Getting Power from Earphone Jack Reference Design
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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

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Schematic/Block Diagram

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Test Data

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Design Files

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(Output Voltage 1)
Vin (Min) (V).4
Vin (Max) (V)2.2
Vout (Nom) (V)3.3
Iout (Max) (A).001
Output Power (W).0033
Input TypeAC
TopologyBoost- Synchronous

TI Devices (3)

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
CSD17483F4  30V, N ch NexFET MOSFET™, single LGA 1.0 x 0.6mm, 260mOhm  MOSFETs  Sample & Buy Not Available
LMV7271  Single low voltage, push-pull comparator  Amplifiers  Sample & Buy Not Available
TPS610981  Low input voltage, 3.3V output voltage, synchronous boost converter with integrated LDO/load switch  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMV7271 Download Download
Download Download
TPS610981 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 874 18 Nov 2015
Design files (6)
Title Type Size (KB) Date
ZIP 464 10 Dec 2015
ZIP 6146 10 Dec 2015
PDF 233 10 Dec 2015
PDF 60 10 Dec 2015
PDF 245 10 Dec 2015
PDF 65 10 Dec 2015

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