Dual Buck with 5V @ 7A and 3.3V @ 4A Reference Design


Design files


This design is a dual buck for 12V input voltage which provides 5.0V @ 7.0A and 3.3V @ 4.0A. TIs CSD86330Q3D Power Blocks enable a high efficiency even at high switching frequencies.

Output voltage options PMP8703.1 PMP8703.2
Vin (Min) (V) 12 18
Vin (Max) (V) 12 35
Vout (Nom) (V) 5 3.3
Iout (Max) (A) 7 4
Output Power (W) 35 13.2
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck- Synchronous Buck- Synchronous
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLUUB07.PDF (805 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

TPS40322Dual Output or Two-phase Synchronous Buck Controller

Data sheet: PDF | HTML

CSD86330Q3D25-V, N channel synchronous buck NexFET™ power MOSFET, SON 3 mm x 3 mm power block, 20 A

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP8703 Test Results Apr. 03, 2014

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