MP1494 – SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN = 12V, VOUT = 3.3V, AAM=0.5V, TA = 25°C, unless otherwise noted.
Startup through
Input Voltage
Shutdown through
Input Voltage
I
= 0A
I
=0A
OUT
OUT
V
V
IN
IN
V
/AC
5V/div.
5V/div.
OUT
50mV/div.
V
V
OUT
OUT
2V/div.
2V/div.
V
V
SW
SW
5V/div.
5V/div.
I
I
I
OUT
INDUCTOR
INDUCTOR
1A/div.
2A/div.
2A/div.
Startup through
Input Voltage
Shutdown through
Input Voltage
Startup through Enable
I
= 0A
OUT
I
= 2A
I
= 2A
OUT
OUT
V
EN
5V/div.
V
V
IN
IN
V
5V/div.
5V/div.
OUT
2V/div.
V
V
OUT
2V/div.
OUT
2V/div.
V
V
SW
SW
V
SW
5V/div.
5V/div.
5V/div.
INDUCTOR
2A/div.
I
I
I
INDUCTOR
2A/div.
INDUCTOR
2A/div.
Shuthdown through Enable
Startup through Enable
Shutdown through Enable
I
= 0A
I
= 2A
I
= 2A
OUT
OUT
OUT
V
EN
V
V
EN
EN
5V/div.
5V/div.
5V/div.
V
V
V
OUT
OUT
OUT
2V/div.
2V/div.
2V/div.
V
V
V
SW
SW
SW
5V/div.
5V/div.
5V/div.
I
INDUCTOR
2A/div.
I
I
INDUCTOR
2A/div.
INDUCTOR
2A/div.
MP1494 Rev. 1.04
12/26/2012
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5
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