MIC4680 Datasheet, PDF (5/16 Pages) Micrel Semiconductor – 1A 200kHz SuperSwitcher™ Buck Regulator Final Information

MIC4680
Typical Characteristics
Line Regulation
5.06
5.05 ^IOUT ^{= 1.0A}
5.04
5.03
5.02
5.01
5.00
4.99
4.98
4.97
4.96
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
Shutdown Current
vs. Temperature
4.0
3.5
V_IN = 12V
V_SHDN = V_IN
3.0
2.5
2.0
1.5
1.0
0.5
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
Frequency vs.
Temperature
220
210
200
190
180
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
3.3V Output
Efficiency
80
70
60
24V 6V
50
12V
40
30
20
10
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
June 2000
Load Regulation
5.04
5.02
V_IN = 12V
V_OUT = 5V
5.00
4.98
4.96
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
Current Limit
Characteristic
6
5
4
3
2
1 V_IN = 12V
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
OUTPUT CURRENT (A)
1.242
Feedback Voltage
vs. Temperature
1.240
1.238
1.236
1.234
1.232
V_IN = 12V
1.230
V_OUT = 5V
I_OUT = 1A
1.228
-50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
5V Output
Efficiency
90
80
70
7V
60
12V ^24V
50
40
30
20
10
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
5
Micrel
Shutdown Current
vs. Input Voltage
100
80
60
40
20
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
Frequency vs.
Supply Voltage
202
201
200
199
198
197
196
0
5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
Saturation Voltage
vs. Temperature
1.6
1.4
1.2
1.0
0.8
0.6
V_IN = 12V
0.4 _{VOUT = 5V}
0.2 ^I_LOAD ^{= 1A}
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
12V Output
Efficiency
100
90
80
70
15V
24V
60
50
40
30
20
10
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
MIC4680