Micrel, Inc.
MIC4680
Typical Characteristics
5.06
OUTPUT VOLTAGE (V)
5.05
5.04
5.03
5.02
5.01
5.00
4.99
4.98
4.97
4.96
Line Regulation
OUTPUT VOLTAGE (V)
5.04
Load Regulation
100
V
IN
= 12V
V
OUT
= 5V
Shutdown Current
vs. Input Voltage
I
OUT
= 1.0A
5.02
80
CURRENT (µA)
60
40
20
5.00
4.98
4.96
0
5
10 15 20 25 30
INPUT VOLTAGE (V)
35
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
0
0
5
10 15 20 25 30
INPUT VOLTAGE (V)
35
4.0
3.5
CURRENT (µA)
3.0
2.5
2.0
1.5
1.0
0.5
Shutdown Current
vs. Temperature
OUTPUT VOLTAGE (V)
V
IN
= 12V
V
SHDN
= V
IN
6
5
Current Limit
Characteristic
202
201
FREQUENCY (kHz)
200
199
198
197
196
0
Frequency vs.
Supply Voltage
4
3
2
1
0
V
IN
= 12V
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
OUTPUT CURRENT (A)
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
5 10 15 20 25 30
SUPPLY VOLTAGE (V)
35
220
Frequency vs.
Temperature
FEEDBACK VOLTAGE (V)
1.242
1.240
1.238
1.236
1.234
1.232
1.230
Feedback Voltage
vs. Temperature
SATURATION VOLTAGE (V)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Saturation Voltage
vs. Temperature
FREQUENCY (kHz)
210
200
190
180
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
V
IN
= 12V
V
OUT
= 5V
I
OUT
= 1A
V
IN
= 12V
V
OUT
= 5V
I
LOAD
= 1A
1.228
-50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
80
70
EFFICIENCY (%)
3.3V Output
Efficiency
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
12V
5V Output
Efficiency
EFFICIENCY (%)
60
50
40
30
20
10
0
0
12V
24V 6V
24V
7V
100
90
80
70
60
12V Output
Efficiency
15V
24V
0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
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)
March 2008
5
M9999-032808
MICREL [ MICREL SEMICONDUCTOR ]
