MIC23254 Datasheet, PDF (4/17 Pages) Micrel Semiconductor – 4MHz Dual 400mA Synchronous Buck Regulator with Low Input Voltage and HyperLight Load™

Micrel, Inc.
Typical Characteristics
50
45
40
35
30
25
20
15
10
5
0
2.5
Quiescent Current
vs. Input Voltage
L = 1µH
COUT = 4.7µF
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
Frequency
vs. Temperature
5
4.5
4
3.5
L = 1µH
COUT = 4.7µF
IOUT = 120mA
3
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Output Voltage
vs. Temperature
1.9
1.88
1.86
VIN = 5V
1.84
VIN = 4.2V
1.82
1.8
1.78
1.76
VIN = 3.6V
VIN = 2.5V
1.74
1.72
1.7
-40
L = 1µH
COUT = 4.7uF
IOUT = 20mA
-20 0 20 40 60 80 100 120
TEMPERATURE (°C)
MIC23254
Switching Frequency
vs. Output Current
10.00
VIN = 2.5V
1.00
VIN = 3V
VIN = 5V
0.10
VIN = 4.2V
0.01
0.001
VIN = 3.6V
VOUT = 1.8V
L = 1µH
COUT = 4.7µF
0.01
0.1
1
LOAD CURRENT (A)
Output Voltage
vs. Output Current
1.9
1.88
1.86
1.84
1.82
VIN = 4.2V
1.8
1.78
1.76
1.74
VIN = 2.5V
VIN = 3.6V
1.72
1.7
0.1
T_A = 25^oC
1
10
100
1000
OUTPUT CURRENT (mA)
Enable Threshold
vs. Temperature
1.2
1
ENon
0.8
ENoff
0.6
0.4
0.2
VIN = 3.6V
L = 1µH
COUT = 4.7µF
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
10
4MHz
Switching Frequency
vs. Output Current
L = 4.7µH
1
L = 1µH
0.1
L = 2.2µH
0.01
1
VIN = 3.6V
VOUT = 1.8V
COUT = 4.7µF
10
100
1000
OUTPUT CURRENT (mA)
Output Voltage
vs. Input Voltage
1.90
1.88
1.86
1.84
1.82
IOUT = 20mA
IOUT = 200mA
1.80
1.78
1.76
1.74
1.72
1.70
2.5
IOUT = 400mA
L = 1µH
COUT = 4.7µF
TA = 25°C
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
Enable Threshold
vs. Input Voltage
1.05
1
ENon
0.95
ENoff
0.9
0.85
0.8
2.5
TA = 25°C
L = 1µH
COUT = 4.7µF
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
May 2010
4
M9999-052510