MIC4685_10 Datasheet, PDF (6/17 Pages) Micrel Semiconductor – 3A SPAK SuperSwitcher Buck Regulator

Micrel, Inc.
Typical Characteristics
(TA = 25°C unless otherwise noted)
Efficiency
vs. Output Current
100
90
V_IN = 8V _{VIN = 12V}
80
70
V_IN = 30V
60
50
40
30
20
Standard
Configuration
10
V_OUT = 5.0V
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT CURRENT (A)
Efficiency
vs. Output Current
90
80 ^{VIN = 8V}
70
V_IN = 24V
60
50
V_IN = 30V
40
V_IN = 12V
30
20
Standard
Configuration
10
V_OUT = 1.8V
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT CURRENT (A)
January 2010
Efficiency
vs. Output Current
90
80
V_IN = 5V _{VIN = 12V}
70
60
50 ^{VIN = 16V}
40
30
20
Bootstrap
10
Configuration
V_OUT = 1.8V
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT CURRENT (A)
Bootstrap Drive Current
vs. Input Voltage
350
300
250
200
150
100
50
V_IN = 12V
V_FB = 1.5V
0
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
6
MIC4685
Quiescent Current
vs. Input Voltage
6.3
6.2
6.1
6
5.9
5.8
V_EN= 5V
5.7
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Minimum Duty Cycle
vs. Input Voltage
12
10
8
6
4
2
V_OUT = 1.8V
0
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
M9999-012610