CAT3614 Datasheet, PDF (1/12 Pages) Catalyst Semiconductor – 4-Channel 1-Wire LED Driver in 3x3mm Package

4-Channel 1-Wire LED Driver in
3x3mm Package
CAT3614
FEATURES
„ Drives up to 4 LED channels
„ 1-wire EZDim^TM 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
„ 12-lead TDFN 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 EZDim^TM
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-lead thin DFN
3mm x 3mm package with a max height of 0.8mm.
ORDERING INFORMATION
Part Number
CAT3614HS2-T2
CAT3614HV2-T2
Package
TDFN-12 3x3
TDFN-12 3x3 Green
Quantity
per Reel
2000
2000
Package
Marking
HAAB
HAAA
Pin Configuration
Top View
Typical Application Circuit
12-lead TDFN 3mm x 3mm
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Note: Unused LED channels must be connected to
VOUT.
1
Doc. No. 25095, Rev. 01