LT1618 - Constant-Current/Constant-Voltage 1.4MHz Step-Up DC/DC Converter

Features

  • Accurate Input/Output Current Control: ±5% Over Temperature
  • Accurate Output Voltage Control: ±1%
  • Wide VIN Range: 1.6V to 18V
  • 1.4MHz Switching Frequency
  • High Output Voltage: Up to 35V
  • Low VCESAT Switch: 200mV at 1A
  • Available in (3mm x 3mm x 0.8mm) 10-Pin DFN and 10-Pin MSOP Packages

Typical Application

LT1618 Typical Application
LT1618 Typical Application

Description

The LT1618 step-up DC/DC converter combines a traditional voltage feedback loop and a unique current feedback loop to operate as a constant-current, constant-voltage source. This fixed frequency, current mode switcher operates from a wide input voltage range of 1.6V to 18V, and the high switching frequency of 1.4MHz permits the use of tiny, low profile inductors and capacitors. The current sense voltage is set at 50mV and can be adjusted using the IADJ pin.

Available in the 10-Pin (3mm x 3mm) Exposed Pad DFN and 10-pin MSOP packages, the LT1618 provides a complete solution for constant-current applications.

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
LT1618EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT1618EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT1618EMS#PBF MS-10 MS E 05-08-1661 Yes
LT1618EMS#TRPBF MS-10 MS E 05-08-1661 Yes


LT1618 Package Drawing
LT1618 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
LT1618EDD#PBF 3x3 DFN-10 E $2.08 $1.75 Yes
LT1618EDD#TRPBF 3x3 DFN-10 E $1.85 Yes
LT1618EMS#PBF MS-10 E $2.08 $1.75 Yes
LT1618EMS#TRPBF MS-10 E $1.81 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
DC780B LT1618 Demo Board | CC/CV Boost, 3.3V ≤ VIN ≤ 4.2V, Vout = 12V@250mA(CV) or 3.5V@500mA(CC) $100.00
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Click here to view our complete list of demo boards

Applications

  • LED Backlight Drivers
  • USB Powered Boost/SEPIC Converters
  • Input Current Limited Boost/SEPIC Converters
  • Battery Chargers

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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:
LT1618

Technical Support