Step-down DC-DC converter in 1/16th brick footprint delivers 750 W

TDK Corporation announces the introduction of the 750 W rated TDK-Lambda i7A series of non-isolated buck DC-DC converters, packaged in the industry-standard 1/16th brick footprint. The output voltage of these 24 V nominal input step-down converters can be adjusted from 3.3 V to 18 V with a maximum current of 45 A. However, since the i7A is a step-down converter, the input voltage must always be at least 4 to 6 V higher than the desired output voltage.
The i7A models can be used to derive additional high-power outputs from a 24 Vdc power supply, at a lower cost and higher efficiency than isolated DC-DC converters. These very compact products are suited for use in robotics, drones, medical, industrial, test, measurement and portable battery-powered equipment.

Wide operating temperature range

Efficiencies of up to 98.5 percent dramatically minimise internal losses and allow the i7A to operate in ambient temperatures of -40 °C to +125 °C, even with low airflow conditions. The i7A’s design provides a low output ripple and excellent response to dynamic loads. Minimal external components are required, compared to discrete solutions, saving cost and printed circuit board space.

Three variants

A choice of three mechanical configurations is available, measuring just 34 mm wide and 36.8 mm in length. The 11.5 mm high open-frame model is suitable for applications requiring a low profile. The baseplate version can be conduction-cooled to a cold plate and is 12.7 mm high. Models with an integral heatsink, which are for convection or forced air cooling, are 24.9 mm high.

Trimmable output voltage

The i7A standard features include output voltage adjustment, + remote sense, remote on-off (positive or negative logic available), input under-voltage, over-current and over-temperature protection. Evaluation boards are available. All models have safety certification to the IEC/UL/CSA/EN 62368-1 standards, with CE marking to the Low Voltage and RoHS Directives. ds
Video DC-DC converters applications
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