FEATURES
?? 6 LED channels with tight matching
?? Independent Main and Sub 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
?? RoHS-compliant 16-pad TQFN 4mm x 4mm package
APPLICATION
?? Main and sub-display backlight
?? Color LCD and keypad Backlighting
?? Cellular Phones
?? Handheld Devices
?? Digital Cameras
DESCRIPTION
The CAT3616 is a high efficiency 1x/1.5x fractional charge pump with programmable dimming current in six 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.
Two groups of LEDs, main (MAIN1 to MAIN4) and sub (SUB1 and SUB2) are programmable through the E¯N¯M¯ (active low) and E¯N¯¯S inputs. Independent current from 1mA to 31mA with a 1mA step are set by toggling the E¯N¯M¯ and E¯N¯¯S inputs. The enable EN input pin allows to shutdown the device with zero quiescent current.
The device is available in a 16-pad TQFN package with a max height of 0.8mm.
Click to view :
CAT3616HV4-GT2.pdf
