Current-Sharing Dual LDOs


Design files


This power supply topology is capable of sourcing 6A via two LDOs operating in parallel. The solution sources current evenly between the two TPS74401’s, each capable of supplying 3A. This design allows for higher currents to be supplied than is typically possible with a single LDO. It also allows for additional heat syncing not available with an individual LDO.

  • Sources up to 6A
  • High PSRR to filter ripple
  • Low Noise output to provide a clean rail
  • Low dropout regulation
  • High Accuracy (1% over temperature)
  • Soft-start allows for monotonic startup
Output voltage options TIDA-00270.1
Vin (Min) (V) .9
Vin (Max) (V) 5.5
Vout (Nom) (V) 3.3
Iout (Max) (A) 6
Output Power (W) 19.8
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Linear Regulator

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.

TIDU421.PDF (1875 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

TIDRAB1.ZIP (2109 K)

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


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS744013-A, low-VIN (0.8-V), low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA3331.8-V, 17-µA, microPower, precision, zero-drift CMOS op amp

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
Design guide 6A Current-Sharing Dual LDO (TIDA-00270 Verified Design) Jun. 25, 2014

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