LT3491

Features: Drives Up to Six White LEDs from a 3V Supply High Side Sense Allows One Wire Current Source Internal Schottky Diode One Pin Dimming and Shutdown 27V Open LED Protection 2.3MHz Switching Frequency ±5% Reference Accuracy VIN Range: 2.5V to 12V Requires Only 1µF Output Capacitor Wi...

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SeekIC No. : 004401100 Detail

LT3491: Features: Drives Up to Six White LEDs from a 3V Supply High Side Sense Allows One Wire Current Source Internal Schottky Diode One Pin Dimming and Shutdown 27V Open LED Protection 2.3MHz Switching...

floor Price/Ceiling Price

Part Number:
LT3491
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/12/21

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Product Details

Description



Features:

Drives Up to Six White LEDs from a 3V Supply
High Side Sense Allows "One Wire Current Source"
Internal Schottky Diode
One Pin Dimming and Shutdown
27V Open LED Protection
2.3MHz Switching Frequency
±5% Reference Accuracy
VIN Range: 2.5V to 12V
Requires Only 1µF Output Capacitor
Wide 300:1 True Color PWMTM Dimming Range
8-Lead SC70 Package
Low Profile 6-Lead DFN Package(2mm * 2mm * 0.75mm)



Application

Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
GPS Receivers



Pinout

  Connection Diagram


Specifications

Input Voltage (VIN) ................................................. 12V
SW Voltage ............................................................. 32V
CAP Voltage ............................................................ 32V
CTRL Voltage .......................................................... 12V
LED Voltage ............................................................ 32V
Operating Temperature Range (Note 2) . 40 to 85
Maximum Junction Temperature ......................... 125
Storage Temperature Range ................ 65 to 150
Lead Temperature (Soldering, 10sec, SC-70) ......... 300



Description

The LT®3491 is a fixed frequency step-up DC/DC converter specifically designed to drive up to six white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The LT3491 features a unique high side LED current sense that enables the part to function as a "one wire current source;" one side of the LED string can be returned to ground anywhere, allowing a simpler one wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.

The 2.3MHz switching frequency allows the use of tiny inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. Few external components are needed: open-LED protection and the Schottky diode are all contained inside the tiny SC70 and 2mm * 2mm DFN packages. With such a high level of integration, the LT3491 provides a high efficiency LED driver solution in the smallest of spaces.

 




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