Home Components Hardware Boards Books Kits
Futurlec - The Electronic Components and Semiconductor Superstore
 Search
Order Status Order Status

Corporate

dotAbout Us
dotDelivery
dotGuarantee

Services

dotPCB Manufacture
dotPCB Design
dotBoard Assembly

Need Help

dotContact Us
dotNews
dotLatest Products
dotOrdering Information

Hello. Welcome to Futurlec. The ELECTRONIC COMPONENTS Superstore. To find the component your looking for, either search by Part Number or visit the relative department. Need Help.


TOP STORIES


Linear Technology Releases New Dual String 2MHz Boost 50mA LED Driver


The LT3909 offers PWM dimming ratios up to 40,000:1 and Requires Just a Single Set Resistor for LED Current


Click for Larger Image - Linear Technology Releases New Dual String 2MHz Boost 50mA LED Driver

Linear Technology has released the LT3909, a high efficiency, constant current LED driver that can drive two strings of up to 10 LEDs at 50mA. To ensure constant brightness, each LED string contains an accurate high side current source with ±1.8% current matching. Its input voltage range of 2.9V to 40V makes it ideal for applications ranging from single/multiple LiIon inputs to automotive and industrial applications.

The LT3909 offers PWM dimming ratios up to 40,000:1, providing an LED backlighting solution in applications such as automotive and avionic displays subject to a wide range of ambient lighting conditions. The LT3909 delivers up to 36V of LEDs per string, and its output voltage adapts to any variation in LED Vf for optimum efficiency. Although designed to drive LEDs in a boost topology, LED current is accurately regulated even when Vin is greater Vout. The LT3909 operates at a constant switching frequency of 2MHz, enabling the use of very small externals while avoiding critical frequency bands such as AM radio in automotive applications. The combination of its tiny externals and 3mm x 3mm DFN (or MSOP12E) package offers a very compact solution footprint for LED applications requiring two strings of 50mA LEDs.

The LT3909 utilizes an internal 400mΩ, 40V, 1A switch with an integrated Schottky diode onchip, eliminating both the added cost and space required of an external diode. A unique high side LED current sense topology enables the LED cathode to be connected directly to ground, creating a single wire current source. A single resistor sets LED current from 10mA to 50mA for both high side current sources. The LT3909 offers both open and shorted LED protection with a fault flag to indicate these conditions. Even if one LED string experiences an open-LED or short-to-GND failure, the other string will remain in regulation. Other features include internal compensation, softstart and micropower shutdown.

The LT3909EDD is available in a 12-lead 3mm x 3mm DFN package and the LT3909EMSE is available in a thermally enhanced 12lead MSOP package. Industrial temperature versions, the LT3909IDD and LT3909IMSE, are tested and guaranteed to operate from a -40°C to 125°C operating junction temperature. High temperature versions, the LT3909HDD and LT3909HMSE, are tested and guaranteed to operate from a 40°C to 150°C operating junction temperature.


Key Features of the LT3909

  • Up to 36V of LEDs, 2-String x 50mA LED Driver
  • Wide Input Range: 2.9V to 40V
  • Up to 40,000:1 PWM Dimming
  • ±1.8% LED Current Matching (Type ±0.3%)
  • Integrated Schottky Diode
  • Internal 400mΩ, 40V, 1A Switch
  • Single Resistor Sets LED Current (10mA to 50mA) for Both High Side Current Sources
  • Output Adapts to LED Vf for Optimum Efficiency
  • LED Current Regulated Even for Vin > Vout
  • Fault Flag+ Protection for Open-LED and LED-Short-to-GND (Other String Remains in Regulation)
  • Programmable Maximum Vout
  • Internal Compensation, Soft-Start and Thermal Regulation
  • Accurate EN/UVLO Threshold
  • Fixed 2MHz Switching Frequency

The company's Web site address is www.linear.com.
[Reprinted with kind permission from Linear Technology - Release Date: 20th October, 2015]


Headlines

arrowST Release New Audio Software

arrowMicrochip Release ATtiny1617 Microcontrollers

arrowAnalog Devices and Linear Technology to Combine

arrowNew 12V Step-Down Power Modules

arrowLT Releases Bidirectional Circuit Breaker

arrowRenesas Electronics Acquires Intersil

Other Stories

arrowQualcomm To Acquire NXP

arrowNew Microcontroller with 256KB FRAM Memory

arrowNew MEMS Switch Technology

arrowNew Drone Battery Management Design

arrowST’s New Miniature Multi-Sensor Module

arrowNew Low-Power, Long-Range Radio Chip

arrowNew AVR Microcontrollers

arrowNew STM8 C-Compiler

arrowMicrochip to Acquire Atmel

arrowNew Time-of-Flight IC with Object Detection

arrowNXP Release Automotive Ethernet Solutions

arrowNew Galvanic Skin Response Design

arrowMicrochip Releases JukeBlox® 4 Platform

arrowNew 2-Pin Self-Powered Serial EEPROM

arrowNXP and Freescale Announce Merger

arrowMicrochip's New Motion Module

arrowNew Heads-up Swimming Monitor

arrow New Ultrasonic Flow Meter Design

arrowLinear Technology's New Power Monitoring IC

arrowNew Multi-Tuner Car-Radio IC from STMicroelectronics

arrowAtmel Release New ATmega Microcontrollers

arrowNew Low-Cost PIC32 Microcontrollers

arrowNew MPLAB Harmony Firmware from Microchip

arrowAtmel Release Studio 6.2 IDE

arrowNew High Accuracy Pressure Sensor

arrowNew Smart Meter IC from Microchip

arrowDynamic NFC Tags for Comsumer Appliances

arrowNew Floating Switch Architecture for LED Lighting

arrowNew Power Monitoring IC from Microchip

arrowSTMicroelectronics Releases Unique HomePlug Smart System-on-Chip

arrowAnalog Devices Release New Mixed-Signal ARM-M4 Processor

arrowNew Wireless Power Chip for Qi Charging Stations

arrowHigh-Performance Single-Chip AM/FM Radio Tuners

arrowNew Flourescent Ballast Control IC

arrowNew Ultra-Wideband High Linearity Mixer

arrowNew Near Field Communication Tags

arrowNew Freescale 5V 32-bit ARM Cortex-M0 MPUs

arrowNew DockPort Solution Enables Video, USB and Power Over a Single Cable

arrowWorld's Smallest e-Compass Module

arrowNew Class-AB Audio Amplifers from NXP

arrowTI Releases Li-Ion Battery Fast Charge Chipset

arrowNew Atmel Cortex-A5 MPU Loaded with Features

arrowNew Sound Chip Delivers Excellent Sound Quality

arrowNew PIC Microcontrollers with Integrated Op-Amps

arrowMicrochip Releases New High Density 1Mbit Serial SRAM

arrowNew e-Compass Module with Motion and Magnetic Sensors

arrowMicrochip Releases New USB PIC® Microcontrollers

arrowRevolutionary New Audio IC Delivers 5 Times the Power

arrowNew Atmel ARM Cortex-M4 Microcontroller

arrowNew Fully Integrated Ultrasonic Signal Conditioner

arrowNew Java Design Platform for STM32 Microcontrollers

arrowNXP Adds New GreenChip IC for Use With Mains LED Lighting

arrowMicrochip Releases Improved C Compiler for PIC Microcontrollers

arrowNew Atmel Studio 6 Release with Support for ARM Microcontrollers

arrowFreescale Releases New Kinetis Microcontrollers with 16-bit ADC

arrowNew Low-Voltage Digital Thermometers/Thermostats from Maxim

arrowNXP Adds New Low Power ARM Microcontrollers

arrowAnalog Devices New MEMS Accelerometers




How To Order  |  What's New  |  Your Account  |  Order Status  |  Help

About Us  |  Contact Us

Copyright Information © 2017, Futurlec