LT1932 - Constant-Current DC/DC LED Driver in ThinSOT

Features

  • Up to 80% Efficiency
  • Inherently Matched LED Current
  • Drives Five White LEDs from 2V
  • Drives Six White LEDs from 2.7V
  • Drives Eight White LEDs from 3V
  • Adjustable Control of LED Current
  • Disconnects LEDs In Shutdown
  • 1.2MHz Fixed Frequency Switching
  • Uses Tiny Ceramic Capacitors
  • Uses Tiny 1mm-Tall Inductors
  • Regulates Current Even When VIN > VOUT
  • Operates with VIN as Low as 1V
  • Low Profile (1mm) ThinSOT™ Package
 

Typical Application

LT1932 Typical Application
LT1932 Typical Application

Description

The LT1932 is a fixed frequency step-up DC/DC converter designed to operate as a constant-current source. Because it directly regulates output current, the LT1932 is ideal for driving light emitting diodes (LEDs) whose light intensity is proportional to the current passing through them, not the voltage across their terminals.

With an input voltage range of 1V to 10V, the device works from a variety of input sources. The LT1932 accurately regulates LED current even when the input voltage is higher than the LED voltage, greatly simplifying battery-powered designs. A single external resistor sets LED current between 5mA and 40mA, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal. When the LT1932 is placed in shutdown, the LEDs are disconnected from the output, ensuring a quiescent current of under 1µA for the entire circuit. The device’s 1.2MHz switching frequency permits the use of tiny, low profile chip inductors and capacitors to minimize footprint and cost in space-conscious portable 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
LT1932ES6#PBF SOT-23 S6 E 05-08-1636 Yes
LT1932ES6#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LT1932ES6#TRPBF SOT-23 S6 E 05-08-1636 Yes


LT1932 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
LT1932ES6#PBF SOT-23 E $2.14 Yes
LT1932ES6#TRMPBF SOT-23 E $2.14 $1.83 Yes
LT1932ES6#TRPBF SOT-23 E $2.14 $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.

Click here to view our complete list of demo boards

Applications

  • Cellular Telephones
  • Handheld Computers
  • Digital Cameras
  • Portable MP3 Players
  • Pagers
 

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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:
LT1932

Technical Support