MIC2871 Datasheet, PDF (5/24 Pages) Micrel Semiconductor – 1.2A High-Brightness LED Flash Driver with Single-Wire Serial Interface

Micrel, Inc.
Typical Characteristics
Shutdown Current
vs. Temperature
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
WLED Power Efficiency
vs. Input Voltage
100
90
80 _{ILED = 1.0A}
I_LED = 1.2A
I_LED = 640mA
70
I_LED = 400mA
60
L = 1µH
C_OUT = 4.7µF
I_LED = 250mA
I_LED = 100mA
50
2.6 3.0 3.4 3.8 4.2 4.6 5.0
INPUT VOLTAGE (V)
Flash Mode ILED(MAX)
vs. FRSET Resistor
1200
1000
800
600
400
200
L = 1 µH
COUT = 4.7µF
0
0
10
20
30
40
50
60
FRSET RESISTOR (kΩ)
Standby Current
vs. Temperature
245
240
235
230
225
220
-40
-20 0 20 40 60 80
TEMPERATURE (°C)
100 120
Torch Mode LED Current
vs. Temperature
270
265
260
255
250
245
240
235
230
-40 -20
L = 1µH
C_OUT = 4.7µF
I_LED = 250mA
R_FRSET = 20kΩ
0 20 40 60 80 100 120
TEMPERATURE (°C)
Torch Mode ILED(MAX)
vs. FRSET Resistor
300
250
200
150
100
50 _{L = 1 µH}
COUT = 4.7µF
0
0
10
20
30
40
50
60
FRSET RESISTOR (kΩ)
MIC2871
Boost Switching Frequency
vs. Input Voltage
2.20
2.15
-40°C
2.10
25°C
2.05
2.00
1.95
1.90
1.85
L = 1 µH
COUT = 1µF
ILED = 1A
75°C
125°C
1.80
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
Flash Mode LED Current
vs. Temperature
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
-40 -20
L = 1µH
C_OUT = 4.7µF
I_LED = 1A
R_FRSET = 20kΩ
0 20 40 60 80 100 120
TEMPERATURE (°C)
Flash Mode ILED(MAX)
Accuracy vs. Input Voltage
3.5
3.0 ^{RFRSET = 17kΩ}
2.5
2.0
1.5
1.0
0.5
0.0 ^{RFRSET = 30kΩ}
-0.5 ^{RFRSET = 39kΩ}
R_FRSET = 51kΩ
-1.0
R_FRSET = 20kΩ
-1.5 ^{RFRSET = 62kΩ}
3.5
3.7
3.9
4.1
4.3
INPUT VOLTAGE (V)
May 29, 2013
5
052913-1.0 (while in progress)
Revision 1.0 (final document)