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


Design files


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
Output voltage options TIDA-00649.1
Vin (Min) (V) .4
Vin (Max) (V) 2.85
Vout (Nom) (V) 3.3
Iout (Max) (A) .015
Output Power (W) .0495
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Boost^Buck
??image.gallery.download_en_US?? 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.


Reference design overview and verified performance test data

TIDRP20.PDF (568 K)

Detailed schematic diagram for design layout and components

TIDRP21.PDF (142 K)

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

TIDRP22.PDF (319 K)

Detailed overview of design layout for component placement

TIDRP24.ZIP (840 K)

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


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

TIDRP23.PDF (1682 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog switches & muxes

TS5A31601-Ω on-state resistance, 5-V, 2:1 (SPDT), analog switch (6-pin SOT-23, SC70 packages)

Data sheet: PDF | HTML
Battery charger ICs

BQ25570Ultra Low power Harvester power Management IC with boost charger, and Nanopower Buck Converter

Data sheet: PDF | HTML
General-purpose op amps

TLV341ASingle, 5.5-V, 2.2-MHz, 1.25-mV offset operational amplifier with shutdown

Data sheet: PDF | HTML

CSD17313Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 32 mOhm

Data sheet: PDF | HTML

Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 4
Type Title Date
* Design guide 4-mA to 20-mA Loop Energy Harvester Reference Design (Rev. A) Feb. 07, 2017
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Analog Design Journal Low-EMI buck powers a multivariable sensor transmitter with BLE connectivity Oct. 24, 2016
Analog Design Journal Low-IQ synchronous buck converter enables intelligent field-sensor applications Apr. 26, 2016

Related design resources

Reference designs

TIDA-00242 Solar Power Energy Harvester Reference Design Using a Super Cap TIDA-00246 Generic Energy Harvesting Adapter Module for Thermoelectric Generators (TEG) Reference Design TIDA-00588 Energy Harvester Booster Pack Reference Design TIDA-00616 Energy Harvesting LaunchPad BoosterPack for Brushed DC Motor Control Reference Design TIDM-WLMOTORMONITOR Wireless Motor Monitor Reference Design

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. ​​​​​​​​