MIC23250 Micrel Semiconductor, MIC23250 Datasheet - Page 4

• Manufacturer Part Number: MIC23250
• Description: 4MHz Dual 400mA Synchronous Buck Regulator
• Manufacturer: Micrel Semiconductor

Typical Characteristics
Micrel, Inc.
December 2007
700
650
600
550
5.0
4.5
4.0
3.5
3.0
1.9
1.8
1.7
1.6
1.5
50
45
40
35
30
25
20
15
10
5
0
2.7
2.7
3.2
3.2
Quiescent Current
vs. Input Voltage
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
vs. Input Voltage
vs. Temperature
TEMPERATURE (°C)
vs. Temperature
TEMPERATURE (°C)
Output Voltage
Current Limit
VOUT1 = 1.575V
VOUT2 = 1.8V
3.7
3.7
Frequency
20 40 60 80
20 40 60 80
4.2
4.2
L = 1µH
C
Load = 120mA
L = 1µH
C
Load = 120mA
L = 1µH
C
L = 1µH
C
OUT
OUT
OUT
OUT
4.7
4.7 5.2
= 4.7µF
= 4.7µF
= 4.7µF
= 4.7µF
5.2 5.7
5.7
4MHz
0.01
1.90
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
1.72
1.70
100
0.1
1.2
1.0
0.8
0.6
0.4
0.2
10
90
80
70
60
50
40
30
20
10
1
0
0
1
1
1
VIN = 2.7V
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
Efficiency V
Switching Frequency
V
vs. Output Current
IN
vs. Output Current
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
V
VIN = 4.2V
Enable Threshold
vs. Temperature
TEMPERATURE (°C)
IN
= 3.6V
Output Voltage
VIN = 3.0V
= 3.0V
10
10
10
20 40 60 80
LOAD (mA)
VIN = 3.0V
V
IN
4
= 4.2V
OUT
L = 1µH
C
VIN = 3.6V
V
L = 1µH
C
L = 1µH
C
VIN = 3.6V
OUT
100
100
100
OUT
OUT
OUT
VIN = 5.5V
= 1.8V
= 4.7µF
= 1.8V
= 4.7µF
= 4.7µF
1000
1000
1000
0.950
0.850
1.000
0.975
0.925
0.900
0.875
0.825
0.800
4MHz
0.01
1.88
1.86
1.84
1.82
1.78
1.76
1.74
1.72
1.90
1.80
1.70
100
0.1
90
80
70
60
50
40
30
20
10
10
2.7
1
2.7
0
1
1
Load = 50mA
L = 4.7µH
L = 1µH
C
Efficiency V
OUT
Switching Frequency
3.2
3.2
Load = 10mA
vs. Output Current
OUTPUT CURRENT (mA)
vs. Input Voltage
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Enable Threshold
INPUT VOLTAGE (V)
vs. Input Voltage
INPUT VOLTAGE (V)
Enable ON
Output Voltage
= 4.7µF
Load = 400mA
L = 1.5µH
3.7
3.7
L = 1.0µH
10
10
LOAD (mA)
L = 2.2µH
4.2
4.2
Load = 300mA
M9999-121707-A
Enable OFF
V
V
Load = 150mA
OUT
V
V
C
V
C
Load = 1mA
L = 1µH
IN
OUT
100
100
IN
OUT
IN
OUT
OUT
Load = 150mA
4.7 5.2 5.7
4.7
L = 0.47µH
= 3.6V
= 3.6V
= 3.6V
= 1.8V
= 1.8V
MIC23250
= 1.8V
= 4.7µF
= 4.7µF
5.2 5.7
1000
1000