CL2
Simple 90V, 20mA, Temperature Compensated,
Constant-Current LED Driver IC
Features
•
•
•
•
5.0 to 90V operating range (V
A-B
)
20 mA ±10% at 5.0 - 90V
0.01%/°C typical temperature coefficient
Available in TO-243AA (SOT-89), TO-252(D-
PAK), & TO-92 packages
• Can be paralleled for higher current
Description
CL2 is a high voltage, temperature compensated, con-
stant-current source. The device is trimmed to provide
a constant current of 20 mA ±10% at an input voltage
of 5–90V. 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 20 mA. Multiple CL2s can also be
used in parallel to provide higher currents such as
40 mA, 60 mA or 80 mA. The device is available in TO-
243AA (SOT-89), TO-252 (D-PAK), and TO-92 pack-
ages.
Applications
•
•
•
•
•
•
•
LED driver
Industrial lamp indicators
Signage
Accent lighting
Automotive
Constant current source
Constant current sink
Package Type
VB
VB
VB
VA
N/C
NC
VA
VA
VB
N/C
TO-92
See
Table 2-1
for pin information
TO-252 (D-PAK)
TO-243AA (SOT-89)
2015 Microchip Technology Inc.
DS20005448A-page 1
CL2
Typical Application Circuit
VA
Functional Circuit
Diagram
VA
CL2
Up to 90V
+ V
LED(total)
100nF
VB
+
I
LED
<20mA
Control Circuit
and Temperature
Compensation
V
LED(total)
VB
-
DS20005448A-page 2
2015 Microchip Technology Inc.
CL2
1.0
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
†
Operating voltage, V
A-B
........................................................................................................................................... 100V
Operating junction temperature, T
j
........................................................................................................... -40 to +125 °C
Storage Temperature, T
s
.......................................................................................................................... -55 to +150 °C
† Notice:
Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods
may affect device reliability.
DC AND AC CHARACTERISTICS
Electrical Specifications:
Unless otherwise specified, for all specifications T
A
= +25°C
Parameter
Operating voltage
Current regulation
I
A-B
temperature coefficient
Operating junction temperature
Dynamic resistance
Symbol
V
A-B
I
A-B
∆I
A-B
/∆T
T
j
R
A-B
Min
5.0
18.0
-
-40
-
Typ
-
20
0.01
-
300
Max
90
22
-
125
-
Units Conditions
V
mA
%/°C
°C
kΩ
---
V
A-B
= 5.0V - 90V
V
A-B
= 45V, T
j
= -40°C to +100°C
---
---
TEMPERATURE SPECIFICATIONS
Parameter
Temperature Ranges
Operating Junction Temperature
Storage Temperature
Package Thermal Resistances
Thermal Resistance, TO-92
Thermal Resistance, TO-252
Thermal Resistance, TO-243AA
θ
ja
θ
ja
θ
ja
–
–
–
132
81
133
–
–
–
°C/W
°C/W
Note 1
°C/W
Note 1
T
j
T
s
-40
-55
–
–
125
150
°C
°C
Symbol
Min
Typ
Max
Units Conditions
Note 1:
Mounted on FR4 board, 25mm x 25mm x 1.57 mm
TABLE 1-1:
THERMAL CHARACTERISTICS
Package
TO-92
TO-252
TO-243AA
Power Dissipation
@T
A
= 2.5°C (W)
0.6
2.0
1.3
Note 1
Note 1
Conditions
Note 1:
Mounted on FR4 board, 25mm x 25mm x 1.57 mm
2015 Microchip Technology Inc.
DS20005448A-page 3
CL2
2.0
PIN DESCRIPTION
The locations of the pins are listed in
Package Type
and
Packaging Information.
TABLE 2-1:
Pin # TO-92
1
2
3
PIN DESCRIPTION
Pin # TO-252
1
3
4
Pin # To-243AA
1
3
2,4
Symbol
VA
NC
VB
Function
Current in
No connect
Current out
DS20005448A-page 4
2015 Microchip Technology Inc.
CL2
3.0
FUNCTIONAL DESCRIPTION
Figure 3-1
provides the Functional Circuit diagram and
its equivalent block diagram for CL2. Performance
information is available in
Figure 3-2
and
Figure 3-3.
Figure 3-4
and
Figure 3-5
provide example schemat-
ics.
VA
VA
Control Circuit
and Temperature
Compensation
VB
VB
20mA
±10%
Functional Circuit Diagram
Equivalent Block Diagram
FIGURE 3-1:
1.03
Functional Circuit Diagram and Equivalent Block Diagram
Current, normalized to 25°C
1.02
5.0V
1.01
45V
90V
1.00
0.99
0.98
-55
-35
-15
5
25
45
65
85
105
125
145
Temperature (°C)
FIGURE 3-2:
Temperature Characteristics
2015 Microchip Technology Inc.
DS20005448A-page 5
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