MIC2225_08 Datasheet, PDF (6/15 Pages) Micrel Semiconductor – 2MHz 600mA Synchronous Buck Regulator with 300mA LDO

Micrel, Inc.
Typical Characteristics (DC-DC)
1.2V Efficiency @ –40°C
100
90
80
70
60
50
40
30
20
10
00
2.7V_IN
5.5V_IN
3.6V_IN
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
Quiescent Current
vs. Input Voltage
150
125
100
75
50
V_OUT = 1.2V
LOAD = 0
25
ENLDO = 0V
EN = V_IN
20.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
100
90
80
70
60
50
40
30
20
10
20.5
Turn-On Time
vs. Input Voltage
V_OUT = 1.19V
VLDO = 2.8V
ENLDO = 5V
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
1.2V Efficiency @ 25°C
100
90
80
70
60
50
40
30
20
10
00
2.7VIN
5.5V_IN
3.6V_IN
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
Quiescent Current
vs. Load Current
1200
1000
800
600
400
200
V_OUT = 1.2V
EN = V_IN
ENLDO = 0V
0
30 40 50 60
LOAD CURRENT (mA)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
20.5
Peak Current Limit
vs. Input Voltage
V_OUT = 1.2V
EN = ENLDO = V_IN
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
MIC2225
1.2V Efficiency @ 70°C
100
90
80
70
60
50
40
30
20
10
00
2.7V_IN
5.5V_IN
3.6V_IN
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
Enable Threshold
vs. Input Voltage
1.4
1.2
1.0
0.8
0.6
0.4
0.2
20.5
V_OUT = 1.19V
ENLDO = 5V
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
Frequency
vs. Input Voltage
2.9
2.7
2.5
2.3
2.1
1.9
1.7
1.25.5
V_OUT = 1.2V
LOAD = 0
ENLDO = V_IN
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
February 2008
6
M9999-022008-D