MIC4680 Micrel Semiconductor, MIC4680 Datasheet - Page 6

• Manufacturer Part Number: MIC4680
• Description: 1A 200kHz SuperSwitcher Buck Regulator Final Information
• Manufacturer: Micrel Semiconductor

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