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MP2355 – 3A, 23V, 380KHz STEP-DOWN CONVERTER
MP2355 Rev. 1.5
5/1/2006
www.MonolithicPower.com
3
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
ELECTRICAL CHARACTERISTICS
(continued)
V
IN
= 12V, T
A
= +25
°
C, unless otherwise noted.
Parameter
Symbol Condition
Enable Pull Up Current
EN UVLO Threshold
EN UVLO Threshold
Hysteresis
Soft-Start Period
Thermal Shutdown
Min
1.1
2.37
Typ
1.8
2.54
Max
2.5
2.71
Units
μA
V
V
RUN
= 0V
V
EN
Rising
210
mV
C
SS
= 0.1μF
10
150
ms
°
C
Note:
4) Equivalent output current = 1.5A
≥
50% Duty Cycle
Assumes ripple current = 30% of load current.
Slope compensation changes current limit above 40% duty cycle.
2.0A
≤
50% Duty Cycle
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit of Figure 2, V
IN
= 12V, V
O
= 3.3V, L1 = 15μH, C1 = 10μF, C2 = 22μF, T
A
= +25
°
C, unless
otherwise noted.
V
SW
10V/div.
V
IN, AC
200mV/div.
V
O, AC
20mV/div.
I
L
1A/div.
V
SW
10V/div.
V
IN, AC
20mV/div.
V
O, AC
20mV/div.
I
L
1A/div.
MP2355-TPC01
Heavy Load
Operation
3A Load
MP2355-TPC02
Light Load
Operation
No Load
V
EN
5V/div.
V
OUT
1V/div.
I
L
1A/div.
MP2355-TPC03
Startup from Shutdown
No C4
3A Resistive Load
V
EN
5V/div.
V
OUT
1V/div.
I
L
1A/div.
Startup from Shutdown
C4
= 10nF
3A Resistive Load
V
EN
5V/div.
V
OUT
1V/div.
I
L
1A/div.
Startup from Shutdown
C4
= 10nF
No Load
MP2355-TPC04
MP2355-TPC05
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