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

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
Vin (Min) (V)10
Vin (Max) (V)14
Vout (Nom) (V)5
Iout (Max) (A).5
Output Power (W)2.5
Input TypeDC
TopologyBuck- Integrated Switch
Buck- Synchronous

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS562209  17 V Input, 2A Synchronous Step-Down Regulator in SOT-23  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TPS562209 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1764 26 Sep 2014
Design files (4)
Title Type Size (KB) Date
ZIP 170 26 Sep 2014
PDF 52 26 Sep 2014
PDF 80 26 Sep 2014
PDF 113 26 Sep 2014

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