LT3497EDDB#TRMPBF

LT3497 is a dual full function step-up DC/DC converter specifically designed to drive upto 12 white LEDs (6 white LEDs in series per converter) from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors and expensive factory calibration. The two independent converters are capable of driving asymmetric LED strings. Accurate LED dimming and shutdown of the two LED strings can also be controlled independently. It features a unique high side LED current sense that enables the part to function as a “one wire current source;” one side of the LED string can be returned to ground anywhere, allowing a simpler 1-wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string. It is used in application such as cellular phones, PDAs, handheld computers, digital cameras, MP3 players, GPS receivers etc.

• Internal schottky diodes
• Open LED protection (32V)
• Switching frequency is 2.3MHz typical
• VIN range is 2.5V to 10V
• Dual wide 250:1 true color PWMTM dimming
• Requires only 1µF output capacitor per converter
• Supply current is 6mA typical at (VCAP1 = VCAP2 = 16V)
• Maximum duty cycle is 92% typical
• Operating temperature is -40°C to 85°C
• Package style is 10-lead plastic DFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party