MIC2873 Datasheet, PDF (5/24 Pages) Micrel Semiconductor – 1.2A High-Brightness Flash LED Driver with Single-Wire Serial Interface

Micrel, Inc.
Typical Characteristics
Shutdown Current
vs. Temperature
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-40 -20
F_SW = 2MHz
V_DC = 0V
0 20 40 60 80 100 120
TEMPERATURE (°C)
Switching Frequency
vs. Temperature
2.20
2.15
2.10
2.05
2.00
1.95
1.90
1.85
V_IN = 3.6V
1.80
-40 -20 0
20 40 60 80 100 120
TEMPERATURE (°C)
LED Short Test Current
vs. Temperature
2.3
2.2
2.1
2.0
1.9
1.8
1.7
-40 -20
F_SW = 2MHz
V_IN = 3.6V
0 20 40 60 80 100 120
TEMPERATURE (°C)
MIC2873
Standby Current
vs. Temperature
185
180
175
170
165
160
F_SW = 2MHz
V_DC = 3.6V
155
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
UVLO Thresholds
vs. Temperature
2.8
2.7
2.6
RISING
2.5
2.4
FALLING
2.3
2.2
-40 -20
F_SW = 2MHz
0 20 40 60 80 100 120
TEMPERATURE (°C)
Maximum Duty Cycle
vs. Temperature
100
90
80
70
60
50
-40 -20
F_SW = 2MHz
V_IN = 3.6V
0 20 40 60 80 100 120
TEMPERATURE (°C)
LED Short Threshold Voltage
vs. Temperature
2.0
1.9
1.8
1.7
1.6
1.5
1.4
-40 -20
F_SW = 2MHz
V_IN = 3.6V
0 20 40 60 80 100 120
TEMPERATURE (°C)
Boost Switching Frequency
vs. Input Voltage
2.20
2.15
2.10
2.05
T_A = -40°C _{TA = 25°C}
2.00
1.95
1.90
1.85
T_A = 85°C
L = 1 µH
C_OUT = 4.7µF
I_LED = 1.2A
1.80
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
WLED Power Efficiency
vs. Input Voltage (V_F = 3.4V)
100
90
80
I_LED =1.2A
I_LED =1.0A
70
I_LED =600mA
I_LED =400mA
60 ^{L = 1µH}
C_OUT = 4.7µF
I_LED =250mA
I_LED =100mA
LED V_F = 3.4V
50
2.6 3.0 3.4 3.8 4.2 4.6 5.0
INPUT VOLTAGE (V)
July 17, 2014
5
Revision 1.0