MIC3287
Micrel, Inc.
Typical Characteristics
85
80
EFFICIENCY (%)
3 Series
White LED Efficiency
V
IN
=3.6V
85
80
EFFICIENCY (%)
4 Series
White LED Efficiency
V
IN
=3.6V
V
IN
=3.2V
12
ENABLE PIN CURRENT (µA)
Enable Pin Current
vs. Temperature
V
EN
=5V
75
V
IN
=3.2V
70
65
60
55
50
45
2
75
70
65
60
55
50
45
2
10
8
6
4
2
V
IN
=4.2V
V
IN
=4.2V
V
EN
=2.5V
V
EN
=1.8V
V
EN
=3.3V
L = 10µH
C
OUT
= 0.22µF
4 6 8 10 12 14 16 18 20
WHITE LED CURRENT (mA)
L = 10µH
C
OUT
= 0.22µF
4 6 8 10 12 14 16 18 20
WHITE LED CURRENT (mA)
0
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
1.5
FREQUENCY (MHz)
Frequency
vs. Temperature
260
FEEDBACK VOLTAGE (mV)
Feedback Voltage
vs. Temperature
254
FEEDBACK VOLTAGE (mV)
Feedback Voltage
vs. Input Voltage
1.4
1.3
1.2
1.1
V
IN
=4.2V
V
IN
=3.6V
V
IN
=3.2V
256
252
248
244
240
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
253
252
251
250
249
248
2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6
INPUT VOLTAGE (V)
V
IN
=3.6V
1.0
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
QUIESCENT CURRENT (mA)
0.003
SHUTDOWN CURRENT (uA)
Shutdown Current
vs. Input Voltage
2.5
2.4
2.3
2.2
2.1
Quiescent Current
vs. Input Voltage
900
CURRENT LIMIT (mA)
Curremt Limit
vs. Temperature
850
800
750
700
650
600
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
V
IN
=3.6V
0.002
0.001
2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6
INPUT VOLTAGE (V)
2.0
2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6
INPUT VOLTAGE (V)
840
CURRENT LIMIT (mA)
Current Limit
vs. Input Voltage
820
800
780
760
740
720
2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6
INPUT VOLTAGE (V)
M9999-010306
4
January 2006