MIC4681
Micrel
Typical Characteristics
Line Regulation
5.05
OUTPUT VOLTAGE (V)
5.03
5.01
4.99
4.97
4.95
0
Amb = 25°C
10 15 20 25 30
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
Load Regulation
5.05
5.03
5.01
4.99
4.97
4.95
0
SHUTDOWN CURRENT (µA)
Shutdown Current
vs. Input Voltage
100
90
80
70
60
50
40
30
20
10
0
0
5
Amb = 25°C
V
IN
= 12V
0.5
1.0
1.5
OUTPUT CURRENT (A)
2.0
V
SHDN
= 5V
Amb = 25°C
10 15 20 25 30
INPUT VOLTAGE (V)
35
5
Shutdown Current
vs. Input Voltage
14
SHUTDOWN CURRENT (µA)
12
10
8
6
4
2
0
0
5
V
SHDN
= V
IN
Amb = 25°C
10 15 20 25 30
INPUT VOLTAGE (V)
35
SHUTDOWN CURRENT (µA)
Shutdown Current
vs. Temperature
6.6
OUTPUT VOLTAGE (V)
Current Limit
Characteristics
6
5
4
3
2
1 V = 12V
IN
Amb = 25°C
0
0
0.5
1
1.5
2
2.5
OUTPUT CURRENT (A)
V
IN
= 12V
V
SHDN
= V
IN
6.4
6.2
6
5.8
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3
MIC4681BM Frequency
vs. Supply Voltage
205
215
FREQUENCY (KHz)
Frequency
vs. Temperature
210
205
200
195
190
185
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
FEEDBACK VOLTAGE (V)
VIN = 12V
1.238
1.236
1.234
1.232
1.230
1.228
1.226
1.224
Feedback Voltage
vs. Temperature
FREQUENCY (KHz)
203
201
199
197
195
0
I
OUT
= 100mA
Amb = 25°C
5 10 15 20 25 30 35
INPUT VOLTAGE (V)
V
IN
= 12V
1.222
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
MIC4681 3.3V Output
Efficiency
80
12Vin
24Vin
6Vin
EFFICIENCY (%)
100
80
60
40
20
Amb = 25°C
0
0
0.5
1
1.5
2
OUTPUT CURRENT (A)
2.5
0
0
5V Output Efficiency
100
12V Output Efficiency
15Vin
24Vin
60
40
20
12Vin
7Vin
24Vin
EFFICIENCY (%)
EFFICIENCY (%)
60
80
40
20
Amb = 25°C
0.5
1.0
1.5
2.0
OUTPUT CURRENT (A)
0
0
Amb = 25°C
0.5
1
OUTPUT CURRENT (A)
1.5
February 2001
5
MIC4681
MICREL [ MICREL SEMICONDUCTOR ]
