Single 36-A or dual 18-A regulator is 86 percent efficient from 12-VIN to 1-VOUT at full load

Single 36-A or dual 18-A regulator is 86 percent efficient from 12-VIN to 1-VOUT at full load

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By eeNews Europe

The LTM4630 is a complete DC/DC regulator system in a 16 mm x 16 mm x 4.41 mm 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 36 A at 1VOUT, from 12VIN is 86% and from 5 VIN, is 88%. With no need for an external heat sink, the LTM4630 delivers 36 A up to 60°C ambient with no airflow, 65°C with 200 LFM and 69°C with 400 LFM. 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 <28 nm FPGAs as well as high-speed SERDES.

Without requiring a printed circuit board layout changes, system designers can interchange four pin-compatible µModule regulators to obtain different power levels: LTM4628 dual (8 A), LTM4620 and LTM4620A (dual 13 A) and the LTM4630 (dual 18 A). Each product’s output operates 180º out-of-phase to minimize both output ripple (when outputs share current) and input ripple, resulting in fewer and smaller capacitors.

The LTM4630 is designed to convert 12 VIN to high power (up to 144 A) point-of-load voltages down to 0.6 V. The input voltage range is 4.5 V to 15 V (16 V max) with output ranging from 0.6 V to 1.8 V. 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 printed circuit board trace impedance.

The LTM4630 features fast short-circuit protection where a current foldback technique reduces IOUT to a minimum, preventing the µModule regulator from overheating and protecting the load as well as upstream power supply. Once the short-circuit condition is removed, the LTM4630 resumes operation. The LTM4630 is rated for operation from -40°C to 125°C. 1,000-piece pricing starts at $35.05 each.

More information about the LTM4630 step-down regulator at

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