3-CHANNEL CONSTANT CURRENT LED DRIVERS

DD231
Version
Issue Date
File Name
Total Pages
: A.003
: 2009/8/19
: SP-DD231-A.003.doc
:7
3-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.
Tel：886-3-5645656
Fax：886-3-5645626
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DD231
DD231
3-CHANNEL CONSTANT CURRENT LED DRIVERS
DESCRIPTION
The DD231 is a 3-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 DD231 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.
This configuration eliminates the need of external capacitors and inductances. With an input
voltage range of 3V to 5V, 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 3V to 5V.
․Bit-to-Bit : ± 3.0% (Max) @ IOUT = 5 ~ 30mA.
․Only Need One External Resistor, No Other External Parts.
․Small 6-Pin SOT26 Package.
APPLICATIONS
․White LED Display Backlighting
․Cellular Telephones
․Handheld Computers
․Digital Cameras
․Portable MP3 Players
․Pagers
․Personal Digital Assistant
․E-Books and Sub Notebooks
3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.003
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Page 1
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DD231
Pin Description
Out0
Out1
Out2
PIN NAME
VDD
Rext
GND
Out0 to Out2
Rext
GND
VDD
DESCRIPTION
Power supply terminal
Input terminal of an external resistor
Ground terminal
Output terminal
Maximum Ratings (Ta = 25°C, Tj(max) = 140°C)
CHARACTERISTIC
Supply Voltage
Output Current
Output Voltage
GND Terminal Current
SYMBOL
RATING
UNIT
VDD
IOUT
VOUT
IGND
V
mA
V
mA
°C
Power Dissipation
PD
Operating Temperature
Top
7
30
~17
90
0.35
-40 ~ 85
Storage Temperature
Tstg
-55 ~ 150
W
°C
Recommended Operating Condition
CHARACTERISTIC
Supply Voltage
Output Voltage
Output Current
Operating temperature
SYMBOL
VDD
VOUT
IO
TOPR
CONDITION
⎯
⎯
Outn
⎯
3-CHANNEL CONSTANT CURRENT LED DRIVERS
MIN.
2.7
0.2
5
-40
TYP.
3.3
0.6
⎯
⎯
Version: A.003
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Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
MAX.
6
5.0
30
85
UNIT
V
V
mA
°C
Page 2
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Electrical Characteristics
CHARACTERISTIC
(Typ:VDD = 3.3 V, Ta = 25°C unless otherwise noted)
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
⎯
±1.5
±3
%
⎯
±1.5
±3
26.3
29.2
32.1
VOUT = 1 V
IOL1
REXT = 12kΩ
Output Current (Bit-Bit)
VOUT = 0.5
IOL2
REXT = 60kΩ
IOL3
Output Current (Chip-Chip)
DD231
VOUT = 1.0V, REXT = 12kΩ
%
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.
3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.003
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
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Page 3
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DD231
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
TYPICAL APPLICATION
Rext
VDD
Out0
Rext
Out1
Out2
1
2
3
5
6
GND
4
VDD
Fig 3
3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.003
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
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Page 4
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DD231
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
Rext
5
GND
6
VDD
3-CHANNEL CONSTANT CURRENT LED DRIVERS
Center Coordinate (X,Y)
80.5
564.1
202.1
564.1
323.7
564.1
581.3
391.5
586.5
224.9
913.9
419.25
Version: A.003
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Page 5
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DD231
Package Outline (SOT26)
(6-pin SOT-26 )
C
E
H
L
e
θ1
D
A2
A
A1
b
SYMBOL
Dimensions in Millimeters
MIN
NOM
A
A1
1.00
0.00
1.10
－
MAX
1.30
0.10
A2
b
C
D
E
e
0.70
0.35
0.10
2.70
1.40
－
0.80
0.40
0.15
2.90
1.60
1.90(TYP)
0.90
0.50
0.25
3.10
1.90
－
H
L
2.60
0.37
2.80
－
3.00
－
θ1
1°
5°
9°
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.
3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.003
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 6