MAX8831 MAXIM [Maxim Integrated Products], MAX8831 Datasheet - Page 5

• Manufacturer Part Number: MAX8831
• Description: High-Efficiency, White LED Step-Up Converter with I2C Interface in 2mm x 2mm WLP
• Manufacturer: MAXIM [Maxim Integrated Products]

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