LT3797EUKG#PBF

LT3797 is a triple output DC/DC controller designed to drive three strings of LEDs. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. It includes an integrated DC/DC converter to produce a regulated 7.5V supply for the N-channel MOSFET gate drivers of the three channels. This high efficiency converter enables the part to operate from a wide input voltage range from 2.5V to 40V. It is designed so that each converter can use the most suitable configuration to drive its LED load, whether step-up, step-down or a combination. Two key features enable this flexibility: first the device can sense output current at the high side of the LED string; and second, the voltage feedback pin, FBH, is referred to the ISP current sensing input. The CTRL inputs provide output current analogue dimming capability. It is used in application like automotive and industrial lighting, RGB lighting, billboards and large displays etc.

• VIN transient ride-through upto 60V
• Rail-to-rail LED current sense is 0V to 100V
• 3000:1 PWM dimming, TG drivers for PMOS LED disconnection
• Open-LED protection, short-circuit protected boost capable
• Fault flags for independent channels, programmable VIN undervoltage and overvoltage lockout
• Synchronizable to an external clock, CTRL pins provide analogue dimming
• Programmable soft-start, VIN shutdown is 1µA maximum
• Switching frequency is 100KHz typical at (RT = 154Kohm)
• Operating temperature is -40°C to 125°C
• Package style is 52-lead plastic QFN

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