LT3433 - High Voltage Step-Up/Step-Down DC/DC Converter

Features

  • Automatic Step-Up and Step-Down Conversion
  • Uses a Single Inductor
  • Wide 4V to 60V Input Voltage Range
  • VOUT from 3.3V to 20V
  • Dual Internal 500mA Switches
  • 100µA No-Load Quiescent Current
  • Low Current Shutdown
  • ±1% Output Voltage Accuracy
  • 200kHz Operating Frequency
  • Boosted Supply Pin to Saturate High Side Switch
  • Frequency Foldback Protection
  • Current Limit Foldback Protection
  • Current Limit Unaffected by Duty Cycle
  • 16-lead Thermally Enhanced TSSOP Package

Typical Application

LT3433 Typical Application
LT3433 Typical Application
LT3433 Typical Application

Description

The LT3433 is a 200kHz fixed-frequency current mode switching regulator that provides both step-up and stepdown regulation using a single inductor. The IC operates over a 4V to 60V input voltage range making it suitable for use in various wide input voltage range applications such as automotive electronics that must withstand both load dump and cold crank conditions.

Internal control circuitry monitors system conditions and converts from single switch buck operation to dual switch bridged operation when required, seamlessly changing between step-down and step-up voltage conversion.

Optional Burst Mode operation reduces no-load quiescent current to 100µA and maintains high efficiencies with light loads.

Current limit foldback and frequency foldback help prevent inductor current runaway during start-up. Programmable soft-start helps prevent output overshoot at start-up.

The LT3433 is available in a 16-lead thermally enhanced TSSOP package.

Packaging

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

TSSOP-16

LT3433 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3433EFE TSSOP 16 E $4.64 $3.25 View
LT3433EFE#PBF TSSOP 16 E $4.64 $3.25 View
LT3433EFE#TR TSSOP 16 E $3.37 View
LT3433EFE#TRPBF TSSOP 16 E $3.37 View
LT3433IFE TSSOP 16 I $5.36 $3.75 View
LT3433IFE#PBF TSSOP 16 I $5.36 $3.75 View
LT3433IFE#TR TSSOP 16 I $3.87 View
LT3433IFE#TRPBF TSSOP 16 I $3.87 View
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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
DC527A LT3433EFE | Step-Up/Step-Down Converter, 4V to 60V Input, Vout=5V/400mA @ 12Vin, See Load Current Table $125.00
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Applications

  • 12V Automotive Systems
  • Wall Adapter Powered Systems
  • Battery Power Voltage Buffering

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Design Tools

LTspiceIV

LTspice IV 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 IV

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 IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV 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:
LT3433

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