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Designing 15W High Density 12Vin to 3.3Vout - 4A DC-DC solution in smallest PCB footprint

This project provides a detail practical design for a high current density 12Vin to 3.3Vout DC-DC design using TDK micro-POL Chip Embedded Power Modules. Total design with FS1404-3300-AS (3.3V module) with output caps in 7mm x 7mm delivering 13W+.

Parts list

Qty Product Part number
1 FS1406-0600-AS 210-8772
1 FS1404-3300-AS 210-8770
1 FS1403-5000-AS 210-8767
1 Evaluation Board for use with FS1404 210-8764
1 Evaluation Board for use with FS1403 210-8763
1 Evaluation Board for use with FS1406 210-8765

System voltage supplies are very common for 3.3V, 5.0V from a 12Vinput bus rail, this project provides a practical design using TDK micro-POL chip embedded power modules in the small PCB footprint. 

The complete design is shown with data for customer evaluation, with evaluation boards available from RS Components. 

The design shows FS1404-3300-AS (4A) for 12Vin to 3.3Vout. Other devices:  FS1406 (6A) and FS1403 (3A) Note:  I2C is optional.  The device can operate in analog DC-DC mode.  For additional designs see see Power Users Guides.

The design shown delivers a 13W 3.3Vout solution (12Vin) using a 3.3mm x 3.3mm x 1.5mm height power module with an integrated thin-film inductor.  Only 2 x 22uF capacitors needed for a low BoM component count.   90% efficiency in the total design space of 7mm x 7mm.   

With only 2 x 22uF load caps, the FS1404 delivered +/-20mV pp (+/- 0.6%) transients from 0A to 4A step load. 

The design also showed excellent thermal performance without airflow as the module is rated from -40C to +125C with excellent thermal deratings. 

Tony Ochoa Faradaysemi, A TDK Group Company Tony Ochoa is the director of marketing at TDK, supporting mixed signal analog in both precision and power. He has over 30 years of industry experience, and has worked for Analog Devices, National Semiconductor, Infineon, and several other start-up in the Silicon Valley area. He holds a BSEE from the University of California and MBA. When not working on engineering, you will find him in the waves in Oceanside, California.

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