DC1124A

DC1124A demonstration circuit features the LT3591, LED driver with integrated Schottky. The LT3591 is a fixed frequency step-up current mode DC/DC converter that drives up to ten white LEDs in series. The high switching frequency allows using tiny components for the circuit. External components are minimized by integrating the Schottky diode and the open circuit protection into the package. The high side current sensing feature of the LT3591 allows “one wire” current source, i.e. the low side of the LED string can return to ground anywhere.

• Input voltage range of the demo board is from 3V to 9V
• 20mA max output current at VIN = 3V, 10 LEDs
• 78.2% efficiency at VIN = 3V, 10 LEDs
• 44V max CAP pin over voltage protection at LED open
• 5mA max quiescent current at VIN = 3V, VCTRL=3V
• 11µA max quiescent current while in shutdown at VIN = 3V,VCTRL=0V
• 1.2MHz max switching frequency
• Different dimming controls can be implemented on the demo board