MIC2298 Datasheet, PDF (4/13 Pages) Micrel Semiconductor – 3.5A Minimum, 1MHz Boost High Brightness White LED Driver

Micrel, Inc.
Typical Characteristics
Input Current
vs. Input Voltage
20
16
12
8
4
0
0 2 4 6 8 10 12
INPUT VOLTAGE (V)
Switching Frequency
vs. Temperature
1.2
1.1
1.0
0.9
V_IN = 5V
0.-840 _{-20 0 20 40 60 80}
TEMPERATURE (°C)
1100
1000
900
800
700
600
500
400
300
200
100
00
LED Current
vs. DIM Voltage
40 80 120 160 200
DIM VOLTAGE (mV)
Max DC LED Current
vs. Output Voltage
1.0
0.9
0.8
25°C
0.7
0.6
50°C
0.5
0.4
0.3
0.2
0.1
00
2
4
6
V_IN = 3.0V
8 10 12 14
OUTPUT VOLTAGE (V)
October 2007
UVLO vs.
Temperature
2.4
2.3
2.2
2.1
2.0
1.9
1.8
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
LED Current vs.
Input Voltage (BRT GND)
0.210
0.205
0.200
0.195
0.1920.5
R_SENSE
T_CASE = 25°C
3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
Efficiency vs.
Input Voltage (BRT Open)
95
90
85
80
75
70
65
R_SENSE
620.5 _{3 3.5 4 4.5 5 5.5 6 6.5}
INPUT VOLTAGE (V)
Max DC LED Current
vs. Output Voltage
1.0
0.9
0.8
25°C
0.7
0.6
50°C
0.5
0.4
0.3
0.2
0.1
00
2
4
6
V_IN = 3.6V
8 10 12 14
OUTPUT VOLTAGE (V)
4
MIC2298
Switching Frequency
vs. Input Voltage
1.2
1.1
1.0
0.9
T_A = 25°C
0.82 _{3 4 5 6 7 8 9 10 11}
INPUT VOLTAGE (V)
LED Current vs.
Input Voltage (BRT Open)
1.00
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.920.5
R_SENSE
T_CASE = 25°C
3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
Efficiency vs.
Input Voltage (BRT GND)
95
90
85
80
75
70
65
R_SENSE
60
2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
Bipolar Saturation Voltage
vs. Switch Current
500
450
400
3.0V
350
300
3.6V
250
200
150
100
50
00
0.5
1
1.5
2
T_A = 25°C
2.5 3 3.5 4
SWITCH CURRENT (A)
M9999-101707-B