TM
MP2359 – 1.2A, 24V, 1.4MHz STEP-DOWN CONVERTER IN A TSOT23-6
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7µH, C1 = 10µF, C2 = 22µF, TA = +25ºC, unless otherwise noted.
Current Limit vs
Duty Cycle
Steady State Test
I
= 0.5A
OUT
3.0
2.5
2.0
1.5
1.0
0.5
0
V
OUT
V
20mV/div.
OUT
AC Coupled
50mV/div.
V
SW
I
10V/div.
L
1A/div.
I
L
500mA/div.
I
LOAD
1A/div.
400ns/div.
0
20
40
60
80
100
DUTY CYCLE (%)
Short Circuit Entry
Short Circuit Recovery
Start-up through Enable
No Load
V
EN
5V/div.
V
OUT
V
OUT
1V/div.
1V/div.
V
OUT
1V/div.
V
SW
10V/div.
I
L
I
I
L
1A/div.
L
1A/div.
500mA/div.
Shut-down through Enable
Start-up through Enable
Shut-down through Enable
No Load
I
= 1A Resistive Load
I
= 1A Resistive Load
OUT
OUT
V
V
EN
EN
V
EN
5V/div.
5V/div.
5V/div.
V
OUT
2V/div.
V
V
OUT
OUT
1V/div.
2V/div.
V
SW
V
SW
V
10V/div.
SW
10V/div.
10V/div.
I
I
L
L
I
L
1A/div.
1A/div.
1A/div.
MP2359 Rev. 1.1
6/23/2006
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4
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