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Teilenummer | CAT3626 |
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Beschreibung | 6-Channel LED Driver | |
Hersteller | Catalyst Semiconductor | |
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Gesamt 14 Seiten www.DataSheet4U.com
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
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 www.DataSheet4U.com
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 | ||
Seiten | Gesamt 14 Seiten | |
PDF Download | [ CAT3626 Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
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