High Efficiency 1.5X Fractional Charge
Pump For White LED Applications
Applications Information
Current Level Settings
LED current level is set via the serial interface
according to a logarithmic scale where each code
is 1dB greater than the previous code. In this man-
ner, the LED brightness appears linear with each
increasing code.
AAT3194
Normalized Current Level Settings
1.0
Normalized Current to Full Scale
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Code
Code
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
20mA max
0.549
0.627
0.706
0.784
0.863
1.020
1.098
1.255
1.412
1.569
1.804
1.961
2.275
2.510
2.824
3.137
Code
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
20mA max
3.529
4.000
4.471
5.020
5.647
6.353
7.059
7.922
8.941
10.039
11.216
12.627
14.118
15.843
17.804
20.000
Table 1: Current Level Settings.
3194.2006.09.1.0
9
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
