LT3070 - 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator

Features

  • Output Current: 5A
  • Dropout Voltage: 85mV Typical
  • Digitally Programmable VOUT : 0.8V to 1.8V
  • Digital Output Margining: ±1%, ±3% or ±5%
  • Low Output Noise: 25μVRMS (10Hz to 100kHz)
  • Parallel Multiple Devices for 10A or More
  • Precision Current Limit: ±20%
  • ±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

LT3070 Typical Application
LT3070 Typical Application

Description

The LT3070 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 LT3070’s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost. The LT3070’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. A margining function allows the user to adjust system output voltage in increments of ±1%, ±3% or ±5%. The IC incorporates a unique tracking function to control a buck regulator powering the LT3070’s input. This tracking function drives the buck regulator to maintain the LT3070’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 LT3070 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package.

Packaging

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
Drawing
RoHS
LT3070EUFD#PBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT3070EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT3070IUFD#PBF 4x5 QFN-28 UFD I 05-08-1712 Yes
LT3070IUFD#TRPBF 4x5 QFN-28 UFD I 05-08-1712 Yes
LT3070MPUFD 4x5 QFN-28 UFD MP 05-08-1712 No
LT3070MPUFD#PBF 4x5 QFN-28 UFD MP 05-08-1712 Yes
LT3070MPUFD#TR 4x5 QFN-28 UFD MP 05-08-1712 No
LT3070MPUFD#TRPBF 4x5 QFN-28 UFD MP 05-08-1712 Yes


LT3070 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
(1-99)
Price
(1k)*
RoHS
LT3070EUFD#PBF 4x5 QFN-28 E $6.00 $4.20 Yes
LT3070EUFD#TRPBF 4x5 QFN-28 E $4.26 Yes
LT3070IUFD#PBF 4x5 QFN-28 I $6.86 $4.80 Yes
LT3070IUFD#TRPBF 4x5 QFN-28 I $4.86 Yes
LT3070MPUFD 4x5 QFN-28 MP $16.20 $11.34 No
LT3070MPUFD#PBF 4x5 QFN-28 MP $16.20 $11.34 Yes
LT3070MPUFD#TR 4x5 QFN-28 MP $16.26 $11.40 No
LT3070MPUFD#TRPBF 4x5 QFN-28 MP $16.26 $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
DC1433A LT3070EUFD Demo Board | 5A, Low Noise, Digitally Prog Output, Very Low Dropout Linear Regulator, 1.2V ≤ VIN ≤ 3V, Vout = 0.8V to 1.8V @ 5A $175.00
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Click here to view our complete list of demo boards

Applications

  • FPGA and DSP Supplies
  • ASIC and Microprocessor Supplies
  • Servers and Storage Devices
  • Post Buck Regulation and Supply Isolation

Product Notifications

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT3070

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