FEATURES
?? Drives up to 4 LED channels
?? 1-wire EZDimTM Programmable LED Current
?? Accurate 1mA Dimming Level
?? Power efficiency up to 91%
?? Fractional pump 1x/1.5x
?? Low noise input ripple
?? Fixed High Frequency Operation 1MHz
?? “Zero” Current Shutdown Mode
?? Soft start and current limiting
?? Short circuit protection
?? Thermal shutdown protection
?? TDFN 12-pad 3mm x 3mm package
APPLICATIONS
?? LCD Display Backlight
?? Cellular Phones
?? Digital Still Cameras
?? Handheld Devices
DESCRIPTION
The CAT3614 is a high efficiency 1x/1.5x fractional charge pump with programmable dimming current in four LED channels. To ensure uniform brightness in LCD backlight applications, each LED channel delivers an accurate regulated current.
Low noise and input ripple is achieved by operating at a constant switching frequency of 1MHz which allows the use of small external ceramic capacitors.
The 1x/1.5x fractional charge pump supports a wide range of input voltages from 3V to 5.5V with efficiency up to 91%, and is ideal for Li-Ion battery powered devices.
The EN/DIM logic input provides a 1-wire EZDimTM interface for dimming control of the LEDs. When enabled, a series of clock pulses reduces the LED brightness in 1mA steps on each negative going edge. Currents from 0mA to 31mA are supported. The device is available in the tiny 12-pad TDFN 3 x 3mm package with a max height of 0.8mm.
Click to view :
CAT3614HV2-T2.pdf
