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Independent rail dual buck converter with TPS51220

Posted: 24 Feb 2014     Print Version  Bookmark and Share

Keywords:TPS51220  buck regulator  LDOs  power supply 

The TPS51220 device is a dual-synchronous buck regulator controller with two LDOs. It is optimised for a 5-V or 3.3-V system controller, enabling designers to cost effectively complete a power supply for a 2-cell to 4-cell notebook system. The TPS51220 is touted to support high-efficiency, fast-transient response and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 to 28 V, and output voltages from 1 to 12 V.

This application report shows the design and test of a simple circuit to achieve rail independence in TPS51220, which otherwise cannot be used in independent supplies. The same arrangement can be extended to any supply to ensure supply-rail stability before the device is enabled.

View the PDF document for more information.

Originally published by Texas Instruments at as "Independent Rail Dual Buck Converter Using TPS51220".

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