White LED Driver and Boost Converter in 3mm x 3mm DFN Package

LT3466-1 is a dual switching regulator that combines a white LED driver and a boost converter in a low profile, small footprint (3mm × 3mm × 0.75mm) DFN package. The LED driver can be configured to drive up to 10 White LEDs in series and the boost converter can be used for generating the LCD bias voltages or driving a secondary OLED display. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors and expensive factory calibration.

The LT3466-1 provides independent dimming and shutdown control of the two converters. The operating frequency can be set with an external resistor over a 200kHz to 2MHz range. The white LED driver features a low 200mV reference, thereby minimizing power loss in the current setting resistor for better efficiency. The boost converter achieves ±1.5% output voltage accuracy by the use of a precision 0.8V reference. Protection features include output overvoltage protection and internal soft-start. Wide input supply range allows operation from 2.7V to 24V.

Applications

* White LED and OLED Displays

* Digital Cameras, Sub-Notebook PCs PDAs, Handheld Computers

* TFT - LCD Bias Supply

* Automotive

* Drives Up to 10 White LEDs from a 3.6V Supply

* Two Independent Step-Up DC/DC Converters

* Independent Dimming and Shutdown Control of the Outputs

* ±1.5% Output Voltage Accuracy (Boost Converter)

* ±4% LED Current Programming Accuracy

* Internal Schottky Diodes

* Internal Soft-Start Eliminates Inrush Current

* Output Overvoltage Protection (39.5V Max VOUT)

* Fixed Frequency Operation Up to 2MHz

* 83% Efficiency Driving 8 White LEDs at 15mA from a 3.6V Supply

* Wide Input Voltage Range: 2.7V to 24V

* Tiny (3mm × 3mm) 10-Lead DFN Package