CAT3614
4-Channel 1-Wire LED Driver in 3 x 3mm Package
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
TDFN 12-pad 3mm x 3mm package
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
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.
TM
APPLICATIONS
LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
ORDERING INFORMATION
Part Number
Package
CAT3614HV2-T2 TDFN-12
(1)
CAT3614HV2-GT2 TDFN-12
(2)
Quantity
per Reel
2000
2000
Package
Marking
HAAA
HAAC
Notes:
(1) Matte-Tin Plated Finish (RoHS-compliant).
(2) NiPdAu Plated Finish (RoHS-compliant).
PIN CONFIGURATION
TDFN 12-Pad 3 x 3mm
(Top View)
VIN
C1+
C1-
C2-
C2+
GND
1
2
3
4
5
6
12 VOUT
11 EN/DIM
10 LED4
9 LED3
8 LED2
7 LED1
TYPICAL APPLICATION CIRCUIT
1µF
1µF
V
IN
3V to C
IN
5.5V
1µF
C1+
VIN
C1- C2+
C2-
VOUT
V
OUT
C
OUT
CAT3614
LED1
LED2
1µF
ENABLE/
DIMMING
20mA
EN/DIM
GND
LED3
LED4
Note:
Unused LED channels must be connected to VOUT.
©
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5035, Rev.B
CATALYST [ CATALYST SEMICONDUCTOR ]
