Getting Power from Earphone Jack Reference Design


Design files


This design is for powering a small system attached to a smartphone audio jack.  The reference design includes a charge pump and a boost converter. The charge pump is used to filter AC input into a DC voltage and the ultra-low quiescent current boost converter TPS610981 is used to generate a stable 3.3V.


  • Low input voltage range
  • High efficiency boost converter
  • Small solution size

Output voltage options PMP9777.1
Vin (Min) (V) .4
Vin (Max) (V) 2.2
Vout (Nom) (V) 3.3
Iout (Max) (A) .001
Output Power (W) .0033
Isolated/Non-Isolated Non-Isolated
Input Type AC
Topology Boost- Synchronous

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.

TIDUB35.PDF (909 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

TIDRJC3.ZIP (6146 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)

TPS610981Low input voltage, 3.3-V output voltage, synchronous boost converter with integrated LDO

Data sheet document-pdfAcrobat PDF open-in-new HTML

LMV7271Single low voltage, push-pull comparator

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD17483F430-V, N channel NexFET™ power MOSFET, single LGA 1 mm x 0.6 mm, 260 mOhm, gate ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
Test report Getting Power from Earphone Jack Design Guide Nov. 18, 2015

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