4.5 to 20Vin 1.8Vout @ 30A 15x20mm Synchronous Buck Converter Reference Design


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A single-phase synchronous buck converter accepting an input voltage of 4.5Vin to 20Vin and providing an output of 1.8Vout capable of supplying 30A of current. This design features an especially high power density (1.8Vout @ 30A in a 20mm x 15mm board) with single-sided component mounting.

  • Tiny converter footprint of 20 mm x 15 mm (0.8" x 0.6")
  • Wide input voltage operating range of 3 V to 20 V, 30A output current
  • 600-kHz switching frequency, synchronizable to an external clock signal up to 1.2 MHz
  • High conversion efficiency: 91% at 1.8 V, 30 A
  • Inductor DCR current sensing with remote BJT thermal compensation


(Output Voltage 1)
Vin (Min) (V)4.5
Vin (Max) (V)20
Vout (Nom) (V)1.8
Iout (Max) (A)30
Output Power (W)54
Input TypeDC
TopologyBuck- Synchronous

TI Devices (1)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM27403  3-20V, Voltage Mode Synchronous Buck Controller with Temperature-Compensated DCR Current Sensing  Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents
User guides (2)
Title Abstract Type Size (KB) Date Views
PDF 2433 16 Oct 2013 836
PDF 520 19 Sep 2013 9
Design files (2)
Title Abstract Type Size (KB) Date Views
PDF 102 19 Sep 2013 77
PDF 107 19 Sep 2013 49
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Software (1)

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