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High-Efficiency, White LED Step-Up Converter
with I 2 C Interface in 2mm x 2mm WLP
Typical Operating Characteristics
(V IN = 3.6V, V DD = 1.8V, C IN = 1μF, C OUT = 1μF, C VDD = 0.1μF, C COMP = 0.22μF, L = TOKO 1098AS-100M, I LED1 = I LED2 = 25.25mA,
I LED3 = I LED4 = I LED5 = 5mA, unless otherwise noted.)
100
95
90
85
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED1 STRING)
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED1 AND LED2 STRINGS)
100
95
90
85
80
85
80
75
70
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED3 STRING)
80
75
4 LEDs: V OUT = 13.35V
5 LEDs: V OUT = 16.63V
6 LEDs: V OUT = 19.83V
7 LEDs: V OUT = 23.07V
8 LEDs: V OUT = 26.23V
75
70
65
4 LEDs: V OUT = 13.37V
5 LEDs: V OUT = 16.61V
6 LEDs: V OUT = 19.78V
7 LEDs: V OUT = 23.02V
8 LEDs: V OUT = 26.17V
65
60
55
5 LEDs: V OUT = 15.04V
6 LEDs: V OUT = 17.97V
7 LEDs: V OUT = 20.97V
8 LEDs: V OUT = 23.97V
9 LEDs: V OUT = 26.81V
70
60
50
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED3-TO-LED5 STRINGS)
INPUT VOLTAGE (V)
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED1–LED5 STRINGS)
INPUT VOLTAGE (V)
CONVERTER EFFICIENCY
vs. LED CURRENT (LED1 STRING)
90
88
86
84
100
95
90
LED1, LED2: 7 LEDs
LED3 TO LED5: 8 LEDs
V OUT = 23.86V
90
80
70
4 LEDs
6 LEDs
8 LEDs
82
85
80
LED1, LED2: 8 LEDs
60
78
76
74
72
70
5 LEDs: V OUT = 15.21V
6 LEDs: V OUT = 18.11V
7 LEDs: V OUT = 21.02V
8 LEDs: V OUT = 24.01V
9 LEDs: V OUT = 26.93V
80
75
70
65
LED3 TO LED5: 8 LEDs
V OUT = 26.81V
50
40
30
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
5
10
15
20
25
INPUT VOLTAGE (V)
CONVERTER EFFICIENCY
vs. LED CURRENT (LED1 AND LED2 STRINGS)
INPUT VOLTAGE (V)
LED1, LED2 CURRENT ACCURACY
vs. LED CURRENT
LED CURRENT (mA)
LED3-TO-LED5 CURRENT ACCURACY
vs. LED CURRENT
90
3 LEDs
5 LEDs
10
8
10
8
I LED5 (I LED4 = I LED3 = 5mA)
80
70
8 LEDs
6
4
I LED1 (I LED2 = 25.25mA)
6
4
I LED4 (I LED5 = I LED3 = 5mA)
2
2
60
0
0
50
40
30
-2
-4
-6
-8
-10
I LED2 (I LED1 = 25.25mA)
LED1, LED2: 8 LEDs
LED3 TO LED5: 9 LEDs AT 5mA
-2
-4
-6
-8
-10
I LED3 (I LED5 = I LED4 = 5mA)
LED1, LED2: 8 LEDs AT 25.25mA
LED3 TO LED5: 9 LEDs
0
5
10
15
20
25
0
5
10
15
20
25
0
1
2
3
4
5
LED CURRENT (mA)
LED CURRENT (mA)
LED CURRENT (mA)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5
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