LTC3466 Datasheet | Linear Technology

LT3466 Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes Features - - - - - - - - - - .. DESCRIPTIO U APPLICATIO S - - - - Drives Up to 20 White LEDs (10 in Series per Converter) from a 3.6V Supply Two Independent Step-Up Converters Capable of Driving Asymmetric LED Strings Independent Dimming and Shutdown Control of the Two LED Strings Internal Schottky Diodes Internal Soft-Start Eliminates Inrush Current Open LED Protection (39.5V Max VOUT) Fixed Frequency Operation Up to 2MHz 81% Efficiency Driving 16 White LEDs at 15m A (Eight per Driver) from a 3.6V Supply Wide Input Voltage Range: 2.7V to 24V Available in 10-Pin DFN and 16-Pin Thermally Enhanced TSSOP Packages LT®3466 is a dual full function step-up DC/DC converter specifically designed to drive up to 20 White LEDs (10 in series per converter) with a constant current. 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 two independent converters are capable of driving asymmetric LED strings. The dimming of the two LED strings can also be controlled independently. The LT3466 is ideal for providing backlight for main and sub-displays in cell phones and other handheld devices. The LT3466 operating frequency can be set with an external resistor over a 200k Hz to 2MHz range. A low 200m V feedback voltage minimizes power loss in the current setting resistor for better efficiency. Additional Features include output voltage limiting when LEDs are disconnected and internal soft-start. The LT3466 is available in the 10-pin (3mm × 3mm × 0.75mm) DFN and 16-pin thermally enhanced TSSOP packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Main/Sub Displays Digital Cameras, Sub-Notebook PCs PDAs, Handheld puters Automotive TYPICAL APPLICATIO 3V TO 5V 1µF L1 47µH SW1 LED1 2.2µF VOUT1 LT3466 FB1 CTRL1 10Ω OFF ON...