Micrel
Typical Characteristics (continued)
MIC2297
Efficiency for 10 LEDs
Efficiency for 9 LEDs
Efficiency for 9 LEDs
85
80
75
70
65
vs. LED Current
V IN = 4.2V
V IN = 3.2V V IN = 3.6V
80
75
70
65
vs. LED Current
V IN = 4.2V
V IN = 3.6V
V IN = 3.2V
85
80
75
70
65
vs. LED Current
V IN = 4.2V
V IN = 3.2V
V IN = 3.6V
60
55
60
55
60
55
0
0
0
50
45
40
35
L = 15μH
10 20 30
LED CURRENT (mA)
40
50
45
40
5
L = 6.8μH
10 15 20 25 30 35
LED CURRENT (mA)
50
45
40
35
5
L = 15μH
10 15 20 25 30 35 40
LED CURRENT (mA)
35
LED Current
vs. Duty Cycle
L1 = Murata LQH32CN100K11
L1
30
25
5V
4V
3V
2V
C1
1μF, 16V
VIN
SW
C2
0.47μF, 50V
COMP
20
15
10
2V peak PWM
C3
0.22μF, 10V
PWM
REF
BRT
MIC2297BML
EN OVP
AGND PGND FB
C4
0.1μF, 10V
0
5
0
20
PWM = 20kHz
R SENSE
40 60 80 100
DUTY CYCLE (%)
Mach 2008
5
M9999-032708
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