CL2
Initial Release
Simple 90V 20mA Temperature Compensated
Constant Current LED Driver IC
Features
5.0V to 90V operating range (V
A-B
)
20mA ±10% at 5-90V
0.01% / °C Typical Temperature
Coefficient
TO-243AA (SOT-89), TO-252 (D-PAK),
& TO-92 packages
No external components (two terminal
device)
Can be paralleled for higher current
General Description
The Supertex CL2 is a high voltage, temperature
compensated, constant current source. The device is
trimmed to provide a constant current of 20mA±10%
at an input voltage of 5-90V. No external
components are required. The device can be used
as a two terminal constant current source or constant
current sink.
A typical application for the CL2 is to drive LEDs with
a constant current of 20mA. They can also be used
in parallel to provide higher currents such as 40mA,
60mA or 80mA. The device is available in SOT-89,
TO-252 (D-PAK), and TO-92 packages.
Applications
LED driver
Industrial lamp indicators
Signage
Accent lighting
Automotive
Constant current source
Constant current sink
Typical Application Circuit
Functional Circuit Diagram
V
A
V
A
CL2
Up to 90V
+ V
LED(total)
I
LED
<20mA
V
B
Control Circuit
and Temperature
Compensation
+
V
LED(total)
-
V
B
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CL2
Ordering Information
Order Number / Package
TO-92
CL2N3
TO-243AA*
CL2N8
TO-252
CL2K4
*Same as SOT-89 product supplied on 2000 piece tape reels.
Thermal Characteristics
Package
TO-92
TO-243AA (SOT-89)
TO-252 (D-PAK)
Power Dissipation
@
T
A
= 25°C
0.6W
1.3W*
2.0W*
θ
JC
°C/W
125
15
6.0
θ
JA
°C/W
170
78*
50*
* Mounted on FR4 board; 25mm x 25mm x 1.57mm.
Absolute Maximum Ratings*
V
A-B
, Operating Voltage
T
J
, Operating Junction Temperature
Ts, Storage Temperature
100V
-40°C to +125°C
-55°C to +150°C
*Absolute Maximum Ratings are those values beyond which damage to the device
may occur. Functional operation under these conditions is not implied. Continuous
operation of the device at the absolute rating level may affect device reliability.
Package Options
V
B
V
A
TO-25 2
(D-PAK)
NC
V
B
V
A
NC V
B
(TO-92 )
V
A
V
B
NC
TO-243A A
(SOT-89)
NC = No Connect
2
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CL2
Electrical Characteristics
(@ T
J
= 25°C unless otherwise specified)
Symbol
V
A-B
I
A-B
∆I
A-B
/∆T
T
J
R
A-B
Parameter
Maximum operating voltage
Current regulation
I
A-B
temperature coefficient
Operating junction temperature
Dynamic resistance
Min
18.0
Typ
20.0
0.01
-40
300k
125
Max
90
22.0
Units
V
mA
%/°C
°C
Ω
Conditions
V
A-B
= 5-90V
V
A-B
= 45V,
T
J
= -40°C to 100°C
Output Current vs. Voltage
25
20
15
10
5
0
0
10
20
30
40
50
V
A-B
3
60
70
80
90
100
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