CAT3626HV4-T2 [CATALYST]
6-Channel LED Driver with I2C Interface; 6通道LED驱动器，带有I2C接口
| 型号： | CAT3626HV4-T2 |
| 厂家： | 
CATALYST SEMICONDUCTOR |
| 描述： | 6-Channel LED Driver with I2C Interface |
| 文件： | 总14页 (文件大小：807K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT3626
6-Channel LED Driver with I2C Interface
FEATURES
PRODUCT DESCRIPTION
Drives 6 LED channels
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.
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
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.
Fixed High Frequency Operation 1MHz
“Zero” Current Shutdown Mode
Soft start and current limiting
Short circuit protection
Thermal shutdown protection
APPLICATION
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.
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
CAT3626HV4-T2 Thin QFN-16 2000
C626
G626
The device is available in a 16-lead thin QFN
package with a max height of 0.8mm.
Green*
Note *: Matte Tin Lead Finish
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
QFN 16-lead 4x4mm
I2C is a trademark of Philips Electronics N.V.
© 2006 Catalyst Semiconductor, Inc.
1
Doc. No. 3022 Rev. A
Characteristics subject to change without notice
CAT3626
ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LEDxx voltage
Rating
6
Unit
V
VOUT, C1±, C2± voltage
EN, SDA, SCL voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
7
V
V
ºC
ºC
ºC
VIN + 0.7V
-65 to +160
-40 to +125
300
RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Range
3 to 5.5
Unit
V
Ambient Temperature Range
LED forward voltage
ILED per LED pin
-40 to +85
Up to 4.2
0 to 32
ºC
V
mA
Typical application circuit with external components are shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V, EN = High, ambient temperature of 25ºC (over recommended operating conditions unless specified
otherwise)
Symbol Parameter
Conditions
Min
Typ
Max
Unit
mA
mA
mA
µA
mA
%
1x mode, all LEDs Off
1x mode, all LEDs On
1.5x mode, all LEDs Off
0.5
2.2
3.5
IQ
Quiescent Current
IQSHDN
ILED
Shutdown Current
LED Current Range with 6 LEDs
VEN = 0V
0
1
32
0
ILED-ACC LED Current Accuracy
ILED-DEV LED Channel Matching
1mA ≤ ILED ≤ 31mA
(ILED - ILEDAVG) / ILEDAVG
±3
±3
%
Ω
Ω
1x mode, IOUT = 120mA
0.5
ROUT
Output Resistance (open loop)
1.5x mode, IOUT = 120mA
2.8
FOSC
ISC_MAX
IIN_MAX
Charge Pump Frequency
Output short circuit Current Limit VOUT < 0.5V
Input Current Limit
0.8
1
60
300
1.3
MHz
mA
mA
1x mode, VOUT > 1V
EN Pin
IEN
- Input Leakage
- Logic High Level
- Logic Low Level
1
µA
V
-1
VHI
VLO
1.3
0.4
V
TSD
THYS
Thermal Shutdown
Thermal Hysteresis
165
20
ºC
ºC
Undervoltage lock out (UVLO)
VUVLO
2
V
threshold
Doc. No. 5014 Rev. A
2
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3626
A.C. CHARACTERISTICS
For 3V ≤ VIN ≤ 5.5V, over full ambient temperature range -40 to +125°C (over recommended operating conditions
unless specified otherwise).
Symbol Parameter
Min
Typ
Max
400
0.9
Unit
kHz
µs
µs
µs
µs
µs
µs
ns
fSCL
Clock Frequency
tAA
tBUF
SCL Low to SDA Data Out and ACK Out
Bus Free Time Before a New Transmission Can Start
Start Condition Hold Time
Clock Low Period
Clock High Period
Start Condition Setup Time (For a Repeated Condition)
Data In Hold Time
Data In Setup Time
1.2
0.6
1.2
0.6
0.6
0
tHD:STA
tLOW
tHIGH
tSU:STA
tHD:DAT
tSU:DAT
tR
100
ns
µs
ns
SDA and SCL Rise Time
0.3
300
tF
SDA and SCL Fall Time
tSU:STO
tDH
Stop Condition Setup Time
Data Out Hold Time
0.6
50
µs
ns
Figure 1. I2C Bus Timing Characteristics
© 2006 Catalyst Semiconductor, Inc.
3
Doc. No. 5014 Rev. A
Characteristics subject to change without notice
CAT3626
TYPICAL CHARACTERISTICS
VIN = 3.6V, IOUT = 90mA (6 LEDs at 15mA), EN = VIN, CIN = C1 = C2 = COUT = 1µF, TAMB = 25ºC, unless
otherwise specified.
Efficiency vs. Input Voltage (6 LEDs)
Efficiency vs. Total LED Current (6 LEDs)
100
100
1x Mode
15mA per LED
VIN = 4V (1x mode)
90
80
70
60
50
40
90
80
70
60
50
40
1.5x Mode
VIN = 3.2V (1.5x mode)
20mA per LED
4.2 4.0 3.8 3.6 3.4 3.2 3.0
INPUT VOLTAGE [V]
0
50
100
150
200
TOTAL LED CURRENT [mA]
Quiescent Current vs. Input Voltage (1x Mode)
Quiescent Current vs. Temperature (1x Mode)
0.8
0.8
0.6
0.6
0.4
0.4
6 LEDs OFF
0.2
0
0.2
6 LEDs OFF
0.0
3.0 3.2 3.4 3.6 3.8 4.0 4.2
INPUT VOLTAGE [V]
-40
0
40
80
120
TEMPERATURE [°C]
Quiescent Current vs. Input Voltage (1.5x Mode)
Quiescent Current vs. Temperature (1.5x Mode)
5
5
4
3
2
4
3
2
1
6 LEDs OFF
1
6 LEDs OFF
0
0
3.0 3.2 3.4 3.6 3.8 4.0 4.2
INPUT VOLTAGE [V]
-40
0
40
80
120
TEMPERATURE [°C]
Doc. No. 5014 Rev. A
4
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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
LED Current Change vs. Temperature
5.0
4.0
3.0
5.0
4.0
3.0
2.0
1.0
2.0
1.0
1x Mode
0.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-1.0
-2.0
-3.0
-4.0
-5.0
1.5x Mode
3.0 3.2 3.4 3.6 3.8 4.0 4.2
INPUT VOLTAGE [V]
-40 -20
0
20 40 60 80
TEMPERATURE [°C]
Oscillator Frequency vs. Input Voltage
Oscillator Frequency vs. Temperature
1.3
1.3
1.2
1.1
1.0
0.9
0.8
0.7
1.2
1.1
1.0
0.9
0.8
0.7
3.0
3.2
3.4
3.6
3.8
4.0
-40
0
40
80
120
INPUT VOLTAGE [V]
TEMPERATURE [°C]
Output Resistance vs. Input Voltage (1x Mode)
Output Resistance vs. Input Voltage(1.5x Mode)
1.0
4.0
3.5
3.0
2.5
2.0
1.5
0.8
0.6
0.4
0.2
0.0
1.0
3.0 3.2 3.4 3.6 3.8 4.0 4.2
INPUT VOLTAGE [V]
3.0 3.2 3.4 3.6 3.8 4.0 4.2
INPUT VOLTAGE [V]
© 2006 Catalyst Semiconductor, Inc.
5
Doc. No. 5014 Rev. A
Characteristics subject to change without notice
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
CAT3626
TYPICAL CHARACTERISTICS
VIN = 3.6V, IOUT = 90mA (6 LEDs at 15mA), EN = VIN, CIN = C1 = C2 = COUT = 1µF, TAMB = 25ºC, unless
otherwise specified.
Line Transient Response in 1x mode
Foldback Current Limit
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1x Mode
0
100
200
300
400
OUTPUT CURRENT [mA]
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. 5014 Rev. A
CAT3626
PIN DESCRIPTIONS
Pin # Name
Function
1
2
LEDA1
SDA
SCL
Cathode terminal of LED A1
I2C Serial data input/output
I2C Serial clock input
3
4
5
6
EN
VOUT
VIN
Enable input
Charge pump output connected to the LED anodes
Supply voltage
7
8
9
10
11
12
13
14
15
16
C1-
C1+
C2-
C2+
GND
LEDC2
LEDC1
LEDB2
LEDB1
LEDA2
TAB
Bucket capacitor 1 terminal
Bucket capacitor 1 terminal
Bucket capacitor 2 terminal
Bucket capacitor 2 terminal
Ground reference
Cathode terminal of LED C2
Cathode terminal of LED C1
Cathode terminal of LED B2
Cathode terminal of LED B1
Cathode terminal of LED A2
Connect to Ground on PCB
PIN FUNCTION
VIN is the supply pin for the charge pump. A small
1µF ceramic bypass capacitor is required between the
VIN pin and ground near the device. The operating
input voltage range is from 2.2V to 5.5V. Whenever
the input supply falls below the undervoltage threshold
(2V), all LEDs channels will be automatically disabled.
GND is the ground reference for the charge pump.
The pin must be connected to the ground plane on the
PCB.
C1+, C1- are connected to each side of the 1µF
ceramic bucket capacitor C1.
EN is the enable logic input for the driver. Guaranteed
levels of logic high and logic low are set at 1.3V and
0.4V respectively. When EN is initially taken high, the
device becomes enabled and all LED currents remain
at 0mA. To place the device into zero current
shutdown mode, the EN pin must be held low.
C2+, C2- are connected to each side of the 1µF
ceramic bucket capacitor C2.
LEDxx provide the internally regulated current to the
six LED cathodes. These pins enter a high-impedance
zero-current state whenever the device is placed in
shutdown mode. In applications using less than six
LEDs, the unused channels should be disabled
through the RegEn register.
SDA is the I2C serial data line. This is a bidirectional
line allowing data to be written into and read from the
four registers in the driver. Registers RegA/B/C set the
LED current in each pair of channels, while RegEn
sets the On/Off state independently of each channel.
TAB is the exposed pad underneath the package. For
best thermal performance, the tab should be soldered
to the PCB and connected to the ground plane.
SCL is the I2C serial clock input.
VOUT is the charge pump output that is connected to
the LED anodes. A small 1µF ceramic bypass
capacitor is required between the VOUT pin and
ground near the device.
Doc. No. 5014 Rev. A
8
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3626
BLOCK DIAGRAM
Figure 2. CAT3626 Functional Block Diagram
BASIC OPERATION
LED CURRENT SETTING
The LED current setting is programmed via the I2C
serial interface and is stored in four
At power-up, the CAT3626 starts operating in 1x
mode where the output will be approximately equal to
the input supply voltage (less any internal voltage
losses). If the output voltage is sufficient to regulate all
LEDs currents the device remains in 1x operating
mode.
8-bit registers RegA, RegB, RegC and RegEn as
follows:
RegA stores the LED current for group A
(LEDA1 and LEDA2 channels),
If the input voltage is insufficient or falls to a level
where the regulated currents cannot be maintained,
the device automatically switches (after a fixed time of
400µs) into 1.5x mode.
RegB stores the LED current for group B
(LEDB1 and LEDB2 channels),
RegC stores the LED current for group C
(LEDC1 and LEDC2 channels),
In 1.5x mode, the output is approximately equal to 1.5
times the input supply voltage (less any internal
voltage losses).
RegEn selects the on/off state of each of the
6 LED channels.
At each write access to RegEn, the driver
automatically reconfigures to the mode (1x or 1.5x)
that provides the highest efficiency.
The above sequence is repeated each and every time
the chip is either powered-up or taken out of shutdown
(via EN pin), or the RegEn register is accessed by
write cycle.
© 2006 Catalyst Semiconductor, Inc.
9
Doc. No. 5014 Rev. A
Characteristics subject to change without notice
CAT3626
Table 1. Register address and data configuration
Bit pattern
Bit 3
Register Register
name
Address
Bit 7
X
X
Bit 6
X
X
Bit 5
Bit 4
Bit 2
Bit 1
Bit 0
RegA
RegB
RegC
0
1
2
See Table 2 for values
X
X
LEDC2
LEDC1
LEDB2
LEDB1
LEDA2
LEDA1
RegEn
3
X
X
On = 1
Off = 0
On = 1
Off = 0
On = 1
Off = 0
On = 1
Off = 0
On = 1
Off = 0
On = 1
Off = 0
Notes:
X = not used
1 = logic high
0 = logic low
The table 2 lists the various LED currents with the associated RegA, RegB, and RegC register values
Table 2. LED Current Selection and Register Value
LED
current
(mA)
LED
current
(mA)
D7 D6
D5 D4 D3 D2 D1 D0
Dec
D7 D6 D5 D4 D3 D2
D1 D0 Dec
0.5
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
24.0
24.5
25.0
25.5
26.0
26.5
27.0
27.5
28.0
28.5
29.0
29.5
30.0
30.5
31.0
31.5
32.0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
1.0
1
1.5
2
2.0
3
2.5
4
3.0
5
3.5
6
4.0
7
4.5
8
5.0
9
5.5
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
16.0
Notes: X = not used
Doc. No. 5014 Rev. A
10
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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
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.
Read operation:
S
Slave address
W
A
Register address
A
A
S
Slave address
R
A
Data
A*
P
Write operation:
S
Slave address
W
A
Register address
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
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
CAT3626
PACKAGE DRAWING AND DIMENSIONS
Thin QFN 16-Lead 4mm x 4m
© 2006 Catalyst Semiconductor, Inc.
13
Doc. No. 5014 Rev. A
Characteristics subject to change without notice
REVISION HISTORY
Date
Rev.
Reason
03/20/2006
A
Initial Issue
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applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal
injury or death may occur.
Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled
"Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale.
Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical
semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc.
Corporate Headquarters
1250 Borregas Avenue
Sunnyvale, CA 94089
Phone: 408.542.1000
Fax: 408.542.1200
www.catsemi.com
Document No: 5014
Revision:
A
Issue date:
03/20/2006
相关型号：
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