Low-Voltage, Low-Noise Power-Supply Reference Design for Ultrasound Front End

(ACTIVE) TIDA-01466

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Key Document

Description

This reference design is a power supply optimized specifically for providing power to eight 16-channel receive AFE ICs for ultrasound imaging systems. This design reduces part count while maximizing efficiency by using single-chip DC-DC converter + LDO combo regulators to set the LDO input just above the dropout voltage while taking full advantage of the LDO PSRR.  In addition, ultra-low-noise LDOs help to attain the highest resolution possible from A/D conversion, leading to higher image quality. This design is capable of switching frequency synchronization with the master and system clock frequency to aid system designers apply simple filtering techniques to remove power supply switching noise on ground loops or use spreadspectrum clocking to reduce EMI. Additionally, the design implements an eFuse device, providing a simple and flexible means of overcurrent protection.

Features
  • Suitable for 12V input ultrasound system front end
  • eFuse operating with input current limit of 4.2A
  • Capable of powering eight AFEs for up to 128 channels (scalable channel count), supports power output of 36W
  • Combo DC/DC converter + LDO ICs maximizes LDO efficiency by setting LDO input just above dropout voltage
  • Uses high PSRR and ultra-low-noise (4.4 μVRMS) LDOs to attain highest resolution possible from A/D conversion
  • Common synchronized power supply for all AFEs on same T/R board reduces board space while aiding noise reduction and EMI elimination

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Design Files

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Bill of Materials (BOM)

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CDCLVC1106  Low Jitter, 1:6 LVCMOS Fan-out Clock Buffer  Clock buffers  Sample & Buy View Design Kits & Evaluation Modules
LM3881  3 Rail Simple Power Sequencer with Adjustable Time Delay  Power management  Sample & Buy View Design Kits & Evaluation Modules
TLV704  24V Input Voltage, 150mA, Ultra-Low-Iq Low-Dropout (LDO) Regulators  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS25926  12V, 5A, 30mΩ eFuse with Adjustable +/-15% Accurate Current Limit  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS54122-Q1  Automotive-grade 3A QuietSupply™ Regulator with Integrated DC-DC Converter and Low-Noise LDO  Step-down (buck)  Not Available View Design Kits & Evaluation Modules
TPS54824  4.5V to 17V Input, Current Mode, 8A Synchronous SWIFT™ Step-Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A8300  2A, Low-Dropout Voltage Regulator for High-Speed Communication Systems  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A84  High-Current (3A), High-Accuracy (1%), Low-Noise (4.4μVRMS), LDO Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CDCLVC1106 Download Download
LM3881 Download Download
TLV704 Download Download
TPS25926 Download
TPS54122-Q1 Download -
TPS54824 Download Download
TPS7A8300 Download
Download -
TPS7A84 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1293 20 Sep 2017 40
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1848 20 Sep 2017 12
ZIP 1173 20 Sep 2017 13
PDF 1795 20 Sep 2017 7
PDF 371 20 Sep 2017 11
PDF 172 20 Sep 2017 7
PDF 1003 20 Sep 2017 21

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