Description
The CAT37 is a DC/DC step up converter that delivers a regulated output current. Operation at a constant switching frequency of 1.2 MHz allows the device to be used with very small value external inductor and ceramic capacitors.

Features
• Low Quiescent Ground Current (0.5 mA Typical)
• Power Efficiency Over 80%
• Compatible Pinout with LT1937
• Adjustable Output Current (up to 40 mA)
• High Frequency 1.2 MHz Operation
• Input Voltage Operation down to 2.5 V
• Low Resistance (0.5 ) Power Switch
• Drives up to 4 White LEDs in Series
• Shutdown Current Less than 1 μA
• Load Fault Protection Against Open−circuits
• Low Value External Components
• Low Profile (1 mm) TSOT−23 5−lead Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant

Applications
• Color LCD and Keypad Backlighting
• Cellular Phones
• Handheld Terminals
• Digital Cameras
• PDAs/Games
• Portable MP3 Players