MP1474 – SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
(continued)
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.
Startup through Enable
I
OUT
=2A
Shutdown through
Enable
I
OUT
=0A
Shutdown through
Enable
I
OUT
=2A
V
OUT
2V/div.
V
PG
5V/div.
V
EN
5V/div.
V
SW
10V/div.
I
INDUCTOR
2A/div.
V
OUT
2V/div.
V
PG
5V/div.
V
EN
5V/div.
V
SW
10V/div.
I
INDUCTOR
2A/div.
V
OUT
2V/div.
V
PG
5V/div.
V
EN
5V/div.
V
SW
10V/div.
I
INDUCTOR
2A/div.
Startup through Input
Voltage
I
OUT
=0A
Startup through Input
Voltage
I
OUT
=2A
Shutdown through
Input Voltage
I
OUT
=0A
V
OUT
2V/div.
V
PG
5V/div.
V
IN
5V/div.
V
SW
5V/div.
I
INDUCTOR
2A/div.
V
OUT
2V/div.
V
PG
5V/div.
V
IN
5V/div.
V
SW
5V/div.
I
INDUCTOR
2A/div.
V
OUT
2V/div.
V
PG
5V/div.
V
IN
5V/div.
V
SW
5V/div.
I
INDUCTOR
2A/div.
Shutdown through
Input Voltage
I
OUT
=2A
Input / Output Ripple
I
OUT
=2A
Load Transient Reponse
I
OUT
=1A-2A
V
OUT
2V/div.
V
PG
5V/div.
V
IN
5V/div.
V
SW
5V/div.
I
INDUCTOR
2A/div.
V
OUT
/AC
20mV/div.
V
IN/
AC
200mV/div.
V
OUT
/AC
50mV/div.
V
SW
10V/div.
I
L
2A/div.
I
OUT
1A/div.
MP1474 Rev. 1.0
9/26/2012
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6
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