MIC23250_10 Datasheet, PDF (6/20 Pages) Micrel Semiconductor – 4MHz Dual 400mA Synchronous Buck Regulator with HyperLight Load

Micrel, Inc.
Typical Characteristics (Continued)
Efficiency V _OUT = 1.8V
100
90 ^{VIN = 2.7V VIN = 3.0V}
80
70 VIN = 4.2V
VIN = 3.6V
60
50
40
30
20
10
011
L = 1µH
C_OUT = 4.7µF
0
100
1000
OUTPUT CURRENT (mA)
Efficiency V _OUT = 1.8V
With Various Inductors
100
90
L = 1.5µH
80
70
L = 1.0µH
L = 0.47µH
60
50
40
30
20
10
011
V_IN = 3.6V
C_OUT = 4.7µF
0
100
1000
OUTPUT CURRENT (mA)
Efficiency V _OUT = 2.5V
100 _{VIN = 2.7V}
90
80
70 VIN = 4.2V
VIN = 3.6V
60
VIN = 3.0V
50
40
30
20
10
011
L = 1µH
C_OUT = 4.7µF
0
100
1000
OUTPUT CURRENT (mA)
Dual Output Efficiency
100
90
VIN = 3.3V
80
70 _{VIN = 3.6V}
60
VIN = 4.2V
50
40 _{VOUT1 = 1.575V}
30 VOUT2 = 1.8V
20 ^{Load1 = Load2}
L1 = L2 = 1µH
10 _{COUT1 = COUT2 = 4.7µF}
011
0
100
1000
OUTPUT CURRENT (mA)
MIC23250
Efficiency V _OUT = 3.3V
100
90
80
70
60
50
40
30
20
10
011
VIN = 4.2V
VIN = 5.5V
VIN = 5.0V
L = 1µH
C_OUT = 4.7µF
0
100
1000
OUTPUT CURRENT (mA)
June 2010
6
M9999-061110-E