AAT3113, AAT3114/14A
High Efficiency 1.5X Fractional Charge
Pumps 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.
Normalized Current Level Settings
1.0
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
20mA max
Code
20mA max
1
2
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
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
3.529
4.000
3
4.471
4
5.020
5
5.647
6
6.353
7
7.059
8
7.922
9
8.941
10
11
12
13
14
15
16
10.039
11.216
12.627
14.118
15.843
17.804
20.000
Table 1: Current Level Settings.
3113.2006.07.1.9
9
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
