0.8V-4.2Vin to 3.3V@100mA Boost+Buck Reference Design
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Key Document


The PMP21055 reference design converts a 0.8V to 4.2V input to a 3.3V/100mA output in a small form factor measuring 12mmx8mm. The design is built on a 2 layer, 1oz board and is a low-cost, small size design intended for battery powered applications. 

  • 0.8V-4.2Vdc input to 3.3V/100mA output
  • >85% efficiency at 3Vin, 100mA load
  • Boost+buck design for low Vin operation
  • Complete test report and design support collateral, including thermal performance
  • 1oz, 2-layer board, 12mm x 8mm solution size

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
Vin (Min) (V).8
Vin (Max) (V)4.2
Vout (Nom) (V)3.3
Iout (Max) (A).1
Output Power (W).33
Input TypeDC
TopologyBoost- Synchronous
Buck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS61021A  3-A Boost Converter with 0.5-V Ultra Low Input Voltage  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS62743  2V-5.5V input, ultra-low-power 300mA to 400mA step-down buck DCDC converter with 360nA Iq  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TPS61021A Download
TPS62743 Download -

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 481 02 Nov 2017
Design files (6)
Title Type Size (KB) Date
ZIP 368 02 Nov 2017
ZIP 3746 02 Nov 2017
PDF 247 02 Nov 2017
PDF 47 02 Nov 2017
PDF 54 02 Nov 2017
PDF 77 02 Nov 2017

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