output regulation over temperature, line and load, by sensing the voltage at the load and thus compensating for voltage droop caused by circuit board trace impedance. The LTM4630 is rated for operation from -40°C to 125°C. 1,000-piece pricing starts at $35.05 each.
