LT3491IS5

The LT3491IS5 is one type of LT3491. The following is some information about the LT3491. It is a kind of fixed frequency step-up DC/DC converter. It is specifically designed to drive up to six white LEDs in series from a Li-Ion cell. The typical applications include cellular phones, PDAs, handheld computers, digital cameras, MP3 players and GPS receivers.
 
There are some features of LT3491IS5. (1) drives up to six white LEDs from a 3 V supply; (2) high side sense allows "one wire current source"; (3) internal schottky diode; (4) one pin dimming and shutdown; (5) 27 V open LED protection; (6) 2.3 MHz switching frequency; (7) ±5% reference accuracy; (8) VIN range: 2.5 V to 12 V; (9) requires only 1µF output capacitor; (10) wide 300:1 true color PWMTM dimming range; (11) 8-Lead SC70 package; (12) low profile 6-Lead DFN package (2mm*2mm*0.75mm).

What comes next is the absolute maximum ratings of LT3491IS5. (1): input voltage (VIN) is 12 V; (2): SW voltage is 32 V; (3): CAP voltage is 32 V; (4): CTRL voltage is 12 V; (5): LED voltage is 32 V; (6): operating temperature range is from -40 to +85; (7): lead temperature (soldering, 10 seconds) is 300; (8): storage temperature range is from -65 to 150; (9): maximum junction temperature is 125.