12V Input 3W Dual 5V Output Synchronous Buck Converter


Design files


This supply uses the TPS562209 buck converter to generate a 5V/0.5A regulated output and an auxilliary 5V/0.2A unregulated output.  A two winding coupled inductor is used to generate the auxilliary output.   The auxilliary output is left floating, and could be used as a -5V output or as a second +5V output.  This simple design results in an efficient, yet low cost solution for a dual output system.  The peak efficiency is over 92%.

  • Generate two outputs with a single device and a single power stage.
  • The TPS562209 comes in a tiny SOT23 package.
  • DCAP2 control reduces output capacitance and eliminates extra compensation components.
  • Auxilliary output is left floating and can be referenced to any node, or used as a negative output, if required.
  • Good efficiency, over 92%.
Output voltage options PMP10379.1
Vin (Min) (V) 10
Vin (Max) (V) 14
Vout (Nom) (V) 5
Iout (Max) (A) .5
Output Power (W) 2.5
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Integrated Switch^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.

TIDU561.PDF (1827 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


Detailed overview of design layout for component placement

TIDC648.ZIP (170 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS56220917 V Input, 2A Synchronous Step-Down Regulator in SOT-23

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP10379 Test Results Sep. 26, 2014

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