Eight-Channel LED Backlight Driver Boost, High Frequency Direct PWM Dimming
Manufacturer's part number :
The AAT1409 is a highly integrated, high efficiency LED backlight solution for notebook computers, monitors and portable TVs. The device operates from DC inputs, cigarette 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. Eight precision current sinks are programmed up to 45mA per string through one external RSET resistor, supporting up to 881 white LEDs at 360mA 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 requirement, 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 AAT1409 is available in the Pb-free, thermally enhanced 24-pin 3x4 TQFN package.
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Technical Data :
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- VIN Range: 4.5V to 5.5V / 5.0V to 26.0V
- LX Rated to 50V
- Maximum IOUT: 360mA
- Up to 92% Efficiency
- High Efficiency Light-Load Mode
- 8 LED Current Sinks up to 45mA/each
- ±2% Accuracy (21mA)
- ±2% Matching (21mA)
- Flexible Configurations
- Disable or Parallel
- Switching Frequency Options
- 675kHz or 1.3MHz
- Synchronize to System Clock
- PWM Direct Dimming Input
- Up to 100kHz Prevents Audio Interference
- Fast Turn-On/Off
- Wide 1,000:1 Dimming Range (100Hz)
- Fault Tolerant: Open/Short 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
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