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CAT3626 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT3626
Beschreibung 6-Channel LED Driver
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 14 Seiten
CAT3626 Datasheet, Funktion
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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 G626
Green*
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.
Characteristics subject to change without notice
1
Doc. No. 3022 Rev. A






CAT3626 Datasheet, Funktion
www.DataSheet4U.com
CAT3626
TYPICAL CHARACTERISTICS
VIN = 3.6V, IOUT = 90mA (6 LEDs at 15mA), EN = VIN, CIN = C1 = C2 = COUT = 1µF, TAMB = 25ºC, unless
otherwise specified.
Power Up with 6 LEDs at 15mA (1x Mode)
Power Up with 6 LEDs at 15mA (1.5x Mode)
Enable Power Down (1x Mode)
Enable Power Down (1.5x Mode)
Switching Waveforms in 1.5x Mode
Operating Waveforms in 1x Mode
Doc. No. 5014 Rev. A
6 © 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

6 Page









CAT3626 pdf, datenblatt
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CAT3626
Write Instruction Example setting 20mA current in LEDB1 and LEDB2
I2C Bus Protocol
TYPICAL APPLICATION
The CAT3626 is ideal for driving RGB (red green blue)
LEDs with common anode configuration. The
individual LED currents associated with the red, green
and blue LEDs are programmable independently
through the I2C interface, allowing to generate an
accurate color mixing. Dimming while maintaining the
same color can be done by reprogramming the RegEn
register on and off with the appropriate duty cycle
(PWM mode).
RGB LED
Doc. No. 5014 Rev. A
12 © 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

12 Page





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