Micrel
Typical Characteristics
MIC2297
6
Supply Current
vs. Input Voltage
100
Max Duty Cycle
vs. Input Voltage
800
Frequency
vs. Input Voltage
5.5
99
700
5
4.5
4
98
97
600
3.5
Not Switching
V FB = 1V
96
500
2
2
2
3
3
4 5 6 7 8 9
10
95
3
4 5 6 7 8 9
10
400
3
4 5 6 7 8 9
10
INPUT VOLTAGE (V)
Switch Current
INPUT VOLTAGE (V)
Switch Voltage
INPUT VOLTAGE (V)
LED Current
1200
vs. Switch Voltage
220
vs. Input Voltage
20
vs. Input Voltage
1000
800
600
400
215
210
205
200
18
16
14
200
V IN = 3.6V
195
I FSWITCH = 0.5A
12
0
2
2
0
500 1000 1500
190
3
4 5 6 7 8 9
10
10
3
4 5 6 7 8 9
10
SWITCH CURRENT (mA)
BRT Voltage
INPUT VOLTAGE (V)
FB Voltage
INPUT VOLTAGE (V)
LED Current
1.5
vs. Input Voltage
300
vs. Input Voltage
30
vs. BRT Voltage
1.4
1.3
1.2
1.1
1
0.9
0.8
280
260
240
220
200
180
160
25
20
15
10
2
2
0.7
0.6
0.5
3
4 5 6 7 8 9
INPUT VOLTAGE (V)
10
140
120
100
3
4 5 6 7 8 9
INPUT VOLTAGE (V)
10
5
0
R SENSE
10001200
BRT VOLTAGE (mV)
FB Voltage
Efficiency for 10 LEDs @ 20mA
Efficiency for 10 LEDs
300
250
200
vs. BRT Voltage
80
78
76
vs. Input Voltage
80
75
70
65
vs. LED Current
V IN = 4.2V
V IN = 3.2V
V IN = 3.6V
150
60
100
74
55
50
72
L = 6.8μH
50
45
L = 6.8μH
2
0
0
10001200
70
3
4 5 6 7 8 9
10
40
5
10 15 20 25 30
35
BRT VOLTAGE (mV)
Mach 2008
INPUT VOLTAGE (V)
4
LED CURRENT (mA)
M9999-032708
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