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BCR401R
LED Driver Supplies stable bias current even at low battery voltage Low voltage drop of 0.75V Ideal for stabilizing bias current of LEDs Negative temperature coefficient protects LEDs against thermal overload
4 3

1
2
EHA07188
Type BCR401R
Marking W5s 1 = GND
Pin Configuration 2 = Iout 3 = VS 4 = Rext
Package SOT143R
Maximum Ratings Parameter Source voltage Output current Output voltage Reverse voltage between all terminals Total power dissipation, TS = 87 C Junction temperature Storage temperature Symbol VS Iout Vout VR Ptot Tj Tstg Value 18 60 16 0.5 330 150 -65 ... 150 mW C Unit V mA V
Thermal Resistance Parameter Junction - soldering point1) Symbol RthJS Value 190 Unit K/W
1For calculation of R thJA please refer to Application Note Thermal Resistance
1
Aug-29-2001
BCR401R
Electrical Characteristics at TA=25C, unless otherwise specified Parameter Characteristics Supply current
VS = 10 V IS Iout
Symbol min. 350 9
Values typ. 440 10 max. 540 11
Unit
A mA
Output current
VS = 10 V, Vout = 7.6 V
DC Characteristics with stabilized LED load Lowest sufficient battery voltage overhead Iout > 8mA Voltage drop (VS - VCE) Iout = 20 mA Output current change versus TA VS = 10 V Output current change versus VS VS = 10 V
VSmin Vdrop Iout/Iout Iout/Iout
-
1.2 0.75 -0.3 2
-
V
%/K %/V
2

Aug-29-2001
BCR401R
Total power dissipation Ptot = f(TS)
Output current versus supply voltage Iout = f (VS ); Rext = Parameter
Load: two LEDs with VF = 3.8V in series
500 10 -1
mW A
Rext = 36 Ohm Rext = 82 Ohm Rext = 160 Ohm Rext = open
P tot
300
Iout
10 -2 120 C 10 -3 0
200
100
0 0
20
40
60
80
100
150
2
4
6
8
10
12
14
16
V
20
TS
VS
Supply current versus supply voltage IS = f(VS )
Application Circuit:
+Vs BCR 401R 3
Load: two LEDs with VF = 3.8V in series
10 -3
R e x t V d ro p 4
A
IS
10 -4
1 2 Is Io u t
10 -5 0
2
4
6
8
10
12
14
16
V
20
VS
3
Aug-29-2001

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