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

Features

  • Click Here for LT1932 Evaluation Kit
  • 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
LT1932
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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.
 
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Packaging

ThinSOT

LT1932
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1932ES6 SOT 6 E $2.14   View
LT1932ES6#PBF SOT 6 E $2.14   View
LT1932ES6#TRMPBF SOT 6 E $2.14 $1.83 View
LT1932ES6#TRPBF SOT 6 E $2.14 $1.81 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.

Evaluation Kits

Part Number Description Price
DC390A LT1932ES6 | High Efficiency Constant-Current Single Cell Li-Ion White LED (6) Driver with On-Board Battery $75.00
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Applications

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

LTSpice / SwitcherCAD III is a powerful FREE circuit simulator and schematic capture program, providing macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

  • Step 1. If you do not already have a copy of LTSpice, click here to download and install LTSpice / SwitcherCAD III

  • Step 2. Once LTSpice is installed, click here for a ready to run  demonstration circuit of the LT1932.

  • Step 3. If LTspice / SwitcherCAD III does not automatically open after clicking the above link, 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 demonstartion circuit by selecting "Open" from the "File" menu.
 
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