MIC2874 Datasheet, PDF (5/22 Pages) Micrel Semiconductor – 1.2A High-Brightness Flash LED Driver with Single-Wire Serial Interface

Micrel, Inc.
Typical Characteristics
Shutdown Current
vs. Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-40 -20
F_SW = 4MHz
V_DC = 0V
0 20 40 60 80 100 120
TEMPERATURE (°C)
Switching Frequency
vs. Temperature
4.20
4.15
4.10
4.05
4.00
3.95
3.90
3.85
V_IN = 3.6V
3.80
-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
F_SW = 4MHz
V_IN = 3.6V
1.7
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
MIC2874
Standby Current
vs. Temperature
205
200
195
190
185
180
175
170
-40
F_SW = 4MHz
V_DC = 3.6V
-20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Maximum Duty Cycle
vs. Temperature
100
90
80
70
60
F_SW = 4MHz
V_IN = 3.6V
50
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Boost Switching Frequency
vs. Input Voltage
4.4
4.3
4.2
T_A = -40°C
4.1
T_A = 25°C
4.0
3.9
3.8
3.7
3.6
2.5
T_A = 85°C
L = 0.47µH
C_OUT = 4.7µF
I_LED = 1.2A
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
UVLO Thresholds
vs. Temperature
2.8
2.7
2.6
RISING
2.5
2.4
FALLING
2.3
F_SW = 4MHz
2.2
-40 -20 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
F_SW = 4MHz
V_IN = 3.6V
1.4
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
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
I_LED =250mA
L = 0.47µH, 30mΩ ^{ILED =100mA}
C_OUT = 4.7µF
LED V_F = 3.4V
50
2.6 3.0 3.4 3.8 4.2 4.6 5.0
INPUT VOLTAGE (V)
August 26, 2014
5
Revision 1.0