4-CHANNEL CONSTANT CURRENT LED DRIVERS

DD233
Version
Issue Date
File Name
Total Pages
: A.011
: 2006/6/23
: SP-DD233-A.011.doc
: 10
4-CHANNEL CONSTANT CURRENT LED DRIVERS
新竹市科學園區展業一路 9 號 7 樓之 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park,
Hsin-Chu, Taiwan 300, R.O.C.
Fax:886-3-5645626
Tel:886-3-5645656
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
DD233
4-CHANNEL CONSTANT CURRENT LED DRIVERS
DESCRIPTION
The DD233 is a 4-channel constant current LED driver. It’s designed to operate as a
constant-current sink to drive the LEDs with an external resistance in low power environment.
Because the DD233 directly determines output current by each channel in low Bit-to-Bit skew, it is
ideal for driving LED whose light intensity is proportional to the current passing through them, not
the voltage across their terminals. The ENABLE provides the low power stand by function for
mobile applications.
This configuration eliminates the need of external capacitors and inductances. With an input
voltage range of 2.7V to 6V, so the device can work in general battery system. The value of constant
current can be varied using an external resistor (Iout = 5 ~30mA).
GENERAL FEATURES
․Constant Current Output, 5~30mA.
․Supply Voltage VDD is 2.7V to 6V.
․Bit-to-Bit : ± 3.0% (Max) @ IOUT = 5 ~ 30mA.
․Only Need One External Resistor, No Other External Parts.
․8-Pin SOP8 or MSOP8 Package.
APPLICATIONS
․Digital Cameras
․Portable MP3 Players
․White LED Display Backlighting
․Cellular Telephones
․Handheld Computers
․Pagers
․Personal Digital Assistant
․E-Books and Sub Notebooks
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.011
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Page 1
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
Pin Description
PIN NAME
VDD
Rext
GND
ENABLE
Out0 to Out3
OUT3
VDD
OUT2
ENABLE
OUT1
VSS
OUT0
REXT
DESCRIPTION
Power supply terminal
Input terminal of an external resistor
Ground terminal
Output enable terminal
Output terminal
Maximum Ratings (Ta = 25°C, Tj(max) = 150°C)
CHARACTERISTIC
Supply Voltage
Output Current
Output Voltage
GND Terminal Current
SYMBOL
RATING
UNIT
VDD
IOUT
VOUT
IGND
V
mA
V
mA
Power Dissipation
PD
-0.5~7
30
~17
120
0.44
Operating Temperature
Top
-40 ~ 85
°C
Storage Temperature
Tstg
-55 ~ 150
°C
W
Recommended Operating Condition
CHARACTERISTIC
Supply Voltage
Output Voltage
Output Current
Operating temperature
SYMBOL
VDD
VOUT
IO
TOPR
CONDITION
⎯
⎯
Outn
⎯
4-CHANNEL CONSTANT CURRENT LED DRIVERS
MIN.
2.7
0.2
5
-40
TYP.
3.3
0.6
⎯
⎯
Version:A.011
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MAX.
6
5.0
30
85
Page 2
UNIT
V
V
mA
°C
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
Electrical Characteristics
CHARACTERISTIC
(Typ:VDD = 3.3 V, Ta = 25°C unless otherwise noted)
SYMBOL
MIN.
TYP.
MAX.
UNIT
⎯
±1.5
±3
%
⎯
±1.5
±3
VOUT = 1 V
IOL1
REXT = 12kΩ
Output Current (Bit-Bit)
VOUT = 0.5
IOL2
Output Current (Chip-Chip)
CONDITION
REXT = 60kΩ
%
IOL3
VOUT = 1.0V, REXT = 12kΩ
26.3
29.2
32.1
mA
IOL4
VOUT = 0.5V, REXT = 60kΩ
4.8
5.31
5.8
mA
Detailed Description
1) Constant Current Output Value Setting
The output current is determined by the resistance connected between REXT pin and GND. The
approximate relation between the resistance value and the base current value is shown in Fig1,
the approximate equation presented in (Eq.1).
Iout-Rext
35.00
30.00
Iout0 (mA)
25.00
20.00
15.00
10.00
5.00
0.00
0
10
20
30
40
50
60
70
80
Rext (kΩ)
Fig 1
Iout ≅ 350.4/Rext
(Eq.1)
2) Constant Current Output Value and Output Voltage
In order to obtain a good constant current output, a suitable output voltage is necessary. Users
can get related information about the minimum output voltage from Fig 2.
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.011
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Page 3
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
35.00
30.00
Iout0 (mA)
25.00
20.00
15.00
10.00
5.00
0.00
0
1
2
3
4
5
6
Vout (V)
Fig 2
3) Power Dissipation
The recommended power dissipation versus temperature is depicted as follows:
SOP8 Power Dissipation-Temperature
600
Power Dissipation ( mW )
550
500
450
400
350
300
250
200
150
100
50
0
0
25
50
75
100
125
Ambient Temperature ( ℃ )
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.011
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Page 4
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
TYPICAL APPLICATION
VDD
8
VDD
OUT31
7 ENABLE
ENABLE
OUT22
5 REXT
OUT13
OUT04
VSS
6
Rext
Fig 3
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.011
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Page 5
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
DIE CONFIGURATION (UNIT: μM)
Die Size: 984.3X643.8
Die Thickness: 300
Pad Size: 80X80
Pin NO. PAD Name
1
Out0
2
Out1
3
Out2
4
Out2
5
Rext
6
GND
7
EN
8
VDD
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Center Coordinate (X,Y)
80.5
564.1
202.1
564.1
323.7
564.1
445.3
564.1
581.3
391.85
586.5
224.9
724.1
70.8
913.9
419.25
Version:A.011
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Page 6
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
Package Specification (SOP8)
( 8-pin SOP )
E
H
h x 45°
D
A
C
A1
B
θ
e
L
Seating Plane
0
5
0.0
Dimension in mm
Symbol
MIN.
MAX.
0.2
mm
0.4
Dimension in inch
MIN.
A
1.35
1.75
0.0532
0.0688
0.10
0.25
0.0040
0.0098
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.0075
0.0098
1.27BSC
inch
NOTE
MAX.
A1
e
10
0.050BSC
D
4.80
5.00
0.189
0.197
H
5.80
6.20
0.2284
0.2440
E
3.80
4.00
0.1497
0.1574
L
0.40
1.27
0.016
0.050
h
0.25
0.50
0.0099
0.0196
θ
0°
8°
0°
8°
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.011
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Page 7
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
Package Specification (MSOP8)
(8-pin MSOP )
E1
E
C
θ
L
D
12°(4X)
A2
A
A1
y
b
e
Dimensions in Millimeter
Dimensions in Inches
SYMBOL
MIN
NOM
MAX
MIN
NOM
MAX
A
A1
A2
b
C
D
E
E1
e
L
Y
0.81
0.00
0.76
0.15
0.13
2.90
4.80
2.90
-
0.92
-
0.032
0.000
0.030
0.006
0.005
0.114
0.189
0.114
-
0.036
-
0.66
0.10
0.016
-
0.034
0.008
0.006
0.118
0.193
0.118
0.026
0.021
-
0.042
0.004
0.038
0.012
0.009
0.122
0.197
0.122
-
0.40
-
0.86
0.20
0.15
3.00
4.90
3.00
0.65
0.53
-
1.07
0.10
0.97
0.30
0.23
3.10
5.00
3.10
-
θ
0°
-
6°
0°
-
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.011
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0.026
0.004
6°
Page 8
點晶科技股份有限公司
DD233
SILICON TOUCH TECHNOLOGY INC.
The products listed herein are designed for ordinary electronic applications, such as
electrical appliances, audio-visual equipment, communications devices and so on. Hence,
it is advisable that the devices should not be used in medical instruments, surgical
implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention
equipment and the like. Misusing those products may directly or indirectly endanger
human life, or cause injury and property loss.
Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage
of the products mentioned above. Anyone who purchases any products described herein
with the above-mentioned intention or with such misused applications should accept full
responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all
their officers and employees shall defend jointly and severally against any and all claims
and litigation and all damages, cost and expenses associated with such intention and
manipulation.
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.011
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Page 9