MIC4680 Datasheet, PDF (6/16 Pages) Micrel Semiconductor – 1A 200kHz SuperSwitcher™ Buck Regulator Final Information

MIC4680
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
Safe
Operating Area
Minimum
Current Limit
Note
V_OUT = 5V
T_A = 60°C
Demonstration
board layout
5
10
15
20
25
30
35
INPUT VOLTAGE (V)
Note. For increased output current, see “Applications Information:
Increasing the Maximum Output Current” and Figure 3.
Functional Characteristics
Switching Frequency Foldback
200kHz
Normal
Operation
60kHz
TIME
Short
Circuit
Operation
Frequency Foldback
The MIC4680 folds the switching frequency back during a hard
short-circuit condition to reduce the energy per cycle and
protect the device.
Load Transient
V_IN = 12V
V_OUT = 5V
I_OUT = 1.0A to 0.1A
TIME (100ms/div.)
Micrel
5.1V
5V
1A
0A
MIC4680
6
June 2000