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LBRX Datasheet(PDF) 1 Page - Linear Technology |
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LBRX Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LT3466-1 34661f White LED Driver and Boost Converter in 3mm × 3mm DFN Package Figure 1. Li-Ion Powered Driver for 6 White LEDs and OLED Display ■ 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 ■ White LED and OLED Displays ■ Digital Cameras, Sub-Notebook PCs ■ PDAs, Handheld Computers ■ TFT - LCD Bias Supply ■ Automotive LT ®3466-1 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 shut- down control of the two converters. The operating fre- quency 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 out- put overvoltage protection and internal soft-start. Wide input supply range allows operation from 2.7V to 24V. 3V TO 5V 16V 30mA 33 µH 1 µF 1 µF1µF 6 LEDs 33 µH SHUTDOWN AND DIMMING CONTROL 2 SHUTDOWN AND DIMMING CONTROL 1 10 Ω 24.9k 475k 34661 F01a 63.4k CTRL1 GND CTRL2 RT SW1 SW2 VIN LT3466-1 VOUT1 FB1 VOUT2 FB2 Conversion Efficiency OUTPUT CURRENT (mA) 0 70 75 30 25 20 34661 F01b 60 50 65 55 510 15 90 85 80 BOOST CONVERTER LED DRIVER VIN = 3.6V DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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