Micrel, Inc.
MIC2225
February 2008
6
M9999-022008-D
Typical Characteristics (DC-DC)
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
1.2V Efficiency @ 40癈
2.7V
IN
5.5V
IN
3.6V
IN
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
1.2V Efficiency @ 25癈
2.7VIN
5.5V
IN
3.6V
IN
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
1.2V Efficiency @ 70癈
2.7V
IN
5.5V
IN
3.6V
IN
0
25
50
75
100
125
150
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Quiescent Current
vs. Input Voltage
V
OUT
= 1.2V
LOAD = 0
ENLDO = 0V
EN = V
IN
0
200
400
600
800
1000
1200
Quiescent Current
vs. Load Current
V
OUT
= 1.2V
EN = V
IN
ENLDO = 0V
40 60
LOAD CURRENT (mA)
30 50
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Enable Threshold
vs. Input Voltage
V
OUT
= 1.19V
ENLDO = 5V
0
10
20
30
40
50
60
70
80
90
100
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Turn-On Time
vs. Input Voltage
V
OUT
= 1.19V
VLDO = 2.8V
ENLDO = 5V
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Peak Current Limit
vs. Input Voltage
V
OUT
= 1.2V
EN = ENLDO = V
IN
1.5
1.7
1.9
2.1
2.3
2.5
2.7
2.9
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Frequency
vs. Input Voltage
V
OUT
= 1.2V
LOAD = 0
ENLDO = V
IN