LT3744EUHE#PBF

LT3744 is a fixed frequency synchronous step-down DC/DC controller designed to drive a LED load at upto 20A continuous or 40A pulsed. The peak current mode controller will maintain ±3% LED current regulation over a wide output voltage range, from VEE to VIN. By allowing VEE to float to negative voltages, several LEDs in series can be driven from a single Li-Ion battery with a simple, single step-down output stage. PWM dimming is achieved with the PWM pins. The regulated LED current is set with analogue voltages at the CTRL pins. Regulated voltage and overvoltage protection are set with a voltage divider from the output to the FB pin. Additional features include an accurate external reference voltage, a control input for thermally derating regulation current, an accurate EN/UVLO pin, an open-drain output fault flag, OVLO, frequency synchronization, and thermal shutdown. It is used in application such as LED driver for DLP projectors, heads-up displays, high power LED etc.

• Upto 3000:1 PWM dimming, 20:1 analogue dimming
• ±3% current regulation accuracy, ±3% voltage regulation accuracy
• Unique inverting buck-boost topology allows grounded heat sink to be used for RGB LEDs
• Input voltage range is 3.3V to 36V
• Peak current mode with DC LED current sensing
• Open and shorted LED protection and fault reporting
• VIN pin quiescent current (non-switching operation) is 22mA typical
• Shutdown mode is 1µA maximum at (VEN/UVLO = 0V)
• Operating temperature is -40°C to 125°C
• Package style is 36-lead plastic QFN

Merknader

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