AME, Inc.
White LED Boost Converter
In Tiny Package
AME5142
Max Duty Cycle vs. Temperature
Oscillator Frequency vs. Temperature
92.0
91.8
91.6
91.4
91.2
91.0
90.8
90.6
90.4
90.2
90.0
89.8
89.6
89.4
89.2
89.0
88.8
88.6
88.4
88.2
88.0
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
-25
0
25
50
75
100
125
-25
0
25
50
75
100
125
Temperature (oC)
Temperature (oC)
Switch RDSON
Efficiency vs. Load Current
Dirving 3 LEDs
100
1.80
1.60
1.40
1.20
1.00
0.80
90
80
70
60
50
TA = 85oC
TA = 25oC
0.60
0.40
0.20
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
VIN (V)
VIN (V)
Efficiency vs. Load Current
Dirving 4 LEDs
Efficiency vs. Load Current
Dirving 6 LEDs
100
90
80
70
60
50
100
90
80
70
60
50
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
VIN (V)
VIN (V)
Rev.A.01
11
AME [ ANALOG MICROELECTRONICS ]
