MAX8831(2008) View Datasheet(PDF) - Maxim Integrated
Part Name
Description
View to exact match
MAX8831
(Rev.:2008)
(Rev.:2008)
Maxim Integrated
MAX8831 Datasheet PDF : 27 Pages
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High-Efficiency, White LED Step-Up Converter
with I2C Interface in 2mm x 2mm WLP
Typical Operating Characteristics
(VIN = 3.6V, VDD = 1.8V, CIN = 1µF, COUT = 1µF, CVDD = 0.1µF, CCOMP = 0.22µF, L = TOKO 1098AS-100M, ILED1 = ILED2 = 25.25mA,
ILED3 = ILED4 = ILED5 = 5mA, unless otherwise noted.)
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED1 STRING)
100
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED1 AND LED2 STRINGS)
100
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED3 STRING)
85
95
90
85
80
4 LEDs: VOUT = 13.35V
5 LEDs: VOUT = 16.63V
75
6 LEDs: VOUT = 19.83V
7 LEDs: VOUT = 23.07V
8 LEDs: VOUT = 26.23V
70
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
95
90
85
80
75
4 LEDs: VOUT = 13.37V
70
5 LEDs: VOUT = 16.61V
6 LEDs: VOUT = 19.78V
65
7 LEDs: VOUT = 23.02V
8 LEDs: VOUT = 26.17V
60
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
80
75
70
65
60
5 LEDs: VOUT = 15.04V
6 LEDs: VOUT = 17.97V
7 LEDs: VOUT = 20.97V
55
8 LEDs: VOUT = 23.97V
9 LEDs: VOUT = 26.81V
50
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)
90
88
86
84
82
80
78
76
5 LEDs: VOUT = 15.21V
6 LEDs: VOUT = 18.11V
74
7 LEDs: VOUT = 21.02V
72
8 LEDs: VOUT = 24.01V
9 LEDs: VOUT = 26.93V
70
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (LED1–LED5 STRINGS)
100
LED1, LED2: 7 LEDs
95 LED3 TO LED5: 8 LEDs
VOUT = 23.86V
90
85
LED1, LED2: 8 LEDs
80
LED3 TO LED5: 8 LEDs
VOUT = 26.81V
75
70
65
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
CONVERTER EFFICIENCY
vs. LED CURRENT (LED1 STRING)
90
4 LEDs
6 LEDs
80 8 LEDs
70
60
50
40
30
0
5
10
15
20
25
LED CURRENT (mA)
CONVERTER EFFICIENCY
vs. LED CURRENT (LED1 AND LED2 STRINGS)
90
3 LEDs
5 LEDs
80 8 LEDs
70
60
50
40
30
0
5
10
15
20
25
LED CURRENT (mA)
LED1, LED2 CURRENT ACCURACY
vs. LED CURRENT
10
8
6
ILED1 (ILED2 = 25.25mA)
4
2
0
-2
-4
ILED2 (ILED1 = 25.25mA)
-6
LED1, LED2: 8 LEDs
-8 LED3 TO LED5: 9 LEDs AT 5mA
-10
0
5
10
15
20
25
LED CURRENT (mA)
LED3-TO-LED5 CURRENT ACCURACY
vs. LED CURRENT
10
8
ILED5 (ILED4 = ILED3 = 5mA)
6
ILED4 (ILED5 = ILED3 = 5mA)
4
2
0
-2 ILED3 (ILED5 = ILED4 = 5mA)
-4
-6
-8
LED1, LED2: 8 LEDs AT 25.25mA
LED3 TO LED5: 9 LEDs
-10
0
1
2
3
4
5
LED CURRENT (mA)
_______________________________________________________________________________________ 5
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