MIC24420 Datasheet, PDF (6/34 Pages) Micrel Semiconductor – 2.5A Dual Output PWM Synchronous Buck Regulator IC

Micrel, Inc.
Typical Characteristics
UVLO vs Temperature
4.25
4.2
4.15
UVLO rising
4.1
4.05
4
UVLO falling
3.95
3.9
3.85
-60 -40 -20
0 20 40 60 80 100 120 140
Temperature (°C)
MIC24420/MIC24421
Operating Current vs Input
Voltage (O/P regulating)
45
40
MIC24420
35
30
25
20
15
MIC24421
10
5
V_OUT1/2 = 1.2V/3.3V
No Load
0
4
6
8
10
12
14
16
Input Voltage (V)
Enable and Switching Start
Thresholds vs. V_IN
1.6
1.4
1.2
SW on
1
V_DD on
0.8
0.6
0.4
V_DD off
0.2
0
4
6
8
10
12
14
16
V_IN (V)
Current Limit trip Voltage vs
T emperature
10
5
0
-5
-10
-15
V_IN = 12V
-20
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0
Efficiency vs. Load
V_IN = 5V
V_OUT = 0.7V
V_OUT = 1.2V
V_OUT = 3.3V
V_IN = 5V
0.5
1
1.5
2
2.5
OUTPUT CURRENT (A)
Regulation vs. Input Voltage
3.4
3.38
3.36
3.34
3.32
3.3
3.28
3.26
3.24
3.22
V_OUT = 3.3V
3.2
5
7
9
11
13
15
INPUT VOLTABE (V)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0
Efficiency vs. Load
V_IN = 12V
V_OUT = 3.3V
V_OUT = 0.7V
V_OUT = 1.2V
V_OUT = 5V
V_IN = 12V
0.5
1
1.5
2
2.5
OUTPUT CURRENT (A)
3.40
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
0
Regulation vs. Load
V_IN = 12V
V_OUT = 3.3V
V_IN = 12V
0.5
1
1.5
2
OUTPUT CURRENT (A)
Current Sense Source Current
vs Temperature
225
215
205
195
185
175
V_IN = 12V
165
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
June 2012
6
M9999-062012-C