IC manufacturers Texas Instruments

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Texas Instruments TPS54122

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

Overview

TopologyBuck Converter
Input voltage5.6 V
Switching frequency300-2000 kHz
Output 11.8 V
IC revisionE1

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

Typical applications

  • Mother and Neonatal Care Monitors / Seeker Front End / Ultrasound Scanners / X-Ray Systems

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,30%
(A)
RDC typ.
(mΩ)
fres
(MHz)
MountISAT,10%
(A)
Z @ 100 MHz
(Ω)
Zmax
(Ω)
Test Condition ZmaxIR 2
(mA)
RDC max.
(mΩ)
Type Samples
74437346056SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

8 files Active i| Production is active. Expected lifetime: >10 years.WE-LHMI SMT Power Inductor 5.6 5 12.1 43 20 SMT 5.9 48
74439346056SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-XHMI SMT Power Inductor 5.6 8.9 12.1 15 25 SMT 5.8 16.5
742792625SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-CBF SMT EMI Suppression Ferrite Bead SMT 120 180 400 MHz 2000 50 High Current
Order Code Data­sheet Simu­lation
74437346056SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

74439346056SPEC
742792625SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,30%
(A)
RDC typ.
(mΩ)
fres
(MHz)
MountISAT,10%
(A)
Z @ 100 MHz
(Ω)
Zmax
(Ω)
Test Condition ZmaxIR 2
(mA)
RDC max.
(mΩ)
Type Samples