MIC23031 Datasheet, PDF (4/17 Pages) Micrel Semiconductor – 4MHz PWM 400mA Buck Regulator with Hyper Light Load™

Micrel Inc.
Typical Characteristics
Efficiency VOUT = 2.5V
100
= 3.0V
90
80
= 4.2V
= 3.6V
70
60
L
501
10
100
1000
OUTPUT CURRENT (mA)
Efficiency
with Various Inductors
100
L = 4.7
90
L = 2.2
80
70 _{L = 0.47}
L = 1.0
60
501
2
1.95
1.9
1.85
1.8
1.75
1.7
1.65
1.61
10
100
1000
OUTPUT CURRENT (mA)
Output Voltage
vs Output Current
= 4.2V
= 3.6V
= 3.0V
L
10
100
1000
OUTPUT CURRENT (mA)
SW Frequency
vs Output Current
10
= 3.0V
= 3.6V
1
= 4.2V
0.1
0.011
L
10
100
1000
OUTPUT CURRENT (mA)
Efficiency VOUT = 1.8V
100
90
= 2.7V
= 3.0V
80
70
= 3.6V
= 4.2V
60
L
501
10
100
1000
OUTPUT CURRENT (mA)
Quiescent Current
vs Input Voltage
40
35
30
25
20
15
10
5
0
2.7 3.2 3.7 4.2 4.7 5.2 5.7
INPUT VOLTAGE (V)
Output Voltage
vs Temperature
1.9
= 1.8V
1.8
1.7
1.6
L
1.5
20 40 60 80
TEMPERATURE (C°)
SW Frequency
vs Output Current
10
=
1
=
0.1
=
=
0.01
0.001
1
10
100
1000
OUTPUT CURRENT (mA)
MIC23031
Efficiency VOUT = 1.2V
100
90
= 3.0V
= 2.7V
80
70
= 4.2V
= 3.6V
60
L
501
10
100
1000
OUTPUT CURRENT (mA)
1.9
1.88
1.86
1.84
1.82
1.8
1.78
1.76
1.74
1.72
1.7
2.7
Output Voltage
vs Input Voltage
50mA
1mA
10mA
150mA
300mA
400mA
L
3.2 3.7 4.2 4.7 5.2 5.7
INPUT VOLTAGE (V)
Frequency vs
Temperature
5
4.5
4
3.5
3
20 40 60 80
TEMPERATURE (C°)
Enable Threshold
vs. Input Voltage
1.2
Enable ON
1
0.8
Enable OFF
0.6
0.4
0.2
0
2.7 3.2 3.7 4.2 4.7 5.2 5.7
INPUT VOLTAGE (V)
May 2008
4
M9999-051608-A