LT3071 - 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining


  • Output Current: 5A
  • Dropout Voltage: 85mV Typical
  • Digitally Programmable VOUT : 0.8V to 1.8V
  • Analog Output Margining: ±10% Range
  • Low Output Noise: 25μVRMS (10Hz to 100kHz)
  • Parallel Multiple Devices for 10A or More
  • Precision Current Limit: ±20%
  • Output Current Monitor: IMON = IOUT/2500
  • ±1% Accuracy Over Line, Load and Temperature
  • Stable with Low ESR Ceramic Output Capacitors (15μF Minimum)
  • High Frequency PSRR: 30dB at 1MHz
  • Enable Function Turns Output On/Off
  • VIOC Pin Controls Buck Converter to Maintain Low Power Dissipation and Optimize Efficiency
  • PWRGD/UVLO/Thermal Shutdown Flag
  • Current Limit with Foldback Protection
  • Thermal Shutdown
  • 28-Lead (4mm × 5mm × 0.75mm) QFN Package

Typical Application

LT3071 Typical Application
LT3071 Typical Application


The LT3071 is a low voltage, UltraFast™ transient response linear regulator. The device supplies up to 5A of output current with a typical dropout voltage of 85mV. A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS. The LT3071’s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost. The LT3071’s features make it ideal for high performance FPGAs, microprocessors or sensitive communication supply applications.

Output voltage is digitally selectable in 50mV increments over a 0.8V to 1.8V range. An analog margining function allows the user to adjust system output voltage over a continuous ±10% range. The IC incorporates a unique tracking function to control a buck regulator powering the LT3071’s input. This tracking function drives the buck regulator to maintain the LT3071’s input voltage to VOUT + 300mV, minimizing power dissipation.

Internal protection includes UVLO, reverse-current protection, precision current limiting with power foldback and thermal shutdown. The LT3071 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT3071EUFD#PBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT3071EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT3071IUFD#PBF 4x5 QFN-28 UFD I 05-08-1712 Yes
LT3071IUFD#TRPBF 4x5 QFN-28 UFD I 05-08-1712 Yes
LT3071MPUFD 4x5 QFN-28 UFD MP 05-08-1712 No
LT3071MPUFD#PBF 4x5 QFN-28 UFD MP 05-08-1712 Yes
LT3071MPUFD#TR 4x5 QFN-28 UFD MP 05-08-1712 No
LT3071MPUFD#TRPBF 4x5 QFN-28 UFD MP 05-08-1712 Yes

LT3071 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT3071EUFD#PBF 4x5 QFN-28 E $6.00 $4.20 Yes
LT3071EUFD#TRPBF 4x5 QFN-28 E $4.26 Yes
LT3071IUFD#PBF 4x5 QFN-28 I $6.86 $4.80 Yes
LT3071IUFD#TRPBF 4x5 QFN-28 I $4.86 Yes
LT3071MPUFD 4x5 QFN-28 MP $16.20 $11.34 No
LT3071MPUFD#PBF 4x5 QFN-28 MP $16.20 $11.34 Yes
LT3071MPUFD#TR 4x5 QFN-28 MP $16.20 $11.40 No
LT3071MPUFD#TRPBF 4x5 QFN-28 MP $16.20 $11.40 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1434A LT3071EUFD Demo Board | 5A, Low Noise, Digitally Prog Output, 85mV Dropout Linear Regulator, Analog Margining, 1.32V ≤ VIN ≤ 3V, Vout = 0.8V to 1.8V @ 5A $175.00
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  • Post Buck Regulation and Supply Isolation

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