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Specifications
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AAT1407 DATA SHEET Six-Channel LED Backlight Driver with Integrated Boost and High Frequency Direct PWM Dimming 1Skyworks Sol

Specifications
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Content	AAT1407 DATA SHEET Six-Channel LED Backlight Driver with Integrated Boost and High Frequency Direct PWM Dimming 1Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202117A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 29, 2012 1. The maximum number of LEDs in each string is dependent upon the maximum VF of the diodes in that string. Under no event should the voltage at LX be exceeded. General Description The AAT1407 is a highly integrated, high efficiency LED backlight solution for notebook computers, monitors and portable TVs. The device operates from DC inputs, ciga- rette lighter adapters, or multi-cell Li-ion batteries over the 4.5V to 26V voltage range. An integrated boost (step-up) converter provides up to 45V output for driving series LEDs. Six precision current sinks are programmed up to 30mA per string through one external RSET resistor, supporting up to 661 white LEDs at 180mA total output current. LED strings may be disabled or operated in parallel for increased drive capability. The boost output voltage is set by the LED string with the highest voltage require- ment, allowing a wide range of LED characteristics. The PWM dimming range at 100Hz is up to 1,000:1. The boost switching frequency is selectable (up to 1.3MHz) to allow optimum efficiency and the smallest external L/C filtering components. Alternatively, the device may be synchronized to an external clock. Boost current mode control provides fast response to line and load transients. Integrated Light-Load mode ensures highest efficiency across the entire load range. Fault tolerant circuitry extends system life by disabling open LED strings. The unique high voltage current sinks prevent damage resulting from shorted LEDs. The AAT1407 is available in the Pb-free, thermally enhanced 24-pin 3x4 TQFN package. Features • VIN Range: 4.5V to 5.5V / 5.0V to 26.0V • LX Rated to 50V • Maximum IOUT: 180mA • Up to 92% Efficiency • High Efficiency Light-Load Mode • 6 LED Current Sinks up to 30mA/each ŀ ±2% Accuracy (21mA) ŀ ±2% Matching (21mA) • Flexible Configurations ŀ Disable or Parallel • Switching Frequency Options ŀ 675kHz or 1.3MHz ŀ Synchronize to System Clock • PWM Direct Dimming Input ŀ Up to 100kHz Prevents Audio Interference ŀ Fast Turn-On/Off ŀ Wide 1,000:1 Dimming Range (100Hz) • Fault Tolerant: Open/Shorted LED(s) • Current Limit Protection • Over-Voltage Protection • Over-Temperature Protection • Soft-Start Minimizes Inrush Current • TQFN34-24 Low Profile Package • -40°C to +85°C Temperature Range Applications • Monitors • Notebook Computers • Portable TV • Portable DVD Players • White LED Backlight
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Following Datasheets	202118A (19 pages) 202119A (20 pages) 202121A (17 pages) 202123C (17 pages) 202124A (15 pages) 202125A (15 pages) 202126A (20 pages) 202127A (15 pages) 202129A (15 pages) 202130A (13 pages)
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