IK402U 02

TECHNICAL DATA
CONSTANT CURRENT LINEAR LED DRIVER
IK402U
DESCRIPTION
IK402U is a high-stable current source IC designed to
be used as a constant current LED driver. Application of a
constant current source provides continuous brightness of
LED light and long LED life time. Moreover, a constant
current source provides an over-temperature protection to
LED.
SOT-23-6
FEATURE
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High-stability output current
Low dropout voltage
Easy adjustable output current
Negative thermal coefficient of output current
Small overall dimensions, possible chip mount in
a single package with LED
Low cost, no external elements, simple use
LED drive current of 22 mA
Supply voltage up to 42 V
Easy paralleling of drivers to increase current
Low voltage overhead of 1.2 V
High current accuracy at supply voltage variation
No EMI
ESD Rating: Human Body Model 2000V
Reduced output current at higher temperatures –
negative thermal coefficient of - 0.1 %/K
APPLICATION
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Channel letters for advertising, LED strips for
decorative lighting
Aircraft, train, ship illumination
Retrofits for general lighting, white goods like
refrigerator lighting
Medical lighting
Automotive applications like CHMSL and rear
combination lights
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November 2015, Rev. 02
IK402U
MAXIMUM RATINGS
Parameter
Symbol
Value
Unit
Supply voltage
VS
42
V
Output voltage
VOUT
18.6
V
Reverse voltage between all terminals
VR
0.5
V
Junction Temperature
Tj
–40…+150
°C
Pmax= (VS – VOUT)  IOUT is determined by the condition Tj 150°C
ELECTRICAL CHARACTERISTICS ( Tj= +25°C, unless otherwise noted)
Parameter
Symbol
Collector-emitter
breakdown voltage
VBR(CEO)
Condition
Min
Typ
Max
Unit
IC = 1 mA, IB = 0
60
–
–
V
VS = 10 V
340
440
540
µA
Supply current
IS
Output current
IOUT
VS = 10 V, VOUT = 8.6 V
19
22
24
mA
Internal resistor
RINT
IRint = 20 mA
35
41
45
Ohm
Voltage drop (VS – VE)
Vdrop
IC = 20 mA
0.7
0.82
0.9
V
DC current gain
hFE
IC = 50 mA, VCE = 1 V
50
100
400
–
1.2
–
V
–
–0.1
–
%/C
–
1.0
–
%/V
DC Characteristics with stabilized LED load
Lowest sufficient battery
voltage overhead
VSmin
IOUT > 18mA
VS = 10 V,
Output current change
versus TA
IOUT/IOUT
Output current change
versus VS
IOUT/IOUT VS = 10 V
TA = (–45C…+85C)
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November 2015, Rev. 02
IK402U
SCHEMATIC DIAGRAM
VS
D1
Rint
D2
R
GND
Bottom side
IOUT
IK402U
APPLICATIONS INFORMATION
IK402
U
Vs
Rext
Gnd
Iout
Chip mounting
area
Typical Application
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November 2015, Rev. 02
IK402U
TYPICAL REFERENCE DIAGRAMS
Output Current vs. Supply Voltage
Current Consumption vs. Supply Voltage
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November 2015, Rev. 02
IK402U
Output Current vs. Ambient Temperature
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November 2015, Rev. 02
IK402U
Output Current vs. Rext Resistor
80
Io, Output Current (mA)
70
60
50
40
30
20
0
20
40
60
80
100
Rext Resistor (Ω)
120
140
160
140
160
Current consumption vs. Rext Resistor
1020
1000
Icc Current (mA)
980
960
940
920
900
880
860
0
20
40
60
80
100
120
Rext Resistor (Ω)
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November 2015, Rev. 02
IK402U
PACKAGE DIMENSION
SOT-23-6
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November 2015, Rev. 02