Low-Noise Fixed Drop-Out ±2.5 to ±12-VOUT 3A Power Supply Reference Design for Ultrasound CW Pulser


Design files


This reference design allows a digitally programmable power supply to power an ultrasound transmit circuit for continuous wave (CW) mode from a 24-V bus. There are two outputs adjustable from ±2.5 to ±12 V under user software control. These outputs can provide up to 2 A with very low ripple and noise on both positive and negative regulator outputs. The power supply is scalable for higher output currents up to 3 A by adding more regulators in parallel. The power supplies can also be synchronized to an external clock.

  • Separate and independent positive and negative voltage power supplies for CW mode in ultrasonic
  • To reduce ripple at output's high performance, low noise LDOs are operated as power filters to obtain lowest ripple with minimum heat dissipation in LDO (<100µV at 1.6A load)
  • Comprises two high-performance buck regulators for creating adjustable outputs
  • Adaptive drop on LDO, special circuit keeps LDO output always 1V below LDO input
  • Capable of switching frequency synchronization with ultrasound master or system clock frequency
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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.

TIDUD98.PDF (2192 K)

Reference design overview and verified performance test data


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

TIDRSZ9.ZIP (3206 K)

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

TIDCDW5.ZIP (1681 K)

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

TIDRSZ8.PDF (1425 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Linear & low-dropout (LDO) regulators

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Shunt voltage references

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Technical documentation

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Type Title Date
* Design guide Low-Noise, Fixed Drop-Out, ±2.5- to ±12-VOUT, 3-A Power Supply Reference Design Sep. 29, 2017
Application note Create an Inverting Power Supply Using a Synchronous Step-Down Regulator (Rev. B) Jun. 25, 2018
Technical article Take your ultrasound design to the next level PDF | HTML Feb. 08, 2018

Related design resources

Reference designs

TIDA-01352 400-W Continuous, Scalable, ±2.5- to ±150-V, Programmable Ultrasound Power Supply Reference Design TIDA-01466 Low-Voltage, Low-Noise Power-Supply Reference Design for Ultrasound Front End

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