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MIC4685 Datasheet, PDF (5/15 Pages) Micrel Semiconductor – 3A SPAK SuperSwitcher™ Buck Regulator
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MIC4685
Typical Characteristics
(TA = 25°C unless otherwise noted)
Efficiency
vs. Output Current
100
90
VIN = 8V VIN = 12V
80
70
VIN = 30V
60
50
40
30
20
Standard
Configuration
10
VOUT = 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
VIN = 24V
60
50
VIN = 30V
40
VIN = 12V
30
20
Standard
Configuration
10
VOUT = 1.8V
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
100
90
VIN = 5V VIN = 12V
80
70
60 VIN = 16V
50
40
30
20
Bootstrap
Configuration
10
VOUT = 2.5V
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT CURRENT (A)
Bootstrap Voltage
vs. Input Voltage
7
6
5
4
3
2
1
VIN = 12V
VFB = 1.5V
0
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
September 2002
Efficiency
vs. Output Current
100
90 VIN = 8V
80
70
60
VIN = 30V
VIN = 12V
50
40
30
20
Standard
Configuration
10
VOUT = 3.3V
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
100
90
VIN = 7.5V
80
70
60
VIN = 16V
VIN = 12V
50
40
30
20
Bootstrap
Configuration
10
VOUT = 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 = 5V VIN = 12V
70
60
50 VIN = 16V
40
30
20
Bootstrap
10
Configuration
VOUT = 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
VIN = 12V
VFB = 1.5V
0
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
5
Micrel
Efficiency
vs. Output Current
100
90 VIN = 8V
80
VIN = 24V
70
60
50
VIN = 30V
VIN = 12V
40
30
20
Standard
Configuration
10
VOUT = 2.5V
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
100
90 VIN = 4.5V
80
VIN = 12V
70
60
VIN = 5V
50 VIN = 16V
40
30
20
Bootstrap
Configuration
10
VOUT = 3.3V
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT CURRENT (A)
Quiescent Current
vs. Input Voltage
6.3
6.2
6.1
6
5.9
5.8
VEN= 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
VOUT = 1.8V
0
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
MIC4685
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