1/16th brick footprint DC-DC buck converter series enhances performance

TDK Corporation has expanded the TDK-Lambda i7A series of non-isolated buck (step-down) DC-DC converters with the industry-standard 1/16th brick pinout. 20A output models with a 500W maximum rating are now offered, providing a trimmable 3.3-32V output capability and operation from 28V up to 60V input. An adjustable over-current limit is also provided as an option, relieving stress on the converter or load when exposed to excessive overcurrent conditions and enabling fine-tuning based on actual system requirements.

The 20A i7A models can derive extra high-power outputs at a lower cost and higher efficiency than isolated DC-DC converters. These compact products are ideal for mobile robotics, drones, medical, industrial, test and measurement, communications, computing, and portable battery-powered equipment.

Efficiencies of up to 96% dramatically minimise internal losses and enable the models to function in ambient temperatures of -40C up to +125C, even with low airflow conditions. The model's design provides low output ripple and outstanding response to dynamic loads. Compared to discrete solutions, minimal external components are needed, saving cost and printed circuit board space.

Like the i7A 33A, 45A, and 60A versions, the 20A provides a choice of three mechanical configurations. It measures just 34mm wide and 36.8mm in length. The 11.5mm high open-frame model is ideal for applications needing a low profile and weighs just 25g. The baseplate version can be conduction-cooled to a cold plate and is 12.7mm high. Models with an integral heatsink for convection or forced air cooling are 24.9mm high.

The device's standard features include output voltage adjustment, positive remote sense, negative logic remote on-off, input under-voltage, over-current and over-temperature protection. Evaluation boards are available for simplified qualification.

All models are safety certified to the IEC/UL/CSA/EN 62368-1 standards, and they have CE and UKCA markings to the Low Voltage and RoHS Directives.