Isolated Ultra-Low Power Design for 4 to 20 mA Loop Powered Transmitters


Design files


The objective of this design is to provide a turn-key solution able to power the electronics of isolated loop powered 4 to 20 mA transmitters or other low power applications with limited input current budget. It addresses the key requirements of such applications like operating over wide input voltage range, providing isolated and no-isolated noise-free outputs and offering a complete set of protection features. Multiple test points on the board, a dual layer - single side populated construction and a comprehensive documentation enable easy testing, modification and optimization by the user.

Watch the TIDA-00349 Overview video, covering the same isolated power topology as used in the TIDA-00167 NOW

  • Operates over a wide input voltage range from 8 to 33
  • Provides isolated and non-isolated 3.3V rails, selectable between low Iq LDOs and high PSRR LDOs
  • Highly efficient isolated DC/DC converter with constant switching frequency achieves more than 70% efficiency at 5 to 8 mW load
  • Contains input surge protection (EN 61000-4-5: ±1 kV), reverse protection, current limiters for hot-plug and surge and protects a transmitters loop current sense circuit
  • On-board ripple filter to address conducted EMI requirements (EN 55011) and decoupling from loop current
  • Fully functional board which can easily be tested, modified and optimized
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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.

TIDU414.PDF (11528 K)

Reference design overview and verified performance test data

TIDRAR8.PDF (3288 K)

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


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

TIDC651.ZIP (278 K)

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

TIDRAS1.PDF (1881 K)

PCB layer plot file used for generating PCB design layout

TIDRAS2.PDF (6007 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Load switches

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Technical documentation

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Type Title Date
* Design guide Isolated Ultra-Low Power Design for 4- to 20-mA Loop-Powered Transmitters Jun. 20, 2014
White paper Powering sensors with LDOs for industrial process control white paper Feb. 12, 2015

Related design resources

Reference designs

TIDA-00189 Isolated Loop Powered Thermocouple Transmitter Reference Design TIDA-00245 Data Isolation for Loop Powered Applications Reference Design TIDA-00246 Generic Energy Harvesting Adapter Module for Thermoelectric Generators (TEG) Reference Design TIDA-00349 Uniquely Efficient Isolated DC/DC Converter for Ultra-Low Power and Low Power Apps Reference Design TIDA-00459 Highly Efficient Power & Data Transmission for Isolated Low Power Applications Reference Design

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