CAT32

CAT32 CMOS White LED Driver FEATURES www.datasheet4u.com H GEN FR ALO EE LE s Drives up to 4 White LEDs in series s Shutdown current less than 1µA A D F R E ETM s Low quiescent ground current (0.5mA typical) s Power efficiency over 80% s Compatible pinout with LT1932 s Adjustable output current (up to 40mA) s High frequency 1.2MHz operation s Input voltage operation down to 2.0V s Low resistance (0.5Ω) high voltage s Load fault protection against open-circuits s Low value external components s Low profile (1mm) 6-lead SOT23 and TDFN (0.8mm) package power switch APPLICATIONS s Color LCD and keypad backlighting s Cellular phones s Handheld terminals s Digital cameras s PDAs/Games s Portable MP3 players DESCRIPTION The CAT32 is a DC/DC step up converter that delivers a regulated output current. Operation at a constant switching frequency of 1.2MHz allows the device to be used with very small value external inductor and ceramic capacitors. The CAT32 is targeted to drive multiple white lightemitting diodes (LEDs) connected in series and provides the necessary regulated current to control the brightness and the color purity. An external resistor RSET controls the output current level. LED currents of up to 40mA can be supported over a wide range of input supply voltages from 2V to 7V, making the device ideal for battery-powered applications. A high voltage output stage allows up to 4 White LEDs to be driven in series. Series drive provides inherent current matching. LED ...