MP1474 – SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
Performance waveforms are tested on the evaluation board of the Design Example section.
V
IN
= 12V, V
OUT
= 3.3V, L=5.5μH, T
A
= 25°C, unless otherwise noted.
100
95
90
85
80
75
70
65
60
55
50
0.0
0.4
0.8
1.2
1.6
2.0
V
IN
=12V
V
IN
=16V
V
IN
=5V
100
95
90
85
80
75
70
65
60
55
50
0.0
0.4
0.8
1.2
1.6
2.0
V
IN
=12V
V
IN
=16V
V
IN
=5V
100
95
90
85
80
75
70
65
60
55
50
0.0
0.4
0.8
1.2
1.6
2.0
V
IN
=16V
V
IN
=12V
V
IN
=5V
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Case Temperature Rise
vs. Output Current
100
95
90
85
80
75
70
65
60
55
50
0.0
0.4
0.8
1.2
1.6
OUTPUT CURRENT (A)
2.0
V
IN
=12V
V
IN
=16V
V
IN
=5V
100
95
90
85
80
75
70
65
60
55
50
0.0
0.4
0.8
1.2
1.6
OUTPUT CURRENT (A)
2.0
V
IN
=16V
V
IN
=12V
V
IN
=7V
15
12
9
6
3
0
0
0.5
1
1.5
OUTPUT CURRENT (A)
2
18
I
OUT
=0A-2A
Short Entry
I
OUT
=0A
Short Recovery
I
OUT
=0A
Startup through Enable
I
OUT
=0A
V
OUT
2V/div.
V
PG
5V/div.
V
IN
10V/div.
V
SW
10V/div.
I
INDUCTOR
5A/div.
V
OUT
2V/div.
V
PG
5V/div.
V
IN
10V/div.
V
SW
10V/div.
I
INDUCTOR
5A/div.
V
OUT
2V/div.
V
PG
5V/div.
V
EN
5V/div.
V
SW
10V/div.
I
INDUCTOR
2A/div.
MP1474 Rev. 1.0
9/26/2012
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5
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