Demonstration circuit DC915 features the LT3466-1 high efficiency boost white LED driver and a step-up converter. There is one LED driver output for 6 or 8 WLEDs and a separate DC/DC converter that generates outputs for the LCD bias. VO1 drives 8 LEDs in series with 15mA LED current and VO2/VO3 can delivery ±15V at 10mA current. If the charge-pump circuitry which generates VO3 is removed (C4, C5 and D1), VO2 can deliver over 35mA of current. The input voltage range is 3V to 14V, but can go as low as 2.7V with slightly reduced output current.

The LT3478/LT3478-1 are 4.5A step-up DC/DC converters designed to drive LEDs with a constant current over a wide programmable range. Series connection of the LEDs provides identical LED currents for uniform brightness without the need for ballast resistors and expensive factory calibration.The LT3478-1 reduces external component count and cost by integrating the LED current sense resistor. The LT3478 uses an external sense resistor to extend the maximum programmable LED current beyond 1A and also to achieve greater accuracy when programming low LED currents. Operating frequency can be set with an external resistor from 200kHz up to 2.25MHz. Unique circuitry allows a PWM dimming range up to 3000:1 while maintaining constant LED color. The LT3478/LT3478-1 are ideal for high power LED driver applications such as automotive TFT LCD backlights, courtesy lighting and heads-up displays. One of two CTRL pins can be used to program maximum LED current. The other CTRL pin can be used to program a reduction in maximum LED current vs temperature to maximize LED usage and improve reliability.Additional features include inrush current protection, programmable open LED protection and programmable soft-start. Each part is available in a 16-pin thermally enhanced TSSOP Package.Applications High Power LED Driver Automotive Lighting

Demonstration circuit 986 is a Triple Step-Down LED Driver featuring the LT3496EUFD. The LT3496 is a triple output DC/DC converter designed to operate as current sources for driving high current LEDs. Each ofthe three regulators on the demo board is independently operated. The default current for each output channel is 500mA. The output current should not exceed the rated current of the LEDs used.  The maximum voltage of an LED string the demo board can drive is limited by the duty cycle and the input voltage of the LT3496. The maximum power input voltage (PVIN ) is 45V. As a result, each channel of the demo board can drive up to ~31V total LED voltage. The LT3496's input voltage range is 3V to 30V (with 40V transients), however to minimize power dissipation the demo board uses a 3V to 5.5V supply.

LIGHTING DEVELOPMENT KITS;

Charge Pump Regulator for Color TFT Panels

Four White LED Backlight Driver Features: Drives 4 LEDs from a 2.6 V to 5.5 V (Li-Ion) input supply 1×/1.5×/2× fractional charge pump to maximize power efficiency 0.3% typical LED current matching Up to 88% power efficiency over Li-Ion range Powers main and sub display LEDs with individual shutdown Package footprint only 9 mm2 (3 mm × 3 mm) Package height only 0.75 mm Low power shutdown mode Shutdown function Soft start limiting in-rush current

LED Lighting Drivers 1.0A LED Flash Driver

600mA Main/Camera LED Controller Features: Multimode Charge Pump Provides Up to 94% Efficiency (1x, 1.5x, 2x) Up to 600mA Total Output Current LTC3209-1: 8 Current Sources Available as 6 × 25mA MAIN, 1 × 400mA CAM and 1 × 15mA AUX LTC3209-2: 8 Current Sources Available as 5 × 25mA MAIN, 2 × 200mA CAM and 1 × 15mA AUX LED On/Off and Brightness Level Programmable Using 2-Wire I2C™ Interface Automatic Charge Pump Mode Switching or Fixed Mode for Power Supply Generation Low Noise Constant Frequency Operation Internal Soft-Start Limits Inrush Current During Start-up and Mode Switching Short Circuit/Thermal/Open-Shorted LED Protection 256 Brightness States for MAIN Display 16 Brightness States for CAM Display 4 Brightness States for AUX Display 20-Lead (4mm × 4mm) QFN Package

600mA Universal Multi-Output LED/CAM Driver Features: Low Noise, Multi-Mode Charge Pump (1x, 1.5x, 2x) Provides Up to 91% Efficiency Slew Limited Switching Reduces Conducted and Radiated Noise (EMI) Up to 600mA Total Output Current Twelve 28mA Universal Current Sources with 64-Step Linear Brightness Control 425mA CAM LED Current Source with 16-Step Linear Brightness Control and 2-Second High Current Safety Timer Independent On/Off, Brightness Level, Blinking and Gradation Control for Each Current Source Using 2-Wire I2C Interface Internal Current Reference Two I2C Addresses are Available (LTC3207 00110110, LTC3207-1 00110100) Configurable ENU Pin for Asynchronous LED On/Off Control Automatic or Forced Mode Switching Internal Soft-Start Limits Inrush Current Short-Circuit/Thermal Protection 4mm × 4mm 24-Pin QFN Plastic Package

600mA Universal Multi-Output LED/CAM Driver Features: Low Noise, Multi-Mode Charge Pump (1x, 1.5x, 2x) Provides Up to 91% Efficiency Slew Limited Switching Reduces Conducted and Radiated Noise (EMI) Up to 600mA Total Output Current Twelve 28mA Universal Current Sources with 64-Step Linear Brightness Control 425mA CAM LED Current Source with 16-Step Linear Brightness Control and 2-Second High Current Safety Timer Independent On/Off, Brightness Level, Blinking and Gradation Control for Each Current Source Using 2-Wire I2C Interface Internal Current Reference Two I2C Addresses are Available (LTC3207 00110110, LTC3207-1 00110100) Configurable ENU Pin for Asynchronous LED On/Off Control Automatic or Forced Mode Switching Internal Soft-Start Limits Inrush Current Short-Circuit/Thermal Protection 4mm × 4mm 24-Pin QFN Plastic Package