LT3471 - Dual 1.3A, 1.2MHz Boost/Inverter in 3mm × 3mm DFN


  • 1.2MHz Switching Frequency
  • Low VCESAT Switches: 330mV at 1.3A
  • High Output Voltage: Up to 40V
  • Wide Input Range: 2.4V to 16V
  • Inverting Capability
  • 5V at 630mA from 3.3V Input
  • 12V at 320mA from 5V Input
  • –12V at 200mA from 5V Input
  • Uses Tiny Surface Mount Components
  • Low Shutdown Current: <1µA
  • Low Profile (0.75mm) 10-Lead 3mm × 3mm DFN Package

Typical Application

LT3471 Typical Application
LT3471 Typical Application


The LT3471 dual switching regulator combines two 42V, 1.3A switches with error amplifiers that can sense to ground providing boost and inverting capability. The low VCESAT bipolar switches enable the device to deliver high current outputs in a small footprint. The LT3471 switches at 1.2MHz, allowing the use of tiny, low cost and low profile inductors and capacitors. High inrush current at start-up is eliminated using the programmable soft-start function, where an external RC sets the current ramp rate. A constant frequency current mode PWM architecture results in low, predictable output noise that is easy to filter.

The LT3471 switches are rated at 42V, making the device ideal for boost converters up to ±40V as well as SEPIC and flyback designs. Each channel can generate 5V at up to 630mA from a 3.3V supply, or 5V at 510mA from four alkaline cells in a SEPIC design. The device can be configured as two boosts, a boost and inverter or two inverters.

The LT3471 is available in a low profile (0.75mm) 10-lead 3mm × 3mm DFN 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
LT3471EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT3471EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes

LT3471 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
LT3471EDD#PBF 3x3 DFN-10 E $3.33 $2.80 Yes
LT3471EDD#TRPBF 3x3 DFN-10 E $2.90 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
DC1280A LT3471EDD Demo Board | Dual 12Vout @ 300mA & -12Vout @ 200mA Boost/Inverter in 3x3 DFN $125.00
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Design Tools


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:

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