LT8471 - Dual Multitopology DC/DC Converters with 2A Switches and Synchronization

Features

  • Dual 2A and One 500mA, 50V Internal Power Switch Channels
  • 2A Primary Channels Can Be Buck, Boost, SEPIC, ZETA, Flyback or Inverting DC/DC Converter
  • 500mA Skyhook Channel Efficiently Generates Boosted Input Voltage
  • Wide Input Voltage Range of 2.6V to 50V
  • UVLO and OVLO Programmable on OV/UV Pin
  • Soft-Start Programmable for Each Channel
  • Fixed Frequency PWM (Set by RT Pin or Synchronized to External Clock)
  • Anti-Phase Switching Reduces Input Ripple
  • 20-Lead TSSOP and 28-Lead QFN Packages

Typical Application

LT8471 Typical Application
LT8471 Typical Application

Description

The LT®8471 is a dual PWM DC/DC converter containing two internal 2A, 50V switches and an additional 500mA switch to facilitate step-down and inverting conversion. Each 2A channel can be independently configured as a buck, boost, SEPIC, flyback or inverting converter. Capable of generating positive and negative outputs from a single input rail, the LT8471 is ideal for many local power supply designs.

The LT8471 has an adjustable oscillator, set by a resistor placed from the RT pin to ground. Additionally, the LT8471 can be synchronized to an external clock. The free running or synchronized switching frequency range of the part can be set between 100kHz and 2MHz.

Additional features such as frequency foldback, soft-start, and power good are integrated. The LT8471 is available in 20-lead TSSOP and 28-Lead (4mm × 5mm) QFN packages.

Packaging

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

Part Number Package Code Temp Package
Drawing
RoHS
LT8471EFE#PBF TSSOP-20 FE E 05-08-1663 (CB) Yes
LT8471EFE#TRPBF TSSOP-20 FE E 05-08-1663 (CB) Yes
LT8471EUFD#PBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT8471EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT8471HFE#PBF TSSOP-20 FE H 05-08-1663 (CB) Yes
LT8471HFE#TRPBF TSSOP-20 FE H 05-08-1663 (CB) Yes
LT8471IFE#PBF TSSOP-20 FE I 05-08-1663 (CB) Yes
LT8471IFE#TRPBF TSSOP-20 FE I 05-08-1663 (CB) Yes
LT8471IUFD#PBF 4x5 QFN-28 UFD I 05-08-1712 Yes
LT8471IUFD#TRPBF 4x5 QFN-28 UFD I 05-08-1712 Yes


LT8471 Package Drawing
LT8471 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
LT8471EFE#PBF TSSOP-20 E $5.36 $3.75 Yes
LT8471EFE#TRPBF TSSOP-20 E $3.81 Yes
LT8471EUFD#PBF 4x5 QFN-28 E $5.36 $3.75 Yes
LT8471EUFD#TRPBF 4x5 QFN-28 E $3.81 Yes
LT8471HFE#PBF TSSOP-20 H $6.26 $4.38 Yes
LT8471HFE#TRPBF TSSOP-20 H $4.44 Yes
LT8471IFE#PBF TSSOP-20 I $5.90 $4.13 Yes
LT8471IFE#TRPBF TSSOP-20 I $4.19 Yes
LT8471IUFD#PBF 4x5 QFN-28 I $5.90 $4.13 Yes
LT8471IUFD#TRPBF 4x5 QFN-28 I $4.19 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
DC1854A LT8471EFE Demo Board | Dual Buck/Inverting, 6V ≤ VIN ≤ 32V, Vout1 = 5V @ 1.4A, Vout2 = -5V @ 0.8A $150.00
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Click here to view our complete list of demo boards

Applications

  • Dual Rail Power for Signal Chain.
  • Buck/Buck, Buck/Boost, Boost/Boost, Boost/Invert, Invert/Invert, Buck/Invert

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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 IV:
LT8471

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