4-mA to 20-mA Loop Energy Harvester Reference Design
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Key Document


The TIDA-00649 reference design demonstrates energy harvesting from 4-mA to 20-mA loop-powered systems. The design is simple to insert into existing installations where it scavenges energy from the loop and generates a regulated output voltage. Furthermore, the circuit provides an analog output representing the actual loop current value. The insertion loss can be as low as 400 mV and can also be increased up to 2.85 V to address higher output power levels. All these features provide an easy way for powering wireless adapters (WirelessHART® , Bluetooth® low energy (BLE), and so forth), indicators, displays, Human Machine Interfaces (HMIs), and others for a seamless upgrade of existing 4-mA to 20-mA loop-powered systems.

  • Minimal insertion loss
    • - 0.4 V to 2.85 V, selectable
    • - Adaptable to voltage margin
    •    in loop and required output power
  • Adjustable output voltage between 1.8V to 3.8V
  • 15mA peak-pulsed output current
  • Loop current sensing
    • Analog output 100 mV/mA
    • Active 10-kHz low-pass filter
  • Reverse polarity protection
  • Designed to withstand surges according to IEC 61000-4-5; ±1 kV; 40 Ω
  • Flexible configuration for test and evaluation

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Design Files

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(Output Voltage 1)
Vin (Min) (V).4
Vin (Max) (V)2.85
Vout (Nom) (V)3.3
Iout (Max) (A).015
Output Power (W).0495
Input TypeDC

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
BQ25570  Ultra Low power Harvester power Management IC with boost charger, and Nanopower Buck Converter  Battery management ICs  Sample & Buy View Design Kits & Evaluation Modules
CSD17313Q2  30-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 32 mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
TLV341A  Single low-voltage, improved offset, rail-to-rail output CMOS op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TS5A3160  1-Ω on-state resistance, 5-V, 2:1 (SPDT), analog switch (6-pin SOT-23, SC70 packages)  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
BQ25570 Download Download
CSD17313Q2 WSON (DQK)| 6 Download -
TLV341A Download Download
Download Download
TS5A3160 Download Download
Download Download
Download -

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Technical documentation

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Application note (2)
Title Type Size (KB) Date
PDF 1957 24 Oct 2016
PDF 647 26 Apr 2016
User guide (1)
Title Type Size (KB) Date
PDF 1562 07 Feb 2017
White paper (1)
Title Type Size (KB) Date
Multiple Files   10 Apr 2019
Design files (6)
Title Type Size (KB) Date
ZIP 530 09 Dec 2016
ZIP 840 09 Dec 2016
PDF 1682 09 Dec 2016
PDF 319 09 Dec 2016
PDF 142 09 Dec 2016
PDF 568 09 Dec 2016
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Reference Designs (5)

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