MIC2874 Datasheet, PDF (6/22 Pages) Micrel Semiconductor – 1.2A High-Brightness Flash LED Driver with Single-Wire Serial Interface

Micrel, Inc.
Typical Characteristics (Continued)
WLED Power Efficiency
vs. Input Voltage (V_F = 3.8V)
100
90
80
I_LED =1.2A
I_LED =1.0A
70
I_LED =600mA
I_LED =400mA
60
L = 0.47µH, 13mΩ
C_OUT = 4.7µF
I_LED
=250mA
I_LED =100mA
LED V_F = 3.8V
50
2.6 3.0 3.4 3.8 4.2 4.6 5.0
INPUT VOLTAGE (V)
10
8
6
4
2
0
-2
-4
-6
-8
-10
2.5
Full Torch ILED Accuracy
vs. Input Voltage
T_A = 115°C _{TA = 25°C}
T_A = -40°C
F_SW = 4MHz
I_LED = 300mA
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
MIC2874
Full Flash ILED Accuracy
vs. Input Voltage
10
8
6
4
T_A = 25°C T_A = 115°C
2
0
-2
T_A = -40°C
-4
-6
-8
F_SW = 4MHz
I_LED = 1.2A
-10
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
August 26, 2014
6
Revision 1.0