MX841

Features:

1.1V to 5.5V Input Range
2 Amp Peak Switch Current
High Efficiency  > 80%
20V Maximum Output with Over-Volta Protection 
LED Intensity Control
1.0 MHz Fixed Frequency Switching
8 Lead SOIC Package 


Application

White LED Display Backlighting
Low Voltage: Mobile Phones, PDA's, MP3 Players, Digital Cameras
High Drive Current: Vehicle instrumentation Panels


Specifications




Description

The MX841 is a fixed frequency, constant current source step-up DC/DC converter. The output current is directly regulated making the MX841 ideal for driving series connected white light emitting diodes (LED's) in  backlight applications. The MX841 powers up to 3 series white LED's at 1.1V, and 20 series/parallel white LED's at 5.0V. 
The MX841 features a 1.0MHz switching frequency to accommodate the use of small capacitors and a small inductor necessary in size sensitive portable applications. Light intensity and  shutdown  are conveniently controlled by asingle analog voltage. Power efficiency  and  battery life are extended through the  use of a high voltage, low RDSON N-
channel MOSFET switch.  
The MX841 is designed to operate over a temperature range  of -40°C to +85°C, and is available in an SOIC-8 Package, with or without an Exposed Pad in Tube  or on Tape and Reel. (Alternate package types available upon request).