15W Automotive Start Stop Power Supply
TI’s PMP9476 is a non-synchronous buck converter plus a non-sync boost controller accepting an input voltage of 3.5V to 40V, with 5V output at up to 3A of current to the load. It features a small form factor; with PFET to replace LM3481 controller rectifier to improve efficiency and low component temperature rise; and reverse polarity protection built in.
The nominal switching frequency of the design is 300kHz. The board is a 4- layer PCB with 1oz copper on all 4 layers. The design incorporates an LM3481 boost controller acts as a pre-boost stage for the LM26003 buck when start-stop occurs.
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