CAT3614HV2-T2 Datasheet, PDF (1/13 Pages) ON Semiconductor – 4-Channel 1-Wire LED Driver in 3 x 3mm Package

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
APPLICATIONS
„ LCD Display Backlight
„ Cellular Phones
„ Digital Still Cameras
„ Handheld Devices
ORDERING INFORMATION
Part Number
CAT3614HV2-T2
CAT3614HV2-GT2
Package
TDFN-12 ⁽¹⁾
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 1
C1+ 2
C1- 3
C2- 4
C2+ 5
GND 6
12 VOUT
11 EN/DIM
10 LED4
9 LED3
8 LED2
7 LED1
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-pad TDFN
3 x 3mm package with a max height of 0.8mm.
For Ordering Information details, see page 12.
TYPICAL APPLICATION CIRCUIT
1µF
1µF
V_IN
3V to ^CIN
5.5V
1µF
ENABLE/
DIMMING
C1+
VIN
C1- C2+ C2-
VOUT
CAT3614
EN/DIM
GND
LED1
LED2
LED3
LED4
V_OUT
C_OUT
1µF
20mA
Note: Unused LED channels must be connected to VOUT.
© 2008 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-5035, Rev.C