CAT3626_08 Datasheet, PDF (1/15 Pages) Catalyst Semiconductor – 6-Channel LED Driver with I2C™ Interface

CAT3626
6-Channel LED Driver with I²C™ Interface
FEATURES
„ Drives 6 LED channels
„ Independent current on 3 pairs of LEDs
„ I²C serial interface programming
„ Adjustable current to 32mA in 0.5mA step
„ 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
APPLICATIONS
„ RGB LEDs
„ LCD and keypad Backlighting
„ Cellular Phones, PDAs
„ Digital Cameras
ORDERING INFORMATION
PRODUCT DESCRIPTION
The CAT3626 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.
The LED channels are configured into three indepen-
dent pairs, each containing 2 matched channels. Each
pair can be separately programmed from zero to 32mA,
in 0.5mA resolution steps, using the I²C serial interface.
Any individual channel can be disabled while others
remain active. When the enable input (EN) is low, the
device is in shutdown mode drawing zero current.
The device is available in a 16-pad TQFN package
with a max height of 0.8mm.
Part Number Package
CAT3626HV4-T2 TQFN-16 ⁽¹⁾
CAT3626HV4-GT2 TQFN-16 ⁽²⁾
Quantity
per Reel
2000
2000
Notes: (1) Matte-Tin Plated Finish (RoHS-compliant)
(2) NiPdAu Plated Finish (RoHS-compliant)
Package
Marking
G626
CDAJ
For Ordering Information details, see page 14.
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
TQFN 16-pad 4 x 4mm
(Top View)
LEDA2 LEDB1 LEDB2 LEDC1
16 15 14 13
LEDA1 1
12 LEDC2
SDA 2
11 GND
SCL 3
10 C2+
EN 4
5
6
7
8
VOUT VIN C1- C1+
9 C2-
1µF
1µF
V_IN
3V to ^CIN
5.5V
1µF
ENABLE
I²C Interface
C1-
VIN
EN
SDA
SCL
C1+ C2- C2+
VOUT
CAT3626
LEDA1
LEDA2
LEDB1
LEDB2
LEDC1
GND
LEDC2
pair A
pair B
I²C is a trademark of Philips Corporation. Catalyst Semiconductor is licensed by Philips Corporation to carry the I²C bus protocol.
pair C
C_OUT
1µF
20mA
© Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice
Doc. No. MD-5014 Rev. D