DESCRIPTION

The CAT37 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.

FEATURES

■ Low quiescent ground current (0.5mA typical)

■ Power efficiency over 80

■ Compatible pinout with LT1937

■ Adjustable output current (up to 40mA)

■ High frequency 1.2MHz operation

■ Input voltage operation down to 2.5V

■ Low resistance (0.5Ω) power switch

■ Drives up to 4 White LEDs in series

■ Shutdown current less than 1µA

■ Load fault protection against open-circuits

■ Low value external components

■ Low profile 5-lead SOT23 (1mm max) and TDFN (0.8mm) package

APPLICATIONS

■ Color LCD and keypad backlighting

■ Cellular phones

■ Handheld terminals

■ Digital cameras

■ PDAs/Games

■ Portable MP3 players