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


Design files


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
Output voltage options PMP21055.1
Vin (Min) (V) .8
Vin (Max) (V) 4.2
Vout (Nom) (V) 3.3
Iout (Max) (A) .1
Output Power (W) .33
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Boost- Synchronous^Buck- Synchronous
?? View video with transcript Video

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.


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

TIDRT97.PDF (77 K)

Detailed schematic diagram for design layout and components

TIDRT98.PDF (54 K)

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

TIDRT99.PDF (47 K)

Detailed overview of design layout for component placement

TIDRTA1.ZIP (3746 K)

Files used for 3D models or 2D drawings of IC components


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost converters (integrated switch)

TPS61021A3-A Boost Converter with 0.5-V Ultra Low Input Voltage

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS627432V-5.5V input, ultra-low-power 300mA to 400mA step-down buck DCDC converter with 360nA Iq

Data sheet: PDF | HTML

Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Test report PMP21055 Test Results Nov. 02, 2017

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​