LT3591EDDB#TRMPBF

LT3591 is a fixed frequency step-up DC/DC converter specifically designed to drive upto ten white LEDs in series 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. This device 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 one wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string. The high switching frequency allows the use of tiny inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. It is used in application such as cellular phones, PDAs, handheld computers, digital cameras, MP3 players, GPS receivers etc.

• Internal schottky diode
• One pin dimming and shutdown
• 80:1 true colour PWMTM dimming range
• 42V open LED protection
• Switching frequency is 1MHz typical
• Input voltage range is 2.5V to 12V
• Requires only 2.2µF output capacitor
• Supply current is 4mA typical at (VCAP = 24V, VLED = 23V)
• Operating temperature is -40°C to 85°C
• Package style is 8-lead plastic DFN

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