LT3430 - High Voltage, 3A, 200kHz Step-Down Switching Regulator

Features

  • Wide Input Range: 5.5V to 60V
  • 3A Peak Switch Current over All Duty Cycles
  • Constant Switching Frequency:
    200kHz (LT3430)
    100kHz (LT3430-1)
  • 0.1Ω Switch Resistance
  • Current Mode
  • Effective Supply Current: 2.5mA
  • Shutdown Current: 30µA
  • 1.2V Feedback Reference Voltage
  • Easily Synchronizable
  • Cycle-by-Cycle Current Limiting
  • Small, 16-Pin Thermally Enhanced TSSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT3430 Typical Application
LT3430 Typical Application

Description

The LT3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and excellent loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry* maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and a SYNC pin can be externally synchronized with a logic level input from 228kHz to 700kHz for the LT3430 or from 125kHz to 250kHz for the LT3430-1.

The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP 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
LT3430EFE-1#PBF TSSOP-16 FE E 05-08-1663 (BB) Yes
LT3430EFE-1#TRPBF TSSOP-16 FE E 05-08-1663 (BB) Yes
LT3430EFE#PBF TSSOP-16 FE E 05-08-1663 (BB) Yes
LT3430EFE#TRPBF TSSOP-16 FE E 05-08-1663 (BB) Yes
LT3430IFE-1#PBF TSSOP-16 FE I 05-08-1663 (BB) Yes
LT3430IFE-1#TRPBF TSSOP-16 FE I 05-08-1663 (BB) Yes
LT3430IFE#PBF TSSOP-16 FE I 05-08-1663 (BB) Yes
LT3430IFE#TRPBF TSSOP-16 FE I 05-08-1663 (BB) Yes


LT3430 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
LT3430EFE-1#PBF TSSOP-16 E $7.07 $4.95 Yes
LT3430EFE-1#TRPBF TSSOP-16 E $5.07 Yes
LT3430EFE#PBF TSSOP-16 E $7.07 $4.95 Yes
LT3430EFE#TRPBF TSSOP-16 E $5.07 Yes
LT3430IFE-1#PBF TSSOP-16 I $8.13 $5.69 Yes
LT3430IFE-1#TRPBF TSSOP-16 I $5.81 Yes
LT3430IFE#PBF TSSOP-16 I $8.13 $5.69 Yes
LT3430IFE#TRPBF TSSOP-16 I $5.81 Yes
Buy NowRequest Samples
* 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
DC1200A LT3430EFE-1 Demo Board | 5.5V ≤ VIN ≤ 60V, VOUT = 3.3V @ 2A Contact Factory
DC471A LT3430EFE | High Voltage Buck Converter, Vin = 7.5V to 60V, Vout = 5V @ 2A $100.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3430IFE-1#PBF TSSOP-16 I $8.13 $5.69 Yes
LT3430IFE-1#TRPBF TSSOP-16 I $5.81 Yes
LT3430IFE#PBF TSSOP-16 I $8.13 $5.69 Yes
LT3430IFE#TRPBF TSSOP-16 I $5.81 Yes
Buy NowRequest Samples
* 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.

Applications

  • Industrial and Automotive Power Supplies
  • Portable Computers
  • Battery Chargers
  • Distributed Power Systems

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:
LT3430
LT3430-1

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LT3430
LT3430-1

Technical Support