CAT3626 Datasheet, PDF (1/14 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
APPLICATION
„ RGB LEDs
„ LCD and keypad Backlighting
„ Cellular Phones, PDAs
„ Digital Cameras
ORDERING INFORMATION
Part Number
Package Quantity Package
per Reel Marking
CAT3626HS4-T2 Thin QFN-16 2000 C626
CAT3626HV4-T2 Thin QFN-16 2000
Green*
G626
Note *: Matte Tin Lead Finish
PIN CONFIGURATION
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
independent 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-lead thin QFN
package with a max height of 0.8mm.
TYPICAL APPLICATION CIRCUIT
QFN 16-lead 4x4mm
(Top View)
I²C is a trademark of Philips Electronics N.V.
© 2006 Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice
Doc. No. 3022 Rev. A