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PDF CAT3626 Data sheet ( Hoja de datos )
| Número de pieza | CAT3626 | |
| Descripción | 6-Channel LED Driver | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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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
1 page  
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.
LED Current Change vs. Input Voltage
5.0
4.0
3.0
2.0 1x Mode
1.0
0.0
-1.0
-2.0 1.5x Mode
-3.0
-4.0
-5.0
3.0 3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
LED Current Change vs. Temperature
5.0
4.0
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-40
-20 0 20 40 60
TEMPERATURE [°C]
80
Oscillator Frequency vs. Input Voltage
1.3
1.2
1.1
1.0
0.9
0.8
0.7
3.0
3.2 3.4 3.6 3.8
INPUT VOLTAGE [V]
4.0
Oscillator Frequency vs. Temperature
1.3
1.2
1.1
1.0
0.9
0.8
0.7
-40
0 40 80
TEMPERATURE [°C]
120
Output Resistance vs. Input Voltage (1x Mode)
1.0
0.8
0.6
0.4
0.2
0.0
3.0 3.2 3.4 3.6 3.8 4.0 4.2
INPUT VOLTAGE [V]
Output Resistance vs. Input Voltage(1.5x Mode)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 5014 Rev. A
5 Page 
www.DataSheet4U.com
CAT3626
I2C INTERFACE
The LED driver is interfaced through a 2-wire serial
I2C-bus in order to control the state and the current in
each of the six LED channels. The SDA and SCL lines
comply with the I2C electrical specification and should
be terminated with pull-up resistors. When the bus is
not used, both lines are high. The device supports the
maximum bus speed of 400 kbit/s. The serial bit
sequence is shown below for read and write
operations into the registers. Read and write
Read operation:
S Slave address W A Register address
Write operation:
S Slave address W A Register address
instructions are initiated by the master controller/CPU
and acknowledged by the slave LED driver. The I2C
address of the driver is internally fixed to the binary
value 1100110. The protocol requires that the start bit
and the device address are both repeated. For further
details on the I2C protocol, please refer to the I2C-Bus
Specification, document number 9398 393 40011,
from Philips Semiconductors.
A S Slave address R A Data A* P
A Data A P
S: Start condition
R, W: Read bit (1), Write bit (0)
A: Acknowledge sent by the slave LED driver (SDA high)
A*: Not Acknowledge sent by the master microcontroller (SDA low)
P: Stop condition
Slave address: Device address 7 bits (MSB first, slave address is 1100110).
Register address: Device register address 8 bits
Data: Data to read or write 8 bits
Write Instruction Sequence
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 5014 Rev. A
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CAT3626.PDF ] | |
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