LTC3490
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LTC3490

Single Cell 350mA LED Driver

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Info: : PRODUCTION tooltip
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Part Details
Part Models 4
1ku List Price Starting From $2.55
Features
  • 350mA Constant Current Output
  • 2.8V to 4V Output Compliance
  • 1- or 2-Cell NiMH or Alkaline Input
  • Synchronous Rectification: Up to 90% Efficiency
  • Fixed Frequency Operation: 1.3MHz
  • Low Quiescent Current: <1mA
  • Very Low Shutdown Current: <50µA
  • Open LED Output Limited to 4.7V
  • VIN Range: 1V to 3.2V
  • Dimming Control
  • Undervoltage Lockout to Protect Batteries
  • Low Profile (0.75mm) 3mm × 3mm Thermally Enhanced 8-Lead DD and S8 Packages
Additional Details
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The LTC3490 provides a constant current drive for 1W LED applications. It is a high efficiency boost converter that operates from 1 or 2 NiMH or alkaline cells and generates 350mA of constant current with up to 4V of compliance. It contains a 100mΩ NFET switch and a 130mΩ PFET synchronous rectifier. The fixed switching frequency is internally set to 1.3MHz.

The LTC3490 limits the output voltage to 4.7V if the output load is disconnected. It also features an analog dimming capability that reduces the drive current proportional to the CTRL/SHDN pin voltage. A low-battery logic output signals when the battery has dropped below 1V/cell. An undervoltage lockout circuit shuts down the LTC3490 when the battery voltage drops below 0.85V/cell. The feedback loop is internally compensated to minimize component count.

Applications

  • Portable Lighting
  • Rechargeable Flashlights
Part Models 4
1ku List Price Starting From $2.55

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3490EDD#PBF
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LTC3490EDD#TRPBF
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LTC3490ES8#PBF
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LTC3490ES8#TRPBF
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Product Lifecycle

PCN

Oct 12, 2022

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

Jun 16, 2021

- 21_0026

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LTC3490ES8#PBF

PRODUCTION

LTC3490ES8#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 12, 2022

- 22_0255

arrow down

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

Jun 16, 2021

- 21_0026

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LTC3490ES8#PBF

PRODUCTION

LTC3490ES8#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC762A

LTC3490EDD Demo Board | Boost White LED Driver, 1.8V ≤ VIN ≤ 3.5V, VLED up to 4V @ 350mA

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DC762A

LTC3490EDD Demo Board | Boost White LED Driver, 1.8V ≤ VIN ≤ 3.5V, VLED up to 4V @ 350mA

LTC3490EDD Demo Board | Boost White LED Driver, 1.8V ≤ VIN ≤ 3.5V, VLED up to 4V @ 350mA

Product Detail

Demonstration circuit 762 is a 350mA, 1W synchronous boost white LED driver featuring the LTC3490 and a Lumileds Luxeon LED. The input voltage range of the LT3490 is 1V to 3.4V; however the demo board operates with a 1.8V to 3.5V range. The board comes with two AA alkaline battery cells to be stuffed in the battery pack on the back of the PCB. The LED compliance voltage range is 2.8V to 4V. Other features include a low battery detect output and analog dimming control. The LT3490's simple design, low quiescent current and minimal external components make it an ideal solution for space-constrained ~1W flashlight or portable LED driver solutions.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, 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.

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